OpenAI launches GPT-6 Sol and Luna at half the price — SkimNews
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- OpenAI launched updated GPT-6 Sol and Luna models, expanding the GPT-6 generation shortly after releasing GPT-6 Astra earlier this month.
- The new Sol and Luna models are priced at half the cost of the 5.6 series, a drop OpenAI attributes to improvements in caching and inference.
- GPT-6 Sol makes about half as many factual mistakes as its predecessor, reaching "Astra-level reliability at much lower cost" on OpenAI's internal factuality evaluation, which draws on de-identified real-world conversations.
- OpenAI claims the new models handle tasks substantially better than Anthropic's Fable and Opus models.
- Anthropic released a new version of Opus 5.5 just 90 minutes before OpenAI's announcement, underscoring the back-and-forth competition between the two labs.
- The updated models are now available in ChatGPT Work and Codex for most paid accounts and in the ChatGPT API, while Luna is also accessible via the desktop app and to Free and Go users, with a gradual ChatGPT rollout expected through the day.
Why it matters: OpenAI's 50% API price cut on its mid-tier models, paired with claimed accuracy gains and explicit comparisons to Anthropic's Fable and Opus, compresses the cost-quality gap between the two labs. The 90-minute window between Anthropic's Opus 5.5 release and OpenAI's announcement shows both companies are now shipping competing model updates in near real-time.
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