Gemini 3 Pro vs o3
Direct spec comparison of Gemini 3 Pro (from Google) and o3 (from OpenAI). Want a 3- or 4-way comparison? Open the multi-model tool →
 Gemini 3 Pro |  o3OpenAI | |
|---|---|---|
| Vendor | OpenAI | |
| Family | Gemini | o-series |
| Release date | 2026-04-22 | 2025-04-16 |
| Context window | 2,000,000 tokens | 200,000 tokens |
| Parameters | — | — |
| Modality | text, vision, audio, video | text, vision |
| License | proprietary | proprietary |
| Source | proprietary | proprietary |
| Description | Google DeepMind's flagship multimodal model. Best-in-class for multimodal understanding and agentic / vibe coding workflows. A "Deep Think" reasoning mode is available to AI Ultra subscribers. | Reasoning-focused model in the o-series. |
| Links | ||
| Benchmarks | ||
| MMLU-Pro | 87.1% | — |
| GPQA-D | 88.6% | 87.7% |
| HumanEval | 96.5% | — |
| Aider | 84.8% | — |
| AIME-25 | 92.8% | 88.9% |
| LiveCB | 76.1% | — |
| MMMU | 84.3% | — |
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