GPT-6 Sol and Luna split complex work from high-volume tasks
OpenAI released GPT-6 Sol and GPT-6 Luna in the API on September 22. Both reasoning models accept text and image input and return text through the Responses and Chat Completions APIs. OpenAI positions Sol for complex coding and agentic workflows and Luna for focused, high-volume work. For standard processing with prompts up to 272K input tokens, listed prices per million tokens are $2 input and $10 output for Sol, and $0.10 input and $0.50 output for Luna, with separate cached-input rates. Longer prompts and other processing tiers can differ. Teams should route by task difficulty, failure cost, latency target, and quality evidence rather than choosing one model solely from the headline token price.

