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 GPT-5.5OpenAI | o3 OpenAI |  Gemini 3 Pro | Gemini 2.5 Flash | |
|---|---|---|---|---|
| Vendor | OpenAI | OpenAI | ||
| Family | GPT | o-series | Gemini | Gemini |
| Release date | 2026-04-23 | 2025-04-16 | 2026-04-22 | — |
| Context window | 400,000 tokens | 200,000 tokens | 2,000,000 tokens | 1,000,000 tokens |
| Parameters | — | — | — | — |
| Modality | text, vision, audio | text, vision | text, vision, audio, video | text, vision, audio |
| License | proprietary | proprietary | proprietary | proprietary |
| Source | proprietary | 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. | Google DeepMind's flagship multimodal model. Best-in-class for multimodal understanding and agentic / vibe coding workflows. A "Deep Think" reasoning mode is available to AI Ultra subscribers. | — |
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Mistral Large 2maxMax 4 models. Remove one to add another.