OpenAI · Claude · Codex · GPT · OpenAI
Introducing GPT-6 Sol and Luna
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Key facts
- On Agents’ Last Exam, which evaluates agents on complex professional workflows, GPT‑6 Sol at max effort scores 56.4%, above Claude Opus 5’s highest score in the evaluation at 60% lower cost per task
- GPT‑6 Sol also exceeds Claude Fable 5.1 at far lower cost, and even bests low-effort GPT‑6 Astra
- That’s why they're expanding the GPT‑6 universe with GPT‑6 Sol and GPT‑6 Luna
- GPT‑6 Luna at max effort scores 66.6%, comparable to Claude Opus 5 and Fable 5 at medium effort
Summary
Earlier this month, they introduced GPT‑6 Astra, the most intelligent and aligned model in the world. That’s why they're expanding the GPT‑6 universe with GPT‑6 Sol and GPT‑6 Luna. The GPT‑6 models lead across the cost–intelligence curve, combining exceptional capabilities at every tier with infrastructure that delivers them efficiently at scale. GPT‑5.6 Sol → GPT‑6 Sol.