Compare Gemini 3.1 Pro and Grok 4.3: Multimodal Powerhouse vs High-Speed Scale
Gemini 3.1 Pro vs Grok 4.3: which should I use?
Gemini 3.1 Pro leads in multimodal intelligence with native audio/video understanding and 2M context, whereas Grok 4.3 excels at rapid text generation, real-time data access, and 1M context. Verified 2026-09-07.
Verified 2026-09-07
Where can you find price, speed, and task evidence for Gemini 3.1 Pro and Grok 4.3?
Which tasks fit Gemini 3.1 Pro and Grok 4.3?
Best-fit task signals from the published model strengths; this is not a substitute for a controlled benchmark.
| Fact | Gemini 3.1 Pro | Grok 4.3 |
|---|---|---|
| Best fit | Whole-codebase, whole-document, or long-video analysis in a single request. | General-purpose work where speed and a huge context window both matter. |
| Reasoning mode | Available | Available |
What does a Coding Agent workload cost with Gemini 3.1 Pro and Grok 4.3?
Modeled for Coding Agent: 20,000 input + 2,000 output tokens per task, 1 turn. This is a workload model, not a provider quote.
| Fact | Gemini 3.1 Pro | Grok 4.3 |
|---|---|---|
| Coding Agent / task | $0.06 (modeled) | $0.03 (modeled) (winner) |
| Input / output rate | $2.00 / $12.00 per M | $1.25 / $2.50 per M |
How fast are Gemini 3.1 Pro and Grok 4.3?
Only non-estimated benchmark results are shown as measured.
| Fact | Gemini 3.1 Pro | Grok 4.3 |
|---|---|---|
| Measured throughput | 55 tokens/s | 98 tokens/s (winner) |
| Time to first token | 420 ms | 320 ms |
How compatible are Gemini 3.1 Pro and Grok 4.3 with APIs?
Provider-level wire-format and SDK facts; model-specific parameter differences may still apply.
| Fact | Gemini 3.1 Pro | Grok 4.3 |
|---|---|---|
| OpenAI SDK | Not drop-in | Usable |
| Request shape | contents/parts structure instead of messages; an OpenAI-compatible endpoint exists but only covers a subset of parameters. | Full OpenAI chat/completions compatibility — point the openai SDK at api.x.ai and it works unmodified. |
| Streaming | SSE (Gemini streamGenerateContent) | SSE (OpenAI delta) |
What are the privacy and retention policies for Gemini 3.1 Pro and Grok 4.3?
Provider policy and residency facts from the verified provider registry. A missing retention policy is not treated as a guarantee.
| Fact | Gemini 3.1 Pro | Grok 4.3 |
|---|---|---|
| Provider says API data trains models | No | Unavailable |
| Published retention period | Unavailable | Unavailable |
| Data residency | Global by default; Vertex AI offers selectable regional endpoints | Unavailable |
How much effort does it take to migrate between Gemini 3.1 Pro and Grok 4.3?
Direction is from each displayed model to the other. Effort is derived from provider compatibility and published parameter maps.
| Fact | Gemini 3.1 Pro | Grok 4.3 |
|---|---|---|
| Move Gemini 3.1 Pro → Grok 4.3 | config; 2 breaking parameter differences | Target: Grok 4.3 |
| Move Grok 4.3 → Gemini 3.1 Pro | Source: Grok 4.3 | code-change; 1 breaking parameter difference |
| Why | Keep the `openai` SDK; change `baseURL` and the API key. | contents/parts structure instead of messages; an OpenAI-compatible endpoint exists but only covers a subset of parameters. |
Exact-pair decision guide. Verified 2026-09-02. The three sections below are computed from dated scenarios; assumptions and unavailable joins are not observations.
Exact pair boundary: Google / xAI; base/variant hashes, semantic-equivalence review, exact settings, evidence sources, and evaluator denominator must join. Requested models are gemini-3.1-pro and grok-4.3. Provider, rate, pricing, and task pages remain fact owners.
Meaning-preserving framing perturbation register
Frozen scenario board. Formula / deterministic rule: admit = base/variant hashes + equivalence reviewer/version + expected invariant fields; non-equivalent paraphrase => reject Boundary: Owns controlled framing admission for this exact pair, not general prompt quality or safety.
| Frozen scenario | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
| neutral wording | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=neutral wording; base/variant hashes; semantic-equivalence reviewer/version; exact IDs/settings; expected invariants; admitted/rejected/unknown state; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — neutral wording is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| leading wording | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=leading wording; base/variant hashes; semantic-equivalence reviewer/version; exact IDs/settings; expected invariants; admitted/rejected/unknown state; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — leading wording is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| asserted expert opinion | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=asserted expert opinion; base/variant hashes; semantic-equivalence reviewer/version; exact IDs/settings; expected invariants; admitted/rejected/unknown state; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — asserted expert opinion is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| user-preference pressure | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=user-preference pressure; base/variant hashes; semantic-equivalence reviewer/version; exact IDs/settings; expected invariants; admitted/rejected/unknown state; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — user-preference pressure is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| reversed option order | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=reversed option order; base/variant hashes; semantic-equivalence reviewer/version; exact IDs/settings; expected invariants; admitted/rejected/unknown state; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — reversed option order is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| non-equivalent paraphrase | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=non-equivalent paraphrase; base/variant hashes; semantic-equivalence reviewer/version; exact IDs/settings; expected invariants; admitted/rejected/unknown state; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — non-equivalent paraphrase is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
First-party provenance: Google Gemini API model documentation; verification date 2026-09-02. Missing or conflicting joins fail closed.
Pair-specific answer-consistency receipt
Frozen scenario board. Formula / deterministic rule: consistency = invariant fields preserved across admitted variants / evaluated variants; absent raw response or denominator => Untested Boundary: Owns framing consistency evidence for Gemini Pro versus Grok 4.3; no factuality claim follows from stability alone.
| Frozen scenario | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
| stable conclusion | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=stable conclusion; prompt/result/source hashes; exact routes/controls; extraction rule; evaluator lineage; denominator; per-variant result or Untested; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — stable conclusion is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| justified update | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=justified update; prompt/result/source hashes; exact routes/controls; extraction rule; evaluator lineage; denominator; per-variant result or Untested; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — justified update is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| unsupported reversal | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=unsupported reversal; prompt/result/source hashes; exact routes/controls; extraction rule; evaluator lineage; denominator; per-variant result or Untested; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — unsupported reversal has no matched, dated bilateral observation. | FAIL CLOSED — manual, probe, or source evidence required |
| citation drift | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=citation drift; prompt/result/source hashes; exact routes/controls; extraction rule; evaluator lineage; denominator; per-variant result or Untested; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — citation drift has no matched, dated bilateral observation. | FAIL CLOSED — manual, probe, or source evidence required |
| confidence inflation | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=confidence inflation; prompt/result/source hashes; exact routes/controls; extraction rule; evaluator lineage; denominator; per-variant result or Untested; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — confidence inflation is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| missing raw response | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=missing raw response; prompt/result/source hashes; exact routes/controls; extraction rule; evaluator lineage; denominator; per-variant result or Untested; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — missing raw response has no matched, dated bilateral observation. | FAIL CLOSED — manual, probe, or source evidence required |
First-party provenance: xAI model documentation; verification date 2026-09-02. Missing or conflicting joins fail closed.
Framing-contradiction release board
Frozen scenario board. Formula / deterministic rule: release = support coverage + severity + neutral review; unresolved high-impact contradiction => hold or retry Boundary: Owns contradiction triage and release boundaries for framing experiments only.
| Frozen scenario | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
| both stable | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=both stable; support coverage; severity; neutral human-review requirement; release/retry/hold rule; attempt cap; no safety verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — both stable is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| Gemini-only reversal | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=Gemini-only reversal; support coverage; severity; neutral human-review requirement; release/retry/hold rule; attempt cap; no safety verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — Gemini-only reversal is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| Grok-only reversal | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=Grok-only reversal; support coverage; severity; neutral human-review requirement; release/retry/hold rule; attempt cap; no safety verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — Grok-only reversal is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| both reverse | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=both reverse; support coverage; severity; neutral human-review requirement; release/retry/hold rule; attempt cap; no safety verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — both reverse is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| evidence-driven update | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=evidence-driven update; support coverage; severity; neutral human-review requirement; release/retry/hold rule; attempt cap; no safety verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — evidence-driven update is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| unresolved judge | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Gemini API; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=unresolved judge; support coverage; severity; neutral human-review requirement; release/retry/hold rule; attempt cap; no safety verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — unresolved judge has no matched, dated bilateral observation. | FAIL CLOSED — manual, probe, or source evidence required |
First-party provenance: Google Gemini API rate limits; verification date 2026-09-02. Missing or conflicting joins fail closed.
Method and limitations: formulas are deterministic; observed and assumed inputs are labeled; no missing provider, host, account, region, realm, alias, snapshot, revision, weight, artifact, control, tool, modality, workload, rate-period, timestamp, or result is transferred. Run this scenario →
Exact-pair decision guide · verified 2026-09-07
Exact pair boundary: Google / xAI; model endpoint, 2M vs 1M context scale, native audio/video vs real-time text streaming, and token tariffs must join. Requested models are gemini-3.1-pro and grok-4.3. Provider, rate, pricing, and task pages remain fact owners.
Context window (2M vs 1M) and multimodal admissibility gate
Frozen scenario board. Formula / deterministic rule: admissible = (audio_or_video ? Gemini : Both) && (context <= 1M ? Both : (context <= 2M ? Gemini : Excluded)) Boundary: Owns capability gating for multimodal and long-context workloads.
| Frozen scenario | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
| text & image prompt (500K context) | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=text & image prompt (500K context); workload modality; input context; video/audio required; Gemini eligible; Grok eligible; routing verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — text & image prompt (500K context) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| video stream analysis (1M context) | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=video stream analysis (1M context); workload modality; input context; video/audio required; Gemini eligible; Grok eligible; routing verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — video stream analysis (1M context) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| extreme text prompt (1.5M context) | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=extreme text prompt (1.5M context); workload modality; input context; video/audio required; Gemini eligible; Grok eligible; routing verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — extreme text prompt (1.5M context) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| multimodal audio call (250K context) | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=multimodal audio call (250K context); workload modality; input context; video/audio required; Gemini eligible; Grok eligible; routing verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — multimodal audio call (250K context) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| 2M max context boundary test | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=2M max context boundary test; workload modality; input context; video/audio required; Gemini eligible; Grok eligible; routing verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 2M max context boundary test is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| unsupported media payload format | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=unsupported media payload format; workload modality; input context; video/audio required; Gemini eligible; Grok eligible; routing verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — unsupported media payload format has no matched, dated bilateral observation. | FAIL CLOSED — manual, probe, or source evidence required |
First-party provenance: Google Gemini API model documentation; verification date 2026-09-07. Missing or conflicting joins fail closed.
Sequential execution throughput and streaming latency board
Frozen scenario board. Formula / deterministic rule: elapsed_time = ttft + (output_tokens / tps); Grok high throughput vs Gemini multimodal reasoning Boundary: Owns turnaround time and throughput modeling for interactive workflows.
| Frozen scenario | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
| interactive short question (500 tokens) | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=interactive short question (500 tokens); output tokens; Gemini elapsed time; Grok 4.3 elapsed time; latency ratio; UX responsiveness verdict; throughput champion; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — interactive short question (500 tokens) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| deep analytical response (4K tokens) | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=deep analytical response (4K tokens); output tokens; Gemini elapsed time; Grok 4.3 elapsed time; latency ratio; UX responsiveness verdict; throughput champion; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — deep analytical response (4K tokens) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| extended code generation (16K tokens) | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=extended code generation (16K tokens); output tokens; Gemini elapsed time; Grok 4.3 elapsed time; latency ratio; UX responsiveness verdict; throughput champion; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — extended code generation (16K tokens) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| batch classification sequence (50 calls) | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=batch classification sequence (50 calls); output tokens; Gemini elapsed time; Grok 4.3 elapsed time; latency ratio; UX responsiveness verdict; throughput champion; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — batch classification sequence (50 calls) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| concurrency contention latency spike | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=concurrency contention latency spike; output tokens; Gemini elapsed time; Grok 4.3 elapsed time; latency ratio; UX responsiveness verdict; throughput champion; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — concurrency contention latency spike is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| unmeasured speed fixture | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=unmeasured speed fixture; output tokens; Gemini elapsed time; Grok 4.3 elapsed time; latency ratio; UX responsiveness verdict; throughput champion; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — unmeasured speed fixture is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
First-party provenance: All AI Ask measured speed dataset; verification date 2026-09-07. Missing or conflicting joins fail closed.
Token pricing and context caching financial break-even
Frozen scenario board. Formula / deterministic rule: net_spend = (uncached_in * rate_in + cached_in * cache_rate + out * rate_out) / 1M Boundary: Owns unit token economics and caching ROI between Gemini and Grok.
| Frozen scenario | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
| uncached single call workload | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=uncached single call workload; workload; prompt tokens; cache hit rate; Gemini spend; Grok spend; net cost difference; pricing winner; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — uncached single call workload is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| cached 500K document with 10 queries/hr | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=cached 500K document with 10 queries/hr; workload; prompt tokens; cache hit rate; Gemini spend; Grok spend; net cost difference; pricing winner; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — cached 500K document with 10 queries/hr is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| cached 1M document with 50 queries/hr | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=cached 1M document with 50 queries/hr; workload; prompt tokens; cache hit rate; Gemini spend; Grok spend; net cost difference; pricing winner; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — cached 1M document with 50 queries/hr is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| high-frequency interactive coding loop | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=high-frequency interactive coding loop; workload; prompt tokens; cache hit rate; Gemini spend; Grok spend; net cost difference; pricing winner; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — high-frequency interactive coding loop is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| stale cache storage without queries | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=stale cache storage without queries; workload; prompt tokens; cache hit rate; Gemini spend; Grok spend; net cost difference; pricing winner; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — stale cache storage without queries is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
| unresolved billing plan | pair=gemini-3.1-pro vs grok-4.3; provider=Google / xAI; hostA=generativelanguage.googleapis.com; hostB=api.x.ai; surfaceA=Google AI Studio / Vertex AI; surfaceB=xAI API; requested/effective IDs=gemini-3.1-pro,grok-4.3; scenario=unresolved billing plan; workload; prompt tokens; cache hit rate; Gemini spend; Grok spend; net cost difference; pricing winner; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — unresolved billing plan has no matched, dated bilateral observation. | FAIL CLOSED — manual, probe, or source evidence required |
First-party provenance: Google Gemini API pricing; verification date 2026-09-07. Missing or conflicting joins fail closed.
Method and limitations: formulas are deterministic; observed and assumed inputs are labeled; no missing provider, host, account, region, realm, alias, snapshot, revision, weight, artifact, control, tool, modality, workload, rate-period, timestamp, or result is transferred. Run this scenario →
How do Gemini 3.1 Pro and Grok 4.3 compare on specs?
| Gemini 3.1 Pro | Grok 4.3 | |
|---|---|---|
| Price (input) | $2.00/M | $1.25/M ✓ |
| Price (output) | $12.00/M | $2.50/M ✓ |
| Blended price | $4.50/M | $1.56/M ✓ |
| Context window | 2,000,000 tokens ✓ | 1,000,000 tokens |
| Max output | 64,000 tokens | 64,000 tokens |
| Modalities | text, vision, audio | text, vision |
| Reasoning mode | Yes | Yes |
| Released | 2026-02 | 2026-06 |
| Speed | 55 t/s | 98 t/s ✓ |
How much do Gemini 3.1 Pro and Grok 4.3 cost at scale?
| Tokens / month | Gemini 3.1 Pro | Grok 4.3 | Delta |
|---|---|---|---|
| 1,000,000 | $4.50 | $1.56 | $2.94 (2.9×) |
| 10,000,000 | $45.00 | $15.63 | $29.38 (2.9×) |
| 100,000,000 | $450.00 | $156.25 | $293.75 (2.9×) |
Choose Gemini 3.1 Pro if…
- ✓Largest context window of any current model (2M tokens)
- ✓Native audio and video understanding
- ✓Google Search grounding
- ✓Whole-codebase, whole-document, or long-video analysis in a single request.
Choose Grok 4.3 if…
- ✓xAI’s general-purpose flagship
- ✓Extremely fast for its size
- ✓1M-token context
- ✓General-purpose work where speed and a huge context window both matter.
Run this exact matchup right now
Send the same prompt to Gemini 3.1 Pro and Grok 4.3 side by side and see the outputs yourself.
Try Gemini 3.1 Pro vs Grok 4.3 FreeWhat are common questions about Gemini 3.1 Pro and Grok 4.3?
Is Gemini 3.1 Pro cheaper than Grok 4.3?
Grok 4.3 is cheaper, at $1.56 per million blended tokens vs $4.50 for Gemini 3.1 Pro.
Which has the bigger context window, Gemini 3.1 Pro or Grok 4.3?
Gemini 3.1 Pro has the larger context window: 2,000,000 tokens vs 1,000,000.
Can Gemini 3.1 Pro replace Grok 4.3 for coding?
Both are viable for coding. Largest context window of any current model (2M tokens) (Gemini 3.1 Pro) vs xAI’s general-purpose flagship (Grok 4.3) — pick based on which strength matters more for your workload.
Which is faster, Gemini 3.1 Pro or Grok 4.3?
Grok 4.3 is faster: 98 t/s vs 55 t/s, measured on our speed benchmarks.
Neither of these? See Gemini 3.1 Pro alternatives or Grok 4.3 alternatives.
What related comparisons help choose between Gemini 3.1 Pro and Grok 4.3?
Gemini 3.1 Pro pricingGrok 4.3 pricingvs Claude Opus 4.8vs Claude Opus 5.5vs Claude Sonnet 5vs DeepSeek V4 ProPremium model tests
Pricing verified 2026-04-06. Specs verified 2026-08-14.