Deep Dive: OpenAI Codex Complete Guide — Every Feature, Benchmark, and Use Case in 2026
⚡ TL;DR — Key Takeaways What it is: OpenAI Codex in 2026 is a full software-engineering stack — a family of specialized models (gpt-5-codex through gpt-5.3-codex), a CLI agent, IDE extension, cloud sandbox runtime, and API endpoints with prompt caching and tool-use built in. Who it’s for: Developer teams, platform…
