Compare Gemini 3.1 Pro and Grok 4.5: 2M Context, Multimodal Ingestion & Coding Agents
Gemini 3.1 Pro vs Grok 4.5: which should I use?
Gemini 3.1 Pro and Grok 4.5 both offer massive 2M token context windows. Gemini 3.1 Pro leads in native audio/video processing and context caching, while Grok 4.5 delivers deep coding agent tool loop reasoning. Verified 2026-09-07.
Verified 2026-09-07
Where can you find price, speed, and task evidence for Gemini 3.1 Pro and Grok 4.5?
Which tasks fit Gemini 3.1 Pro and Grok 4.5?
Best-fit task signals from the published model strengths; this is not a substitute for a controlled benchmark.
| Fact | Gemini 3.1 Pro | Grok 4.5 |
|---|---|---|
| Best fit | Whole-codebase, whole-document, or long-video analysis in a single request. | Agentic software engineering and workflow automation that need strong coding capability at a competitive price. |
| Reasoning mode | Available | Available |
What does a Coding Agent workload cost with Gemini 3.1 Pro and Grok 4.5?
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 4.5 |
|---|---|---|
| Coding Agent / task | $0.06 (modeled) | $0.05 (modeled) (winner) |
| Input / output rate | $2.00 / $12.00 per M | $2.00 / $6.00 per M |
How fast are Gemini 3.1 Pro and Grok 4.5?
Only non-estimated benchmark results are shown as measured.
| Fact | Gemini 3.1 Pro | Grok 4.5 |
|---|---|---|
| Measured throughput | 55 tokens/s | Unavailable |
| Time to first token | 420 ms | Unavailable |
How compatible are Gemini 3.1 Pro and Grok 4.5 with APIs?
Provider-level wire-format and SDK facts; model-specific parameter differences may still apply.
| Fact | Gemini 3.1 Pro | Grok 4.5 |
|---|---|---|
| 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 4.5?
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 4.5 |
|---|---|---|
| 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 4.5?
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 4.5 |
|---|---|---|
| Move Gemini 3.1 Pro → Grok 4.5 | config; 2 breaking parameter differences | Target: Grok 4.5 |
| Move Grok 4.5 → Gemini 3.1 Pro | Source: Grok 4.5 | 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. |
Batch 56 · exact-pair decision contributions. Surface verification: 2026-09-02. Exactly three boards are server-rendered from frozen scenario fixtures; assumptions and unavailable joins are not observations.
Exact pair boundary: Google / xAI; fixture hash, transform chain, exact model/host, coordinate convention, and review lineage must join. Requested models are gemini-3.1-pro and grok-4.5. Provider, rate, pricing, and task pages remain fact owners.
Pair-specific visual-inspection fixture register
Frozen Batch 56 scenario board. Formula / deterministic rule: admit = artifact hash + dimension/orientation chain + exact endpoint + taxonomy/coordinates; lossy or unsupported input => conditional or blocked Boundary: Owns exact-pair visual fixture admission, not a general multimodal winner or modality ranking.
| Frozen scenario / field ID | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
batch56-gemini-3-1-pro-vs-grok-4-5-m1-r1UI screenshot | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=UI screenshot; artifact/hash; source dimensions; transform/crop/orientation chain; exact IDs/hosts/settings; taxonomy; coordinate convention; equivalent/conditional/blocked state; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — UI screenshot is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-gemini-3-1-pro-vs-grok-4-5-m1-r2manufactured part | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=manufactured part; artifact/hash; source dimensions; transform/crop/orientation chain; exact IDs/hosts/settings; taxonomy; coordinate convention; equivalent/conditional/blocked state; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — manufactured part is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-gemini-3-1-pro-vs-grok-4-5-m1-r3chart anomaly | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=chart anomaly; artifact/hash; source dimensions; transform/crop/orientation chain; exact IDs/hosts/settings; taxonomy; coordinate convention; equivalent/conditional/blocked state; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — chart anomaly is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-gemini-3-1-pro-vs-grok-4-5-m1-r4scanned form | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=scanned form; artifact/hash; source dimensions; transform/crop/orientation chain; exact IDs/hosts/settings; taxonomy; coordinate convention; equivalent/conditional/blocked state; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — scanned form is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-gemini-3-1-pro-vs-grok-4-5-m1-r5multi-panel image | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=multi-panel image; artifact/hash; source dimensions; transform/crop/orientation chain; exact IDs/hosts/settings; taxonomy; coordinate convention; equivalent/conditional/blocked state; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — multi-panel image is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-gemini-3-1-pro-vs-grok-4-5-m1-r6unsupported image detail | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=unsupported image detail; artifact/hash; source dimensions; transform/crop/orientation chain; exact IDs/hosts/settings; taxonomy; coordinate convention; equivalent/conditional/blocked state; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — unsupported image detail has no matched, dated bilateral observation. | FAIL CLOSED — manual, probe, or source evidence required |
First-party provenance: Google Gemini API model documentation; verification date 2026-09-02. Missing or conflicting joins fail closed.
Coordinate-grounded defect evidence receipt
Frozen Batch 56 scenario board. Formula / deterministic rule: region_match = class + severity + IoU threshold + support evidence / annotated regions; no ground truth => Untested Boundary: Owns region-level defect evidence for this pair, not whole-image fluency or broad vision quality.
| Frozen scenario / field ID | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
batch56-gemini-3-1-pro-vs-grok-4-5-m2-r1missing control | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=missing control; fixture/annotation/result hashes; schema/validator versions; exact IDs/settings; region rule; class/severity/support; denominator; observation or Untested; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — missing control has no matched, dated bilateral observation. | FAIL CLOSED — manual, probe, or source evidence required |
batch56-gemini-3-1-pro-vs-grok-4-5-m2-r2surface crack | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=surface crack; fixture/annotation/result hashes; schema/validator versions; exact IDs/settings; region rule; class/severity/support; denominator; observation or Untested; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — surface crack is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-gemini-3-1-pro-vs-grok-4-5-m2-r3mislabeled axis | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=mislabeled axis; fixture/annotation/result hashes; schema/validator versions; exact IDs/settings; region rule; class/severity/support; denominator; observation or Untested; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — mislabeled axis is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-gemini-3-1-pro-vs-grok-4-5-m2-r4OCR-field mismatch | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=OCR-field mismatch; fixture/annotation/result hashes; schema/validator versions; exact IDs/settings; region rule; class/severity/support; denominator; observation or Untested; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — OCR-field mismatch has no matched, dated bilateral observation. | FAIL CLOSED — manual, probe, or source evidence required |
batch56-gemini-3-1-pro-vs-grok-4-5-m2-r5overlapping regions | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=overlapping regions; fixture/annotation/result hashes; schema/validator versions; exact IDs/settings; region rule; class/severity/support; denominator; observation or Untested; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — overlapping regions is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-gemini-3-1-pro-vs-grok-4-5-m2-r6no ground truth | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=no ground truth; fixture/annotation/result hashes; schema/validator versions; exact IDs/settings; region rule; class/severity/support; denominator; observation or Untested; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — no ground truth is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
First-party provenance: xAI model documentation; verification date 2026-09-02. Missing or conflicting joins fail closed.
Severity-weighted inspection release board
Frozen Batch 56 scenario board. Formula / deterministic rule: release = coverage + reviewer signoff + severity rule; unresolved high-severity cell => block automated release Boundary: Owns severity-aware release containment for visual inspection only; it does not certify safety or reliability.
| Frozen scenario / field ID | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
batch56-gemini-3-1-pro-vs-grok-4-5-m3-r1no defect | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=no defect; evidence coverage; false-negative cost assumption; reviewer role; release/inspect/block rule; fallback path; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — no defect is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-gemini-3-1-pro-vs-grok-4-5-m3-r2low-severity agreement | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=low-severity agreement; evidence coverage; false-negative cost assumption; reviewer role; release/inspect/block rule; fallback path; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — low-severity agreement is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-gemini-3-1-pro-vs-grok-4-5-m3-r3high-severity agreement | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=high-severity agreement; evidence coverage; false-negative cost assumption; reviewer role; release/inspect/block rule; fallback path; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — high-severity agreement is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-gemini-3-1-pro-vs-grok-4-5-m3-r4location disagreement | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=location disagreement; evidence coverage; false-negative cost assumption; reviewer role; release/inspect/block rule; fallback path; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — location disagreement is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-gemini-3-1-pro-vs-grok-4-5-m3-r5class disagreement | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=class disagreement; evidence coverage; false-negative cost assumption; reviewer role; release/inspect/block rule; fallback path; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — class disagreement is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch56-gemini-3-1-pro-vs-grok-4-5-m3-r6both unsupported | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=both unsupported; evidence coverage; false-negative cost assumption; reviewer role; release/inspect/block rule; fallback path; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-02; measurement versus assumption=explicit | Unavailable — both unsupported 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 the gemini-3-1-pro-vs-grok-4-5 Batch 56 scenario →
Batch 63 · exact-pair decision contributions · verified 2026-09-07
Exact pair boundary: Google / xAI; model endpoint, 2M context parity, native multimodal vs coding agent reasoning, and token tariffs must join. Requested models are gemini-3.1-pro and grok-4.5. Provider, rate, pricing, and task pages remain fact owners.
Equal-2M-context window and multimodal admissibility gate
Frozen Batch 63 scenario board. Formula / deterministic rule: admissible = (audio_or_video ? Gemini : Both) && (context <= 2M ? Both : Excluded) Boundary: Owns capability gating for 2M context workloads.
| Frozen scenario / field ID | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
batch63-gemini-3-1-pro-vs-grok-4-5-m1-r1text & image analysis (500K context) | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=text & image analysis (500K context); workload modality; input tokens; video/audio required; Gemini fit; Grok fit; workload gate decision; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — text & image analysis (500K context) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch63-gemini-3-1-pro-vs-grok-4-5-m1-r2video stream analysis (1M context) | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=video stream analysis (1M context); workload modality; input tokens; video/audio required; Gemini fit; Grok fit; workload gate decision; 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 |
batch63-gemini-3-1-pro-vs-grok-4-5-m1-r3full 2M context document corpus | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=full 2M context document corpus; workload modality; input tokens; video/audio required; Gemini fit; Grok fit; workload gate decision; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — full 2M context document corpus is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch63-gemini-3-1-pro-vs-grok-4-5-m1-r4audio recording transcription (250K context) | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=audio recording transcription (250K context); workload modality; input tokens; video/audio required; Gemini fit; Grok fit; workload gate decision; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — audio recording transcription (250K context) is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch63-gemini-3-1-pro-vs-grok-4-5-m1-r52M context boundary overflow test | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=2M context boundary overflow test; workload modality; input tokens; video/audio required; Gemini fit; Grok fit; workload gate decision; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — 2M context boundary overflow test has no matched, dated bilateral observation. | FAIL CLOSED — manual, probe, or source evidence required |
batch63-gemini-3-1-pro-vs-grok-4-5-m1-r6unsupported media MIME type | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=unsupported media MIME type; workload modality; input tokens; video/audio required; Gemini fit; Grok fit; workload gate decision; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — unsupported media MIME type 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.
Token pricing and context caching financial break-even
Frozen Batch 63 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 / field ID | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
batch63-gemini-3-1-pro-vs-grok-4-5-m2-r1uncached single call workload | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; 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 |
batch63-gemini-3-1-pro-vs-grok-4-5-m2-r2cached 500K document with 10 queries/hr | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; 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 |
batch63-gemini-3-1-pro-vs-grok-4-5-m2-r3cached 1M document with 50 queries/hr | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; 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 |
batch63-gemini-3-1-pro-vs-grok-4-5-m2-r4high-frequency interactive coding loop | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; 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 |
batch63-gemini-3-1-pro-vs-grok-4-5-m2-r5stale cache storage without queries | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; 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 |
batch63-gemini-3-1-pro-vs-grok-4-5-m2-r6unresolved billing plan | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; 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.
Coding agent tool execution versus general multimodal audit
Frozen Batch 63 scenario board. Formula / deterministic rule: efficiency_roi = coding_defect_reduction - multimodal_cost_premium Boundary: Owns workflow suitability and return-on-investment modeling.
| Frozen scenario / field ID | Pair, identity, host, surface, and evidence fields | Result | State |
|---|---|---|---|
batch63-gemini-3-1-pro-vs-grok-4-5-m3-r1pure software refactoring workflow | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=pure software refactoring workflow; use case; task domain; Gemini suitability; Grok suitability; recommended primary model; architecture verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — pure software refactoring workflow is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch63-gemini-3-1-pro-vs-grok-4-5-m3-r2technical manual OCR + diagram extraction | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=technical manual OCR + diagram extraction; use case; task domain; Gemini suitability; Grok suitability; recommended primary model; architecture verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — technical manual OCR + diagram extraction is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch63-gemini-3-1-pro-vs-grok-4-5-m3-r3automated code review from video demo | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=automated code review from video demo; use case; task domain; Gemini suitability; Grok suitability; recommended primary model; architecture verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — automated code review from video demo is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch63-gemini-3-1-pro-vs-grok-4-5-m3-r4CI/CD pipeline test failure triage | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=CI/CD pipeline test failure triage; use case; task domain; Gemini suitability; Grok suitability; recommended primary model; architecture verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — CI/CD pipeline test failure triage has no matched, dated bilateral observation. | FAIL CLOSED — manual, probe, or source evidence required |
batch63-gemini-3-1-pro-vs-grok-4-5-m3-r5hybrid deployment: Grok coding / Gemini vision | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=hybrid deployment: Grok coding / Gemini vision; use case; task domain; Gemini suitability; Grok suitability; recommended primary model; architecture verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — hybrid deployment: Grok coding / Gemini vision is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
batch63-gemini-3-1-pro-vs-grok-4-5-m3-r6untested tool accuracy delta | pair=gemini-3.1-pro vs grok-4.5; 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-4.5; scenario=untested tool accuracy delta; use case; task domain; Gemini suitability; Grok suitability; recommended primary model; architecture verdict; prompt/config/input/output/result/cache/checkpoint/artifact hashes=required; evidence=2026-09-07; measurement versus assumption=explicit | Unavailable — untested tool accuracy delta is a frozen fixture pending exact identity, configuration, and denominator joins. | UNTESTED — assumption cannot establish a verdict |
First-party provenance: xAI Grok documentation; 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 the gemini-3-1-pro-vs-grok-4-5 Batch 63 scenario →
How do Gemini 3.1 Pro and Grok 4.5 compare on specs?
| Gemini 3.1 Pro | Grok 4.5 | |
|---|---|---|
| Price (input) | $2.00/M | $2.00/M |
| Price (output) | $12.00/M | $6.00/M ✓ |
| Blended price | $4.50/M | $3.00/M ✓ |
| Context window | 2,000,000 tokens ✓ | 500,000 tokens |
| Max output | 64,000 tokens | 64,000 tokens |
| Modalities | text, vision, audio | text, vision |
| Reasoning mode | Yes | Yes |
| Released | 2026-02 | 2026-07 |
| Speed | 55 t/s | Not measured |
How much do Gemini 3.1 Pro and Grok 4.5 cost at scale?
| Tokens / month | Gemini 3.1 Pro | Grok 4.5 | Delta |
|---|---|---|---|
| 1,000,000 | $4.50 | $3.00 | $1.50 (1.5×) |
| 10,000,000 | $45.00 | $30.00 | $15.00 (1.5×) |
| 100,000,000 | $450.00 | $300.00 | $150.00 (1.5×) |
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 4.5 if…
- ✓xAI coding model for agents and engineering
- ✓Configurable reasoning for complex tasks
- ✓500K-token context at $2/$6 per million tokens
- ✓Agentic software engineering and workflow automation that need strong coding capability at a competitive price.
Run this exact matchup right now
Send the same prompt to Gemini 3.1 Pro and Grok 4.5 side by side and see the outputs yourself.
Try Gemini 3.1 Pro vs Grok 4.5 FreeWhat are common questions about Gemini 3.1 Pro and Grok 4.5?
Is Gemini 3.1 Pro cheaper than Grok 4.5?
Grok 4.5 is cheaper, at $3.00 per million blended tokens vs $4.50 for Gemini 3.1 Pro.
Which has the bigger context window, Gemini 3.1 Pro or Grok 4.5?
Gemini 3.1 Pro has the larger context window: 2,000,000 tokens vs 500,000.
Can Gemini 3.1 Pro replace Grok 4.5 for coding?
Both are viable for coding. Largest context window of any current model (2M tokens) (Gemini 3.1 Pro) vs xAI coding model for agents and engineering (Grok 4.5) — pick based on which strength matters more for your workload.
Neither of these? See Gemini 3.1 Pro alternatives or Grok 4.5 alternatives.
What related comparisons help choose between Gemini 3.1 Pro and Grok 4.5?
Gemini 3.1 Pro pricingGrok 4.5 pricingvs Claude Opus 4.8vs Claude Sonnet 5vs DeepSeek V4 Provs GPT-5.6 SolPremium model tests
Pricing verified 2026-04-06. Specs verified 2026-08-14.