Compare models
Pick up to 4models. Specs render side-by-side. Share the URL — it's stateless.
 GPT-5.5OpenAI | o3 OpenAI |  Claude 4.6 SonnetAnthropic | |
|---|---|---|---|
| Vendor | OpenAI | OpenAI | Anthropic |
| Family | GPT | o-series | Claude |
| Release date | 2026-04-23 | 2025-04-16 | — |
| Context window | 400,000 tokens | 200,000 tokens | 200,000 tokens |
| Parameters | — | — | — |
| Modality | text, vision, audio | text, vision | text, vision |
| License | proprietary | proprietary | proprietary |
| Source | proprietary | proprietary | 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. | Reasoning-focused model in the o-series. | — |
| Links |
