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You can ask Codex to update an existing repo to GPT-5.5. https://t.co/wbozdea03A
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View on XOpenAI Codex Now Autonomously Migrates Existing Repositories to GPT-5.5
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OpenAI added a feature to Codex, its terminal-based agentic coding (AI that autonomously writes and iterates on code) CLI, that allows it to update existing repositories to
GPT-5.5. Users can now prompt the agent to handle the refactoring and API integration required to migrate a project to the latest frontier model (the most capable AI systems available).This update addresses adoption friction by using the agent to manage the transition. It builds on the GPT-5.5 rollout and recent token efficiency gains, allowing teams to upgrade infrastructure without manual reviews. By automating the migration path, OpenAI is lowering the barrier for developers to move off legacy versions.
You can trigger the migration by asking the Codex CLI to update your repository. The agent will analyze the codebase and execute updates across multiple files. This capability is available to all users with access to the OpenAI platform and the GPT-5.5 API.
Still wondering? A few quick answers below.
OpenAI Codex is a terminal-based agentic coding tool that runs locally on your computer. Unlike standard chat assistants, it functions as an autonomous agent capable of navigating codebases, executing commands, and performing multi-step engineering tasks. It is designed to handle complex workflows like writing features, fixing bugs, and proposing pull requests directly within a developer environment.
You can update an existing repository to GPT-5.5 by prompting the Codex command-line interface to perform the migration. The agent autonomously analyzes the codebase to identify necessary changes, manages dependency updates, and refactors code to integrate the new model. This process replaces the manual effort typically required to adapt software to a new frontier model API and capabilities.
This feature is available to developers using the Codex CLI who have access to the OpenAI platform and the GPT-5.5 API. Users on paid subscription plans can utilize the tool to automate repository updates. Because Codex runs as a local agent, you must have the CLI installed via package managers like npm or Homebrew to trigger these autonomous workflows.