Gemini 3.1 Pro
ECI#27
155Gemini 3.1 Pro is a closed-weights model from Google DeepMind, released February 19, 2026. It has an ECI score of 155 and ranks 27th of 249 tracked models. At the time of its release, it ranked 4th of 188 tracked models. At $2/Mtok for input tokens and $12/Mtok for output tokens, it is more expensive per token than similarly-capable models.
Input price$2 / 1M tokens
Output price$12 / 1M tokens
ParametersUnknown
Training computeUnknown
Gemini 3.1 Pro vs select alternatives
Reasoning
| Domain | Benchmark | Gemini 3.1 Pro | |||
|---|---|---|---|---|---|
ECI scoreBest score 166 | 155 | 153 | 157 | 155 | |
| Ranking | #27 | #35 | #15 | #24 | |
| Games | Chess PuzzlesBest score 72.0% | ||||
Earthborne Rangers (EBR-bench)Best score 76.2% | |||||
Mystery Game PuzzlesBest score 84.0% | |||||
| Mathematics | FrontierMath Tiers 1-3 (v2)Best score 93.7% | ||||
FrontierMath Tier 4 (v2)Best score 97.6% | |||||
OTIS Mock AIME 2024-2025Best score 100.0% | |||||
| Science | GPQA DiamondBest score 95.8% | ||||
| Software engineering | SWE-bench VerifiedBest score 83.5% | ||||
| World knowledge | SimpleQA VerifiedBest score 75.6% |
