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 GPT-5.5OpenAI | GPT-5 OpenAI |  DeepSeek-R1DeepSeek | o3 OpenAI | |
|---|---|---|---|---|
| Vendor | OpenAI | OpenAI | DeepSeek | OpenAI |
| Family | GPT | GPT | DeepSeek | o-series |
| Release date | 2026-04-23 | 2025-08-07 | 2025-01-20 | 2025-04-16 |
| Context window | 400,000 tokens | 400,000 tokens | 128,000 tokens | 200,000 tokens |
| Parameters | — | — | 671B | — |
| Modality | text, vision, audio | text, vision, audio | text | text, vision |
| License | proprietary | proprietary | MIT | proprietary |
| Source | proprietary | proprietary | open weights | proprietary |
| 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. | OpenAI's flagship general-purpose model. Superseded by GPT-5.5 in April 2026. | Reasoning-focused open-weight model. | Reasoning-focused model in the o-series. |
| Links |
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Gemini 2.5 Flashmax
Claude 4.6 SonnetmaxGPT-5.5✓DeepSeek-V4-Flashmax
Qwen3.6-27BmaxGemini 3 PromaxDeepSeek-V4-PromaxClaude 4.7 OpusmaxClaude 4.5 HaikumaxDeepSeek-V3.1maxGPT-5✓
Grok 4maxQwen3 235Bmaxo3✓GPT-4.1max
Llama 4 ScoutmaxLlama 4 MaverickmaxGemini 2.5 PromaxDeepSeek-R1✓
Mistral Large 2maxMax 4 models. Remove one to add another.