Gemini 3.1 Pro vs o3
Gemini 3.1 Pro 
o3 Verdict
- Gemini 3.1 Pro leads on quality: 63.9 vs 61.6.
- Gemini 3.1 Pro is stronger in composite, instruction following, knowledge, long context, multimodal, reasoning.
- o3 is stronger in agents & tools, coding, human preference, maths.
- o3 is 1.3× cheaper ($3.50 vs $4.50 per 1M blended).
| Metric | Gemini 3.1 Pro | o3 |
|---|---|---|
| BenchLeader Index | 63.9 | 61.6 |
| Agents & tools score | 63.4 | 70.3 |
| Coding score | 59.8 | 62.0 |
| Composite score | 67.4 | 54.5 |
| Human preference score | 59.8 | 62.3 |
| Instruction following score | 69.6 | 65.0 |
| Knowledge score | 66.3 | 58.0 |
| Long context score | 67.6 | 63.8 |
| Maths score | 60.7 | 78.6 |
| Multimodal score | 66.2 | 57.9 |
| Reasoning score | 69.8 | 61.5 |
| Blended price $/M | $4.50 | $3.50 |
| Output speed | 108 tok/s | 107 tok/s |
| Time to first answer | 28.3 s | 6.3 s |
| Context window | 1.0M | 200k |
| GPQA Diamond | 94.1% | – |
| FrontierMath Tiers 1–3 | 59.6% | – |
| FrontierMath Tier 4 | 26.8% | – |
| OTIS Mock AIME | 95.6% | – |
| Humanity's Last Exam | 46.4% | – |
| Terminal-Bench | 80.2% | – |
| SimpleBench | 79.6% | – |
| SciCode | 58.9% | – |
| WeirdML | 72.1% | – |
| APEX-Agents | 33.5% | – |
| ProofBench | 26.0% | – |
| GSO-Bench | 22.6% | – |
| Epoch Capabilities Index | 155 | 146.9 |
| LMArena Text | 1487 | 1432 |
| LMArena Hard Prompts | 1508 | 1441 |
| LMArena Coding | 1520 | 1460 |
| LMArena WebDev | 1447 | – |
| LMArena Vision | 1295 | 1214 |
| LMArena Agent | -5.6 | – |
| AA Intelligence Index | 30.4 | 20.2 |
| IFBench | 77.1% | 71.4% |
| AA-LCR | 82.0% | 74.7% |
| MMMU-Pro | 82.4% | 70.1% |
| AA-Omniscience | 31.9 | -15.6 |
| Terminal-Bench Hard | 53.8% | 37.1% |
| GPQA Diamond (AA) | 94.1% | 82.7% |
| Humanity's Last Exam (AA) | 47.0% | 20.1% |
| SciCode (AA) | 58.7% | – |
| τ²-Bench Telecom (AA) | 95.6% | 80.7% |
| AIME 2026 | 98.3% | – |
| HMMT February 2026 | 94.7% | – |
| MathArena Apex | 60.9% | – |
| MultiChallenge | 71.4% | – |
| PRBench Finance | 41.9% | 47.7% |
| PRBench Legal | 44.0% | 48.6% |
| MultiNRC | 64.7% | – |
| HiL-Bench | 35.3% | – |
| TutorBench | 53.0% | – |
| EQ-Bench 4 | 1142 | – |
| MMMU (validation) | – | 82.9% |
| MMMU-Pro (official) | – | 76.4% |
| Kagi LLM Benchmark | – | 67.6% |
| IFEval (HELM) | – | 86.9% |
| Omni-MATH (HELM) | – | 71.4% |
| WildBench (HELM) | – | 86.1% |
| MMLU-Pro (HELM) | – | 85.9% |
| GPQA Diamond (HELM) | – | 75.3% |
| HELM Capabilities mean | – | 81.1% |
| Aider Polyglot | – | 81.3% |
| SWE-bench Verified (bash only) | – | 58.4% |
| SWE-bench Verified (any scaffold) | – | 58.4% |
| ARC-AGI-1 | 98.0% | – |
| ARC-AGI-2 | 77.1% | – |
| ARC-AGI-3 | 0.4% | – |
| BFCL Overall | – | 63.0% |
Data as of 2026-09-12. Best configuration of each model; every score links to its source on the model pages.
Gemini 3.1 Pro vs o3: questions
- Is Gemini 3.1 Pro better than o3?
- Gemini 3.1 Pro leads on quality: 63.9 vs 61.6. The BenchLeader Index combines every independent quality benchmark; Gemini 3.1 Pro is ahead overall as of 2026-09-12, but check the category scores for your use.
- Is Gemini 3.1 Pro better than o3 for coding?
- o3 scores higher in coding (62 vs 60 on the category index, where 50 is average).
- Is Gemini 3.1 Pro better than o3 for agentic tasks?
- o3 scores higher in agentic tasks (70 vs 63 on the category index, where 50 is average).
- Which is cheaper, Gemini 3.1 Pro or o3?
- o3 is cheaper: $3.50 against $4.50 per million tokens, blended at three input tokens per output token.
- Which is faster, Gemini 3.1 Pro or o3?
- Gemini 3.1 Pro streams faster: 108 against 107 output tokens per second.
- Which has the larger context window?
- Gemini 3.1 Pro accepts more context: 1.0M against 200k tokens.