OpenAI
OpenAI's flagship frontier model for complex reasoning, coding, and professional work. Supports a 1M-token context window, advanced tool use, and stronger long-horizon task execution than GPT-5.4.
OpenAI's flagship frontier model for complex reasoning, coding, and professional work.
66.7
Quality Score
1275
Arena ELO
1M
Parameters
1M
Context
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Apr 2026
Released