Gemini 2.5 Flash vs Gemini 3.1 Pro
Gemini 2.5 Flash (Google DeepMind) and Gemini 3.1 Pro (Google DeepMind) compared on benchmarks, pricing, context window, and use-case rankings.
- Gemini 3.1 Pro leads on overall intelligence (ECI 155 vs 143).
- Gemini 3.1 Pro ranks higher for coding (65th vs 21th percentile).
| Attribute | Gemini 2.5 Flash | Gemini 3.1 Pro |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 143 | 155 |
| Coding | 21 | 65 |
| Math | 15 | 74 |
| Reasoning & Knowledge | 20 | 94 |
| Agentic & Tools | 4 | 83 |
| Specifications | ||
| Developer | Google DeepMind | Google DeepMind |
| Family | Gemini | Gemini |
| Released | Sep 25, 2025 | Feb 19, 2026 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | 1M | — |
| Price — $/M input | $0.30 | — |
| Price — $/M output | $2.50 | — |
| Inputs | file, image, text, audio, video | — |
| Outputs | text | — |
| Benchmarks | ||
| AIME 2024/2025 | 73% | 96% |
| APEX | 2% | 34% |
| ARC-AGI | 33% | 98% |
| ARC-AGI-2 | 3% | 77% |
| FrontierMath | 5% | 37% |
| FrontierMath Tier 4 | 4% | 17% |
| GPQA Diamond | 79% | 94% |
| Humanity's Last Exam | 12% | 46% |
| LiveCodeBench | 70% | — |
| MMLU-Pro | 83% | — |
| SciCode | 39% | — |
| SimpleBench | 41% | 80% |
| Terminal-Bench | 17% | 80% |
| WeirdML | 42% | 72% |
| τ²-bench | 32% | — |
| GSO (code optimization) | — | 23% |
| METR task horizon | — | 6.4 h |
| SimpleQA Verified | — | 77% |
| SWE-bench Verified | — | 76% |
| WebDev Arena | — | 1461 |
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 2.5 Flash better than Gemini 3.1 Pro?
On Epoch AI's Capabilities Index, Gemini 3.1 Pro scores higher (155) than Gemini 2.5 Flash (143). The right pick depends on your task — compare their coding, math, and reasoning scores in the table above.
Which is better for coding, Gemini 2.5 Flash or Gemini 3.1 Pro?
Across coding benchmarks like SWE-bench Verified and Terminal-Bench, Gemini 3.1 Pro ranks higher — 65th vs 21th 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.