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 o3OpenAI |  Gemini 3.5 | GPT-5 OpenAI | Gemini 3 Pro | |
|---|---|---|---|---|
| Vendor | OpenAI | OpenAI | ||
| Family | o-series | Gemini | GPT | Gemini |
| Release date | 2025-04-16 | 2026-05-20 | 2025-08-07 | 2026-04-22 |
| Context window | 200,000 tokens | 2,000,000 tokens | 400,000 tokens | 2,000,000 tokens |
| Parameters | — | — | — | — |
| Modality | text, vision | text, vision, audio, video | text, vision, audio | text, vision, audio, video |
| License | proprietary | proprietary | proprietary | proprietary |
| Source | proprietary | proprietary | proprietary | proprietary |
| Description | Reasoning-focused model in the o-series. | Google DeepMind's next-gen Gemini — positioned as "frontier intelligence with action". Built for complex agentic workflows. Announced at Google I/O 2026. | OpenAI's flagship general-purpose model. Superseded by GPT-5.5 in April 2026. | 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. |
| Links | ||||
| Benchmarks | ||||
| MMLU-Pro | — | 88.9% | 85.1% | 87.1% |
| GPQA-D | 87.7% | 91.2% | 87.3% | 88.6% |
| HumanEval | — | — | 95.2% | 96.5% |
| Aider | — | — | 85.4% | 84.8% |
| AIME-25 | 88.9% | 96.1% | 91.0% | 92.8% |
| LiveCB | — | — | 74.5% | 76.1% |
| MMMU | — | 86.0% | 74.1% | 84.3% |
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