Jan 17
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How To Use OpenAI Codex In Cursor | (2025) NEW LATEST UPDATED METHOD | Quick & Easy A crisp 2025 walkthrough to use OpenAI Codex inside Cursor for codegen, edits, and inline fixes. You’ll set your OpenAI API key, pick the right GPT-5-Codex / GPT-5.1 model, wire it to Cursor’s Composer/Chat/Autocomplete, and add repo context so Codex stops hallucinating your APIs. We’ll also cover rate-limit/cost controls and when to switch to a lighter model for bulk refactors. (Note: Codex is delivered via the OpenAI Responses API, and you select it as a model in Cursor.) Cursor ✅ Setup fast: Cursor → Settings → Models/Providers → OpenAI → paste API key → choose “GPT-5-Codex” (or GPT-5.1) → enable Composer/Chat/Inline. Add your repo to Context so Codex sees your code. Cursor 🔍 Daily flow: Cmd/Ctrl+K Composer for new files/tests, Inline Edit for small fixes, Chat for multi-step plans (paste errors, ask for diffs/patches). ⚠️ Gotchas: Codex is API-billed—set context window limits, cap max output tokens, and prefer snapshots for stability. Fall back to a smaller model for mass changes. OpenAI Platform 💡 Pro tips: pin a project prompt (stack, style, lint rules), feed schema/types first, ask for runnable diffs, and require unit tests with each patch. Business inquiries and sponsorship: howtoliterally@gmail.com (Amazon Storefront, Doesn’t give you discounts but supports the channel!): https://amzn.to/4mYECc8 #OpenAI #Codex #Cursor #AIProgramming #GPT5Codex #ResponsesAPI #CodeGeneration #Refactor #UnitTests #DevTools #2025 #HowToLiterally