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 Gemini 2.5 Pro | Gemini 3.5 |  GPT-5.5OpenAI |  DeepSeek-R1DeepSeek | |
|---|---|---|---|---|
| Vendor | OpenAI | DeepSeek | ||
| Family | Gemini | Gemini | GPT | DeepSeek |
| Release date | 2025-03-25 | 2026-05-20 | 2026-04-23 | 2025-01-20 |
| Context window | 2,000,000 tokens | 2,000,000 tokens | 400,000 tokens | 128,000 tokens |
| Parameters | — | — | — | 671B |
| Modality | text, vision, audio, video | text, vision, audio, video | text, vision, audio | text |
| License | proprietary | proprietary | proprietary | MIT |
| Source | proprietary | proprietary | proprietary | open weights |
| Description | Predecessor to Gemini 3 Pro. | 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 smartest and most intuitive model — successor to GPT-5, with major coding, research, and document workflow gains. GPT-5.5 Pro variant also available for heavier reasoning. | Reasoning-focused open-weight model. |
| Links | ||||
| Benchmarks | ||||
| MMLU-Pro | 84.1% | 88.9% | 87.6% | — |
| GPQA-D | 84.0% | 91.2% | 89.4% | — |
| HumanEval | — | — | 96.8% | — |
| Aider | — | — | 89.7% | — |
| AIME-25 | — | 96.1% | 94.2% | 79.8% |
| LiveCB | — | — | 78.9% | — |
| MMMU | 72.4% | 86.0% | 78.4% | — |
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