Gemini 2.5 Pro vs GPT-5.5
Direct spec comparison of Gemini 2.5 Pro (from Google) and GPT-5.5 (from OpenAI). Want a 3- or 4-way comparison? Open the multi-model tool →
 Gemini 2.5 Pro |  GPT-5.5OpenAI | |
|---|---|---|
| Vendor | OpenAI | |
| Family | Gemini | GPT |
| Release date | 2025-03-25 | 2026-04-23 |
| Context window | 2,000,000 tokens | 400,000 tokens |
| Parameters | — | — |
| Modality | text, vision, audio, video | text, vision, audio |
| License | proprietary | proprietary |
| Source | proprietary | proprietary |
| Description | Predecessor to Gemini 3 Pro. | 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. |
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