OpenAI Releases GPT-5.2-Codex
Narrative
Most advanced agentic coding model yet for complex software engineering. Optimized for long-horizon work via context compaction, large refactors/migrations, Windows environments, stronger cybersecurity capabilities (below "High" Preparedness Framework threshold), reliable tool calling, and improved factuality.
Reality
Released December 18, 2025 in all Codex surfaces for paid ChatGPT users immediately. API access rolled out in coming weeks. Invite-only trusted access piloted for vetted defensive cybersecurity professionals. Builds on GPT-5.2 with native compaction for token efficiency and endless coherent sessions. SOTA performance on key coding benchmarks.
Implication
Major step in agentic coding frontiers. Addresses dual-use concerns (esp. cybersecurity) with responsible safeguards and phased deployment. Enables dependable long-running tasks. Sets stage for subsequent Codex expansions and model iterations.