Codex Provider Switcher v1.3.0

Highlights

• Redesigned the native Windows interface around five focused views: Home, Providers, Diagnostics, Backups, and Settings.
• Added persistent CHN/ENG language switching and Light/Dark/System appearance modes.
• Added a read-only backup catalog with real timestamps, sizes, IDs, and paths.
• Improved diagnostics for the official Codex host, plugin tools, image generation, and Mobile Remote prerequisites.
• Preserved the stable OpenAI history partition, official sign-in state, and Windows Credential Manager storage.
• Hardened packaged installation with staged replacement and rollback-safe cleanup.

Important notes

• Mobile Remote diagnostics confirm local prerequisites only. Final phone pairing still requires the official Codex app and a real mobile-device test.
• Third-party image generation depends on whether the configured relay supports the Images API.
• The Windows binaries are unsigned, so Microsoft Defender SmartScreen may show a warning.

Requirements

• Windows 10 or Windows 11
• .NET 8 Desktop Runtime

Codex Provider Switcher v1.2.0

What is new

• Added a persistent CHN / ENG language selector to the native Windows GUI.
• Localized labels, status messages, dialogs, provider tests, host diagnostics,
  and validation errors in both Chinese and English.
• Improved the header and provider-action layout at the supported minimum
  window size.
• Exposed the selected language through the Windows UI Automation Toggle
  pattern and associated form fields with their visible labels.

Verified

• All provider, history, SSE, tool-calling, image, host, credential, and
  localization self-tests pass.
• Chinese and English layouts were visually checked at the default size and
  at the 680 x 520 minimum size.
• Mouse, keyboard, and UI Automation language switching persist through
  settings.json and restore on the next launch.

Boundaries

• Provider switching, Credential Manager key storage, and the stable chat
  history partition are unchanged.
• Plugin OAuth and mobile Remote pairing still depend on the official Codex
  and ChatGPT apps and have the same boundaries documented in v1.1.0.
• The release is unsigned and requires the .NET 8 Windows Desktop Runtime.

Codex Provider Switcher v1.1.0

What's new

• Added official-host diagnostics for ChatGPT login, Apps, plugins, Remote, and image generation.
• Added end-to-end third-party probes for Responses SSE, function-call/tool-output replay, and Codex's current /v1/images/generations backend.
• Added full image decoding and bounded response reads before a generated image can pass validation.
• Added a shortcut to the official Codex Connections page for mobile Remote pairing.
• Preserved successful tool and image results only for the exact endpoint/model that passed.
• Removed blanket termination of unrelated WSL codex app-server processes during restart.

Verified

• The official ChatGPT login and required host feature flags remained enabled while the third-party route was active.
• The configured third-party endpoint completed Responses text streaming and a stateless function-call/tool-output round trip.
• A real Images API request generated a fully decoded and visually inspected 1254 x 1254 PNG.
• The packaged installer, installed binaries, desktop shortcut, and chat-history partition were checked on Windows.

Boundaries

• Mobile Remote still requires QR pairing in the official ChatGPT desktop and mobile apps with the same account and workspace.
• Individual plugins can still require their own OAuth connection and permission approval.
• This release is unsigned and requires the .NET 8 Windows Desktop Runtime.

Codex Provider Switcher v1.0.0

Changelog

All notable changes to this project are documented here.

[1.0.0] - 2026-07-24

Added

• Native Windows WPF interface for switching Codex between the existing
  ChatGPT login and a Responses API-compatible third-party endpoint.
• Stable model_provider identity so both routes use the same Codex history
  partition.
• Windows Credential Manager storage for the third-party API key.
• Automatic config.toml backups before every switch.
• Responses API authentication and SSE compatibility test.
• Optional Codex restart after switching.
• Desktop shortcut installer.

Known limitations

• Third-party mode does not yet guarantee Codex official plugins, image
  generation, or mobile Remote support.
• The release is unsigned and may show a Windows SmartScreen warning.
• The third-party endpoint must implement the OpenAI Responses API with SSE
  streaming.