GPT-6 Luna may already be in A/B testing — Alex Getman

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Alex Getman @alexgetmancom · 21 Sep 2026, 15:06 UTC · Updated 31 Oct 2026, 22:32 UTC

GPT-6 Luna may already be in A/B testing.

Some GPT-5.6 Luna requests are being served as GPT-6 Luna behind the scenes.

Screenshot of code from pricing.coldstart.test.ts showing a comment that the Codex backend responds to some `gpt-5.6-luna` requests with `gpt-6-luna`, suggesting GPT-6 Luna may be in A/B testing.

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