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 GPT-5.5OpenAI | o3 OpenAI |  Gemini 2.5 Flash |  Grok 4xAI | |
|---|---|---|---|---|
| Vendor | OpenAI | OpenAI | xAI | |
| Family | GPT | o-series | Gemini | Grok |
| Release date | 2026-04-23 | 2025-04-16 | — | 2025-07-09 |
| Context window | 400,000 tokens | 200,000 tokens | 1,000,000 tokens | 256,000 tokens |
| Parameters | — | — | — | — |
| Modality | text, vision, audio | text, vision | text, vision, audio | text |
| 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. | — | — |
| Links |
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Gemini 2.5 Flash✓
Claude 4.6 SonnetmaxGPT-5.5✓
DeepSeek-V4-Flashmax
Qwen3.6-27BmaxGemini 3 PromaxDeepSeek-V4-PromaxClaude 4.7 OpusmaxClaude 4.5 HaikumaxDeepSeek-V3.1maxGPT-5maxGrok 4✓Qwen3 235Bmaxo3✓GPT-4.1max
Llama 4 ScoutmaxLlama 4 MaverickmaxGemini 2.5 PromaxDeepSeek-R1max
Mistral Large 2maxMax 4 models. Remove one to add another.