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 GPT-5.5OpenAI |  Gemini Omni | o3 OpenAI |  DeepSeek-V4-ProDeepSeek | |
|---|---|---|---|---|
| Vendor | OpenAI | OpenAI | DeepSeek | |
| Family | GPT | Gemini | o-series | DeepSeek |
| Release date | 2026-04-23 | 2026-05-20 | 2025-04-16 | 2026-04-22 |
| Context window | 400,000 tokens | 1,000,000 tokens | 200,000 tokens | 1,000,000 tokens |
| Parameters | — | — | — | 1.6T (49B active) |
| Modality | text, vision, audio | text, vision, audio, video | text, vision | text |
| License | proprietary | proprietary | proprietary | MIT |
| Source | proprietary | proprietary | proprietary | open weights |
| Description | 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. | Multimodal Gemini variant introduced at Google I/O 2026 — unified text, image, audio, and video processing in a single model. | Reasoning-focused model in the o-series. | DeepSeek's flagship open-weight MoE. 1.6T parameters with 49B activated, 1M-token context, and a hybrid attention scheme (CSA + HCA) that delivers long-context inference at ~27% of V3.2's FLOPs. |
| Links | ||||
| Benchmarks | ||||
| MMLU-Pro | 87.6% | — | — | 84.2% |
| GPQA-D | 89.4% | — | 87.7% | 82.4% |
| HumanEval | 96.8% | — | — | 95.1% |
| Aider | 89.7% | — | — | 80.1% |
| AIME-25 | 94.2% | — | 88.9% | 88.6% |
| LiveCB | 78.9% | — | — | 72.4% |
| MMMU | 78.4% | 82.5% | — | — |
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