Gemini 3.1 Pro vs Grok 4 Fast
Gemini 3.1 Pro (Google DeepMind) and Grok 4 Fast (xAI) compared on benchmarks, pricing, context window, and use-case rankings.
- Gemini 3.1 Pro leads on overall intelligence (ECI 155 vs 145).
- Gemini 3.1 Pro ranks higher for coding (65th vs 42th percentile).
| Attribute | Gemini 3.1 Pro | Grok 4 Fast |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 155 | 145 |
| Coding | 65 | 42 |
| Math | 74 | 55 |
| Reasoning & Knowledge | 94 | 36 |
| Agentic & Tools | 83 | 23 |
| Specifications | ||
| Developer | Google DeepMind | xAI |
| Family | Gemini | Grok |
| Released | Feb 19, 2026 | Sep 19, 2025 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | — | — |
| Price — $/M input | — | — |
| Price — $/M output | — | — |
| Inputs | — | — |
| Outputs | — | — |
| Benchmarks | ||
| AIME 2024/2025 | 96% | 90% |
| APEX | 34% | — |
| ARC-AGI | 98% | 49% |
| ARC-AGI-2 | 77% | 5% |
| FrontierMath | 37% | — |
| FrontierMath Tier 4 | 17% | — |
| GPQA Diamond | 94% | 85% |
| GSO (code optimization) | 23% | — |
| Humanity's Last Exam | 46% | 17% |
| METR task horizon | 6.4 h | — |
| SimpleBench | 80% | — |
| SimpleQA Verified | 77% | — |
| SWE-bench Verified | 76% | — |
| Terminal-Bench | 80% | — |
| WebDev Arena | 1461 | 1149 |
| WeirdML | 72% | 43% |
| LiveCodeBench | — | 83% |
| MMLU-Pro | — | 85% |
| SciCode | — | 44% |
| τ²-bench | — | 66% |
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
Frequently asked questions
Is Gemini 3.1 Pro better than Grok 4 Fast?
On Epoch AI's Capabilities Index, Gemini 3.1 Pro scores higher (155) than Grok 4 Fast (145). The right pick depends on your task — compare their coding, math, and reasoning scores in the table above.
Which is better for coding, Gemini 3.1 Pro or Grok 4 Fast?
Across coding benchmarks like SWE-bench Verified and Terminal-Bench, Gemini 3.1 Pro ranks higher — 65th vs 42th percentile among the models tracked on Model Beat.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.