OpenAI released GPT‑6 Sol and GPT‑6 Luna. Both models cut API prices by half versus their GPT‑5.6 versions. They improve professional work, factuality, coding and computer use. GPT‑6 Sol outperforms Claude Opus 5 on AutomationBench at 9% of its cost. Caching improvements now discount cached input tokens by 90%. Sol and Luna are live in ChatGPT Work and Codex for paid plans. Free and Go users get Luna in the desktop app only. API access uses the gpt-6-sol and gpt-6-luna endpoints. ChatGPT rollout for these models is gradual through the day.
What changed
GPT‑5.6 Sol and Luna were priced at $4/$20 and $0.20/$1.20 per million tokens respectively.
What it unlocks
Running advanced AI tasks at half the cost with improved performance and caching.
- 50% cheaper API pricing for Sol and Luna
- 90% discount on cached input-token reads
- GPT‑6 Sol at xhigh effort outperforms Claude Opus 5 at 9% of its cost
- GPT‑6 Sol scores 56.4% on Agents’ Last Exam at 60% lower cost
What you need to act on it
- Plus, Pro, Business, Enterprise, or Edu plan for ChatGPT Work and Codex
- Free or Go plan for GPT‑6 Luna in desktop app only
- API access for gpt-6-sol and gpt-6-luna endpoints
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