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Codex · availability

GPT-5.4 and GPT-5.4 mini retired from Codex for ChatGPT-signed-in users on August 31, 2026.

Stable record ID: 2026-08-31-codex-model-retirement-001

Human verified

Verified Sep 1, 2026, 8:49 AM UTC

Verified before and after

GPT-5.4; GPT-5.4 mini→GPT-5.6 Terra replaces GPT-5.4; GPT-5.6 Luna replaces GPT-5.4 mini

Official evidence

Open the official source ↗

Source ID
openai-codex-chatgpt-plan-help
Fetched
Sep 1, 2026, 8:49 AM UTC
Content hash
sha256:f3d2aff0c927ed3273c3b36923f72adc1f1411b5e1afb891afd8279202c878d5
Verification
Verified against the explicit OpenAI Help Center retirement notice. The current pricing table still shows legacy GPT-5.4 rows, so those rows were not treated as evidence of current ChatGPT-signed-in Codex availability.