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Claude Code and Codex APIs: Protocol, Configuration, and First-Test Checks

This story is from 2026-08-27. It is preserved in the archive; the latest stories are on the live feed.

Claude Code and Codex APIs: Protocol, Configuration, and First-Test Checks Short answer: an OpenAI-compatible label does not make one setup work for both tools. Claude Code uses the Anthropic Messages contract; Codex custom providers use the OpenAI Responses contract. Verify the tool-specific guide…

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  1. 2026-08-27 07:26 · DEV Community — AI
    Claude Code and Codex APIs: Protocol, Configuration, and First-Test Checks

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  1. Hackers Used Anthropic’s Claude to Break Into OpenAI — Wall Street Journal Technology
  2. Anthropic adds support for the AGENTS.md instructions spec to Claude Code; OpenAI contributed AGENTS.md to the Agentic AI Foundation last year (Thomas Claburn/The Register) — Techmeme
  3. OpenAI ‘ethically hacked’ with help of Anthropic’s Claude chatbot — The Guardian AI
  4. A zero-click RCE flaw in AI coding agents could have exposed enterprise systems — InfoWorld AI
  5. Researchers used Claude to hack OpenAI — Ars Technica AI
  6. OpenAI discloses new ‘concerning’ model behaviour — Financial Times AI
  7. Tested Cursor, Claude Code, Codex and Antigravity on the exact same app build — r/AI_Agents
  8. Pay $39.99 once to put ChatGPT, Claude, Gemini, and more in a single workspace for life — Mashable AI

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