Cursor Debuts GPT-5 Codex Integration for Enhanced AI Coding in Its Desktop IDE

September 23, 2025

Details

  • Cursor has launched OpenAI’s GPT-5 Codex within its desktop coding environment, which adopts a VS Code–like interface.
  • This integration introduces in-editor autocomplete, multi-file refactoring, and natural-language search spanning entire repositories powered by GPT-5 Codex.
  • With support for 200,000-token context windows, the system now addresses prior GPT-4 limitations that struggled with massive monorepos.
  • Pro subscription pricing remains unchanged, while free-tier users will have a daily cap on GPT-5 Codex queries.
  • Rollout begins September 23, 2025, aiming for full workspace coverage within the week, enabled through a settings toggle.
  • Cursor still provides Claude 3.5 Sonnet, Gemini Code Expert, and a local Llama-3 model, allowing teams to A/B test various LLMs.
  • User feedback is being collected via Discord, with Copilot-style enhancements planned for the October update.

Impact

This integration challenges rivals like GitHub Copilot and Replit Ghostwriter to keep pace with GPT-5 features and larger context sizes. Cursor’s continued model flexibility and stable pricing could help it win enterprise interest faster, especially as data privacy laws tighten. The arrival comes amid growing competition from Anthropic and others, signaling a rapid evolution in how AI models assist with complex software development.

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