Compare models
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 GPT-5.5OpenAI |  Gemini 2.5 Pro | Gemini 2.5 Flash | |
|---|---|---|---|
| Vendor | OpenAI | ||
| Family | GPT | Gemini | Gemini |
| Release date | 2026-04-23 | 2025-03-25 | — |
| Context window | 400,000 tokens | 2,000,000 tokens | 1,000,000 tokens |
| Parameters | — | — | — |
| Modality | text, vision, audio | text, vision, audio, video | text, vision, audio |
| 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. | Predecessor to Gemini 3 Pro. | — |
| Links |
