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2026 Critical Updates

April 2026 platform changes: Codex agent, GPT-5.4 family GA, model deprecations, and the Responses API migration timeline. Part of the free OpenAI Academy โ€” every lesson below is open to everyone, no signup required.

1 lessons400 XP~15 min total100% free

// LESSONS IN THIS MODULE

  1. 01April 2026 Platform Updates15 min ยท 400 XP

    What's New in April 2026 Codex Agent OpenAI expanded Codex from a code-generation model into a full autonomous coding agent rewritten in Rust. Availab...

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2026 Critical Updates โ€” OpenAI Academy Module | Free Lessons