GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token...
In / out price$5.00/$30.00per 1M tokens
Context
1.1M tokens
Parameters
Undisclosed
Modalities
→
Released
Apr 24, 2026
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