Codex, OpenAI
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The app is powered by GPT-5.2-Codex, OpenAI’s newest programming-focused large language model. It can process prompts with up to 400,000 tokens, which corresponds to about 100,000 lines of code, and understands over 50 programming languages. Users can also upload multimodal input such as interface sketches.
OpenAI Codex has arrived in JetBrains IDEs with free promotional credits. The GPT-5.2-Codex agent can autonomously debug, refactor, and build features.
On Friday, OpenAI engineer Michael Bolin published a detailed technical breakdown of how the company’s Codex CLI coding agent works internally, offering developers insight into AI coding tools that can write code,
I used GPT-5.2-Codex to find a mystery bug and hosting nightmare - it was beyond fast