Gemini 3 Pro vs o3
Gemini 3 Pro 
o3 Verdict
- Gemini 3 Pro and o3 are level on quality (62.0 vs 61.6).
- Gemini 3 Pro is stronger in composite, human preference, knowledge, long context, multimodal, reasoning.
- o3 is stronger in agents & tools, coding, instruction following, maths.
- o3 is 1.3× cheaper ($3.50 vs $4.50 per 1M blended).
| Metric | Gemini 3 Pro | o3 |
|---|---|---|
| BenchLeader Index | 62.0 | 61.6 |
| Agents & tools score | 62.3 | 70.3 |
| Coding score | 58.8 | 62.0 |
| Composite score | 64.4 | 54.5 |
| Human preference score | 68.9 | 62.3 |
| Instruction following score | 63.7 | 65.0 |
| Knowledge score | 61.0 | 58.0 |
| Long context score | 64.5 | 63.8 |
| Maths score | 52.1 | 78.6 |
| Multimodal score | 65.7 | 57.9 |
| Reasoning score | 67.1 | 61.5 |
| Blended price $/M | $4.50 | $3.50 |
| Output speed | – | 107 tok/s |
| Time to first answer | – | 6.3 s |
| Context window | 1M | 200k |
| GPQA Diamond | 92.6% | – |
| OTIS Mock AIME | 91.4% | – |
| SWE-bench Verified (Epoch) | 72.9% | – |
| Humanity's Last Exam | 37.5% | – |
| Terminal-Bench | 69.4% | – |
| SimpleBench | 76.4% | – |
| GDPval | 40.3% | – |
| Remote Labor Index | 1.3% | – |
| WeirdML | 69.9% | – |
| APEX-Agents | 31.5% | – |
| ProofBench | 20.0% | – |
| GSO-Bench | 18.6% | – |
| Epoch Capabilities Index | 153.0 | 146.9 |
| LMArena Text | 1486 | 1432 |
| LMArena Hard Prompts | 1504 | 1441 |
| LMArena Coding | 1518 | 1460 |
| LMArena WebDev | 1439 | – |
| LMArena Vision | 1305 | 1214 |
| AA Intelligence Index | 28.0 | 20.2 |
| IFBench | 70.4% | 71.4% |
| AA-LCR | 76.0% | 74.7% |
| MMMU-Pro | 80.2% | 70.1% |
| AA-Omniscience | 15.3 | -15.6 |
| Terminal-Bench Hard | 41.7% | 37.1% |
| GPQA Diamond (AA) | 90.8% | 82.7% |
| Humanity's Last Exam (AA) | 39.7% | 20.1% |
| τ²-Bench Telecom (AA) | 87.1% | 80.7% |
| LiveCodeBench | 86.4% | – |
| MMLU-Pro | 90.1% | – |
| AIME 2026 | 91.7% | – |
| HMMT February 2026 | 86.4% | – |
| MathArena Apex | 23.4% | – |
| SWE-Bench Pro | 43.3% | – |
| MCP Atlas | 70.3% | – |
| MultiChallenge | 65.7% | – |
| PRBench Finance | 39.2% | 47.7% |
| PRBench Legal | 40.6% | 48.6% |
| VISTA | 51.5% | – |
| MultiNRC | 59.0% | – |
| TutorBench | 53.7% | – |
| MMMU (validation) | – | 82.9% |
| MMMU-Pro (official) | 81.0% | 76.4% |
| Kagi LLM Benchmark | 80.1% | 67.6% |
| IFEval (HELM) | 87.6% | 86.9% |
| Omni-MATH (HELM) | 55.6% | 71.4% |
| WildBench (HELM) | 85.9% | 86.1% |
| MMLU-Pro (HELM) | 90.3% | 85.9% |
| GPQA Diamond (HELM) | 80.3% | 75.3% |
| HELM Capabilities mean | 79.9% | 81.1% |
| Aider Polyglot | – | 81.3% |
| SWE-bench Verified (bash only) | 74.2% | 58.4% |
| SWE-bench Verified (any scaffold) | 77.4% | 58.4% |
| ARC-AGI-1 | 75.0% | – |
| ARC-AGI-2 | 54.0% | – |
| BFCL Overall | 72.5% | 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 Pro vs o3: questions
- Is Gemini 3 Pro better than o3?
- Gemini 3 Pro and o3 are level on quality (62.0 vs 61.6). The BenchLeader Index combines every independent quality benchmark; Gemini 3 Pro is ahead overall as of 2026-09-12, but check the category scores for your use.
- Is Gemini 3 Pro better than o3 for coding?
- o3 scores higher in coding (62 vs 59 on the category index, where 50 is average).
- Is Gemini 3 Pro better than o3 for agentic tasks?
- o3 scores higher in agentic tasks (70 vs 62 on the category index, where 50 is average).
- Which is cheaper, Gemini 3 Pro or o3?
- o3 is cheaper: $3.50 against $4.50 per million tokens, blended at three input tokens per output token.
- Which has the larger context window?
- Gemini 3 Pro accepts more context: 1M against 200k tokens.