GitHub - openai/openai-openapi: OpenAPI specification for the OpenAI API
OpenAPI specification for the OpenAI API. Contribute to openai/openai-openapi development by creating an account on GitHub.
This OpenAI plugin enables opencode to use ChatGPT Plus/Pro OAuth authentication to access OpenAI's Codex backend, eliminating the need for API credits.
The plugin handles automatic token refresh, fetches latest Codex instructions from GitHub, and provides full tool support with automatic remapping between Codex and opencode tools. Users must have an active ChatGPT Plus or Pro subscription and configure the plugin in their opencode.json file to use the gpt-5-codex model.