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 GPT-5.5OpenAI |  DeepSeek-V4-ProDeepSeek | DeepSeek-R1 DeepSeek |  Grok 4xAI | |
|---|---|---|---|---|
| Vendor | OpenAI | DeepSeek | DeepSeek | xAI |
| Family | GPT | DeepSeek | DeepSeek | Grok |
| Release date | 2026-04-23 | 2026-04-22 | 2025-01-20 | 2025-07-09 |
| Context window | 400,000 tokens | 1,000,000 tokens | 128,000 tokens | 256,000 tokens |
| Parameters | — | 1.6T (49B active) | 671B | — |
| Modality | text, vision, audio | text | text | text |
| License | proprietary | MIT | MIT | proprietary |
| Source | proprietary | open weights | open weights | 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. | DeepSeek's flagship open-weight MoE. 1.6T parameters with 49B activated, 1M-token context, and a hybrid attention scheme (CSA + HCA) that delivers long-context inference at ~27% of V3.2's FLOPs. | Reasoning-focused open-weight model. | — |
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Gemini 2.5 Flashmax
Claude 4.6 SonnetmaxGPT-5.5✓DeepSeek-V4-Flashmax
Qwen3.6-27BmaxGemini 3 PromaxDeepSeek-V4-Pro✓Claude 4.7 OpusmaxClaude 4.5 HaikumaxDeepSeek-V3.1maxGPT-5maxGrok 4✓Qwen3 235Bmaxo3maxGPT-4.1max
Llama 4 ScoutmaxLlama 4 MaverickmaxGemini 2.5 PromaxDeepSeek-R1✓
Mistral Large 2maxMax 4 models. Remove one to add another.