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OpenAI released GPT-6 Sol and Luna, cheaper models extending its GPT-6 generation, at half the API cost of the 5.6 series. Sol makes about half as many mistakes as its predecessor, reaching Astra-level reliability. Both are available in ChatGPT Work, Codex and the API, with Luna also on desktop and for Free and Go users. Anthropic released Opus 5.5 just 90 minutes earlier.
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TechCrunch leads with the launch and broad claims of lower cost and fewer mistakes, while Techmeme foregrounds the specific Sol error reduction and Luna's cost match.
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