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OpenAI Unveils GPT-5-Codex with Powerful New Features

10/7/2025

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Summary

Story summary

OpenAI released GPT-5-Codex, a major update to its coding assistant.
The model adapts reasoning time to task complexity and posts 74.5% on SWE-bench Verified.
Key features include IDE integration, visual previews, and GitHub code review.
During Developer Day, OpenAI announced new ChatGPT apps and the AgentKit for building agents. Codex is generally available with new SDKs and integrations.

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Story summary

OpenAI released GPT-5-Codex, a major update to its coding assistant.
The model adapts reasoning time to task complexity and posts 74.5% on SWE-bench Verified.
Key features include IDE integration, visual previews, and GitHub code review.
During Developer Day, OpenAI announced new ChatGPT apps and the AgentKit for building agents. Codex is generally available with new SDKs and integrations.