Compare models
Pick up to 4models. Specs render side-by-side. Share the URL — it's stateless.
 GPT-5.5OpenAI |  DeepSeek-V3.1DeepSeek |  Claude 4.5 HaikuAnthropic | |
|---|---|---|---|
| Vendor | OpenAI | DeepSeek | Anthropic |
| Family | GPT | DeepSeek | Claude |
| Release date | 2026-04-23 | 2025-08-21 | 2025-10-01 |
| Context window | 400,000 tokens | 128,000 tokens | 200,000 tokens |
| Parameters | — | 671B | — |
| Modality | text, vision, audio | text | text, vision |
| License | proprietary | MIT | proprietary |
| Source | 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. | Large MoE open-weight model. Predecessor to DeepSeek-V4. | Fast, cost-effective Claude model. |
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