OpenAI launches GPT-6 Sol and Luna, boasting lower cost and fewer mistakes
OpenAI released GPT-6 Sol and Luna, halving API prices and claiming fewer factual and coding errors.
OpenAI expanded the GPT-6 lineup with Sol and Luna after introducing GPT-6 Astra earlier in September 2026. The company says API access costs half as much as the GPT-5.6 Sol and Luna series because of caching and inference improvements. It claims GPT-6 Sol makes about half as many factual mistakes as its predecessor and beats Anthropic's Fable and Opus models on several tasks. The models are available in ChatGPT Work, Codex, and the API, with a gradual ChatGPT rollout; Anthropic had shipped Opus 5.5 about 90 minutes earlier.
- Sol and Luna follow GPT-6 Astra, launched earlier in September.
- API prices are half those of the GPT-5.6 Sol and Luna series.
- OpenAI says Sol makes about half as many factual mistakes.
- Anthropic released Opus 5.5 about 90 minutes before this launch.
- Access starts in ChatGPT Work, Codex, and the API.
- Vendors
- OpenAI
From the original article
2 min read at techcrunch.com
OpenAI is launching two new models, which it says are cut from the same cloth as Astra.
By Lucas Ropek · techcrunch.com
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