OpenAI Upgrades Coding Tools to GPT-5.6 Luna, Slashing Review Costs 10x

OpenAIDevs · x · 2026-07-31

OpenAI is upgrading the auto review feature in the ChatGPT app and Codex CLI from GPT-5.4 to GPT-5.6 Luna.

Combined with Luna's newly announced price reductions, this model switch is expected to make the auto review process about 10x cheaper, significantly improving cost-efficiency for agentic workflows.

Related event: OpenAI Launches GPT-5.6: Luna Price Slashed by 80%, Sol Achieves Self-Optimization(48 posts)→

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