GPT-5.6 Luna Pro
OpenAI
openai/gpt-5.6-luna-proGPT-5.6 Luna Pro is a higher-reasoning-effort version of the Luna tier in OpenAI's GPT-5.6 family, aimed at latency-sensitive chat, classification, and lightweight agentic tasks that need a bit more accuracy than the base Luna model.
Cost rate
0.2x
Context
1.1M
Released
Jul 9, 2026
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ReasoningTool callingStructured outputs