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Practical Migration Guide for Developers and Teams Using OpenAI Codex: Navigating the June 2, 2026 Sunset of GPT-5.2 and GPT-5.3-Codex As OpenAI advances its AI product ecosystem, the planned sunset of the GPT-5.2 and GPT-5.3-Codex models for ChatGPT logins on June 2, 2026, signals a significant shift for developers and teams who have built solutions around these Codex variants.
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