GoKawiilOpenAI releases GPT-6 Sol and Luna models with lower API pricing
OpenAI launched GPT-6 Sol and GPT-6 Luna, positioned as cheaper, more accurate successors to GPT-5.6 Sol and Luna, with API costs cut by 50%. OpenAI says GPT-6 Sol outperforms Claude Opus 5 at roughly 9% of its cost and matches Claude Fable 5.1 on coding tasks at lower cost, while making about half as many errors as its predecessor. Both models are rolling out today in ChatGPT Work and Codex for Pro, Plus, Business, Enterprise, and Edu users, with Luna also available to Free and Go plan users in the desktop app.
GoKawiil's interpretation of the reporting above, not reported fact.
The price cuts and accuracy claims suggest OpenAI is trying to undercut rivals like Anthropic on cost-efficiency rather than just raw capability, which could pressure competitors to lower their own API pricing. However, since Anthropic recently released the faster, cheaper Claude Opus 5.5, OpenAI's comparisons to the older Opus 5 may already be outdated, leaving the real competitive standing unclear until independent benchmarks emerge.
- GPT-6 Sol and Luna cost 50% less than their GPT-5.6 predecessors via the API
- OpenAI claims GPT-6 Sol beats Claude Opus 5 at about 9% of its cost
- Models are live today in ChatGPT Work and Codex, with Luna also reaching Free and Go users
Source: androidauthority.com, 2026-09-23
Published there as: “ChatGPT’s new GPT-6 Sol and Luna models are faster, better, and far more affordable”
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