The new Codex has been revealed to restrict third-party APIs, causing live maps and online tools to disappear.

According to a Dynamis Beating analysis, developer Lao Ye's reverse engineering indicates that the new version of Codex will identify model service providers. After integrating with a third-party API, the client may no longer load tools such as lifelike images and online search. The model itself remains unchanged, with the difference being in the client's capabilities.

Based on their testing, specifying the Provider name as OpenAI can restore some functionality but will enable remote conversation compression. Extended conversations will trigger an additional call to `/responses/compact`, potentially causing timeouts at the relay station.

Another approach is to maintain a custom Provider and include the `x-openai-actor-authorization` request header. Testing code from the Codex open source project indicates that this configuration can re-enable web search and lifelike image tools.

The Codex CLI and app-server have been open-sourced, but the core desktop client remains closed source. The current "stealth IQ reduction" theory is still a personal reverse-engineering conclusion, and OpenAI has not yet publicly responded.