OpenAI halves API prices with GPT-6 Sol and Luna
OpenAI released two new models trained with methods similar to Astra. Sol focuses on reasoning, Luna on speed and volume.
Two models, two jobs
GPT-6 Sol and GPT-6 Luna launched on September 22, minutes after Anthropic announced Opus 5.5. Sol costs $2 per million input tokens and $10 per million output. Luna costs $0.10 and $0.50. OpenAI says the pricing is permanent, not a promotion.
The claims
OpenAI says Sol makes about half as many mistakes as GPT-5.6 Sol. Luna is tuned for low latency and high volume. With Astra at $10 and $50 on top, OpenAI now has a three-tier family.
Who it affects
For repetitive work such as sorting customer messages or filling forms, Luna pricing cuts costs sharply. Our AI agent page explains how such a flow is built.
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