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codex-1

OpenAI · GPT Codex line · coding

Released May 16, 2025Replaced by GPT-5-CodexLine discontinued Mar 5, 2026

codex-1 was released by OpenAI on May 16, 2025, as a coding model in the GPT Codex line.

  • Release 1 of 7 in the GPT Codex line.
  • The first release in this line.
  • Replaced by GPT-5-Codex on September 15, 2025, 122 days later.
  • These days the line ships a new model about every 49 days.

No detailed card for this model: we only add numbers published by the maker or by independent benchmarks. Sources: OpenAI

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Where the GPT Codex line stands

GPT-5.3-Codex-Spark is the current model in this line. The card shows how long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.

GPT-5.3-Codex-Spark

OpenAI · GPT Codex line · coding
Discontinuedofficially discontinued on Mar 5, 2026
Released Feb 12, 2026 · what changed →
Days since last release
GPT-5.3-Codex-Spark · Feb 12, 2026
234
days
Usual gap
49
days
Recent gaps
GPT-5.3-Codex-Spark · Feb 2026
7
GPT-5.3 Codex · Feb 2026
49
GPT-5.2 Codex · Dec 2025
29
GPT-5.1-Codex-Max · Nov 2025
65

Every GPT Codex release

Newest first. See the full line with every card →

  1. Feb 12, 2026GPT-5.3-Codex-Spark
  2. Feb 5, 2026GPT-5.3 Codex
  3. Dec 18, 2025GPT-5.2 Codex
  4. Nov 19, 2025GPT-5.1-Codex-Max
  5. Nov 13, 2025GPT-5.1-Codex
  6. Sep 15, 2025GPT-5-Codex
  7. May 16, 2025codex-1 · this page