GPT-6 Sol and Luna launch alongside Claude Opus 5.5
OpenAI says Sol and Luna’s API prices are 50% below GPT-5.6. A launch-day recap cites Anthropic’s claim that Opus 5.5 costs around 40% less than Opus 5 on typical workloads at default settings.
TLDR
OpenAI announced GPT-6 Sol and Luna on September 22, 2026, saying API prices are permanently 50% lower than GPT-5.6 and that it was adding a “banked reset” to all Plus, Pro and Business accounts.
A launch-day recap cites Anthropic’s claim that Claude Opus 5.5 delivers Fable 5.1-level performance on most work and costs around 40% less than Opus 5 on typical workloads at default settings.
Early discussion weighs performance against price. One commenter argues that Opus 5.5 looks strong on benchmark scores alone, but GPT-6 Sol becomes harder to ignore when cost is factored in.
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