Codex Router External Models

Codex Router External Models

Skill by ara.so — Codex Skills collection.

Overview

Codex Router is a local credential-isolating proxy that enables Anthropic Claude, Kimi, DeepSeek, Grok, and other external models inside Codex App/CLI and Cursor. It:

• Merges external models into the native Codex picker
• Isolates API keys and OAuth sessions per provider
• Preserves existing Codex GPT models, profiles, and ChatGPT login
• Runs as a background service on localhost
• Supports safe migration from older versions with rollback

Targets:

• Codex App/CLI: Responses API with native catalog merge (stable)
• Cursor: Manual OpenAI-compatible base URL (experimental)

Requirements:

• Node.js 22.19+ (24 LTS recommended)
• uv or Python 3.10+ with venv
• Git (for managed checkout/rollback)
• Target app installed (Codex or Cursor)

Installation

Guided Installation (Recommended)

macOS/Linux:

curl -fsSL https://raw.githubusercontent.com/duolahypercho/codex-router/main/install.sh \
  | sh -s -- --target codex --guided

Windows PowerShell:

$installer = Join-Path $env:TEMP "codex-router-install.ps1"
Invoke-WebRequest https://raw.githubusercontent.com/duolahypercho/codex-router/main/install.ps1 -OutFile $installer
powershell.exe -NoProfile -ExecutionPolicy Bypass -File $installer -Target codex -Guided

The guided installer:

• Detects existing authentication (OAuth sessions, API keys)
• Prompts invisibly for new API keys (no echo)
• Installs background service
• Verifies all layers
• Never makes paid test requests unless --smoke-test is explicitly added

Manual Clone

git clone https://github.com/duolahypercho/codex-router.git
cd codex-router

Key Commands

All commands use ./bin/model-router (or ./model-router.ps1 on Windows).

Provider Management

# List all providers and their status
./bin/model-router codex providers

# Enable a provider
./bin/model-router codex providers enable deepseek
./bin/model-router codex providers enable kimi-oauth

# Disable a provider
./bin/model-router codex providers disable anthropic-api

# Set API key (invisible prompt)
./bin/model-router codex provider-key deepseek set
./bin/model-router codex provider-key anthropic-api set
./bin/model-router codex provider-key ollama-cloud set

# Remove API key
./bin/model-router codex provider-key deepseek remove

Diagnostics

# Run comprehensive health check
./bin/model-router codex doctor

# Refresh merged catalog (after provider changes)
./bin/refresh-catalog

# Check service status
./bin/model-router codex status

Model Curation (Catalog-Only Providers)

For providers without preselected models (Groq, OpenRouter, Together AI, etc.):

# Add provider key
./bin/model-router codex provider-key groq set

# Curate models from live catalog
./bin/curate-models groq

# Test a curated model before using
./bin/test-model 'groq/llama-3.3-70b-versatile' --live --yes

Control Commands

# Toggle authentication mode
./bin/control auth-mode on   # Require native GPT models
./bin/control auth-mode off  # Allow external-only usage

# Restart service
./bin/model-router codex restart

Configuration

Codex Integration

The installer adds these blocks to ~/.codex/config.toml:

# BEGIN codex-router-managed
openai_base_url = "http://127.0.0.1:4102/_codex-router/<capability-token>/v1"
model_catalog_json = "/absolute/path/.codex/codex-router/merged-models.json"
# END codex-router-managed

# BEGIN codex-router-provider-managed
[model_providers.codex-router]
name = "Codex Router (external models)"
base_url = "http://127.0.0.1:4102/_codex-router/<capability-token>/v1"
wire_api = "responses"
# END codex-router-provider-managed

Never edit these blocks manually. Use router commands to modify configuration.

Available Providers and Models

OAuth Providers (use existing CLI sessions):

// Kimi OAuth (requires: kimi login)
'kimi-oauth/kimi-for-coding-highspeed'  // K2.7 Coding Highspeed
'kimi-oauth/kimi-for-coding'            // K2.7 Coding
'kimi-oauth/k3'                         // Kimi K3

// Grok OAuth (requires: grok login --oauth)
'grok-oauth/grok-4.5'

API Key Providers:

// Kimi Platform (separate from OAuth)
'kimi-api/kimi-k3'

// DeepSeek
'deepseek/deepseek-v4-flash'
'deepseek/deepseek-v4-pro'

// xAI
'grok-api/grok-4.5'

// Anthropic
'anthropic-api/claude-opus-4.8'

// Ollama Cloud
'ollama-cloud/glm-5.2'
'ollama-cloud/kimi-k2.7-code'
'ollama-cloud/minimax-m3'
'ollama-cloud/deepseek-v4-pro'

// MiniMax Token Plan
'minimax-token-plan/minimax-m3'

// Qwen Plan
'qwen-plan/qwen3.7-max'
'qwen-plan/qwen3.7-plus'

// Z.ai GLM Coding Plan
'zai-coding/glm-5.2'
'zai-coding/glm-5-turbo'

Catalog-Only Providers (curate models manually):

• groq - Groq
• openrouter - OpenRouter
• together - Together AI
• fireworks - Fireworks AI
• cerebras - Cerebras
• mistral - Mistral AI
• nvidia-nim - NVIDIA NIM
• siliconflow - SiliconFlow
• huggingface - Hugging Face Router
• gemini-api - Google Gemini API

Environment Variables

Override provider base URLs:

# Qwen regional endpoint
export QWEN_PLAN_BASE_URL="https://dashscope-intl.aliyuncs.com/compatible-mode/v1"

# Groq custom gateway
export GROQ_BASE_URL="https://custom-groq-endpoint.example.com/v1"

State directory override:

export CODEX_ROUTER_STATE_DIR="$HOME/.codex/codex-router"

Real Usage Examples

Setting Up DeepSeek

# Enable provider
./bin/model-router codex providers enable deepseek

# Add API key (get from platform.deepseek.com)
./bin/model-router codex provider-key deepseek set
# Paste key at invisible prompt: sk-...

# Verify
./bin/model-router codex providers
# Should show: deepseek [SHOW] ready

# Refresh catalog and restart Codex
./bin/refresh-catalog
# Quit Codex completely, reopen
# New task → Model picker → DeepSeek V4 Flash/Pro should appear

Setting Up Kimi OAuth

# Install official Kimi CLI if not present
npm install -g @moonshot-ai/kimi-code

# Authenticate with Kimi
kimi login

# Enable OAuth provider in router
./bin/model-router codex providers enable kimi-oauth

# Verify credential detection
./bin/model-router codex providers
# Should show: kimi-oauth [SHOW] ready (OAuth)

# Refresh and restart
./bin/refresh-catalog
# Quit Codex, reopen → K2.7 models appear

Setting Up Grok with Search Tools

# Install official Grok CLI
npm install -g @xai-official/grok

# OAuth login
grok login --oauth

# Enable in router
./bin/model-router codex providers enable grok-oauth

# Verify
./bin/model-router codex doctor
# Should pass Grok OAuth checks

# Models will include web_search and x_search tools automatically

Curating Groq Models

# Add Groq API key
./bin/model-router codex provider-key groq set

# Interactive curation
./bin/curate-models groq
# Shows available models from Groq's live catalog
# Select desired models (e.g., llama-3.3-70b-versatile, mixtral-8x7b)

# Test before production use
./bin/test-model 'groq/llama-3.3-70b-versatile' --live --yes

# Refresh catalog
./bin/refresh-catalog

Managing Multiple Providers

# Enable multiple providers
./bin/model-router codex providers enable deepseek
./bin/model-router codex providers enable anthropic-api
./bin/model-router codex providers enable ollama-cloud

# Set all keys
./bin/model-router codex provider-key deepseek set
./bin/model-router codex provider-key anthropic-api set
./bin/model-router codex provider-key ollama-cloud set

# Check configuration
./bin/model-router codex providers
# All should show [SHOW] ready

# Run doctor
./bin/model-router codex doctor

Separate Cursor Configuration

Cursor uses independent state:

# Enable provider for Cursor target
./bin/model-router cursor providers enable deepseek

# Set key (separate from Codex)
./bin/model-router cursor provider-key deepseek set

# Check Cursor-specific status
./bin/model-router cursor providers
./bin/model-router cursor doctor

Common Patterns

Post-Installation Checklist

# 1. Run doctor
./bin/model-router codex doctor
# Resolve any FAIL lines

# 2. Verify providers
./bin/model-router codex providers
# Ensure intended providers show [SHOW] ready

# 3. Refresh catalog
./bin/refresh-catalog

# 4. Fully quit Codex (Cmd+Q / Alt+F4)

# 5. Reopen Codex, create new task, open model picker
# External models should appear

Rotating API Keys

# Remove old key
./bin/model-router codex provider-key deepseek remove

# Add new key
./bin/model-router codex provider-key deepseek set

# Restart service
./bin/model-router codex restart

Disabling External Models Temporarily

# Disable all external providers
./bin/model-router codex providers disable deepseek
./bin/model-router codex providers disable kimi-oauth
./bin/model-router codex providers disable anthropic-api

# Refresh catalog (will only show native GPT models)
./bin/refresh-catalog

# Re-enable later
./bin/model-router codex providers enable deepseek
./bin/refresh-catalog

Checking Quota/Rate Limits

The router automatically parses rate limit headers:

// Most providers send x-ratelimit-* headers
// Anthropic sends anthropic-ratelimit-* headers
// Router displays this on quota cards after first request

// No separate API call needed
// No extra configuration required
// Just use a model once and limits appear

Troubleshooting

Models Not Appearing in Picker

# 1. Verify catalog path in config
cat ~/.codex/config.toml | grep model_catalog_json
# Should point to merged-models.json in router state dir

# 2. Check merged catalog exists
ls -lh ~/.codex/codex-router/merged-models.json

# 3. Refresh catalog
./bin/refresh-catalog

# 4. Verify providers are ready
./bin/model-router codex providers
# All enabled providers should show [SHOW] ready

# 5. Fully quit Codex
# macOS: Cmd+Q (not just close window)
# Windows: Alt+F4 or quit from system tray

# 6. Reopen Codex, create NEW task
# Model picker loads catalog at startup only

Windows WSL Configuration Mismatch

When Codex Desktop runs on Windows but commands execute in WSL:

# Point to Windows Codex home from WSL
export CODEX_HOME=/mnt/c/Users/<WindowsUser>/.codex
export CODEX_ROUTER_STATE_DIR="$CODEX_HOME/codex-router"

# Verify config uses WSL-readable path
grep model_catalog_json /mnt/c/Users/<WindowsUser>/.codex/config.toml
# Should be: /mnt/c/Users/.../merged-models.json
# NOT: C:\Users\...\merged-models.json

# Return to authenticated mode
./bin/control auth-mode off

OAuth Session Expired

# Kimi OAuth
kimi login
./bin/model-router codex doctor  # Should pass kimi-oauth checks

# Grok OAuth
grok login --oauth
./bin/model-router codex doctor  # Should pass grok-oauth checks

Provider Shows "Not Ready"

# Check provider details
./bin/model-router codex providers

# If API key provider: ensure key is set
./bin/model-router codex provider-key <provider> set

# If OAuth provider: ensure CLI login succeeded
kimi login status  # for Kimi
grok login --status  # for Grok

# Run full diagnostic
./bin/model-router codex doctor

Service Not Running

# Check status
./bin/model-router codex status

# Restart service
./bin/model-router codex restart

# Check logs
tail -f ~/.codex/codex-router/logs/service.log

Catalog Merge Fails

# Reset to native GPT models only
./bin/control auth-mode on
./bin/refresh-catalog

# Verify base catalog
cat ~/.codex/codex-router/native-models.json

# Re-enable external providers one by one
./bin/model-router codex providers enable deepseek
./bin/refresh-catalog
# Check for errors

./bin/model-router codex providers enable anthropic-api
./bin/refresh-catalog

Testing Individual Models

# Live test (makes real API call)
./bin/test-model 'deepseek/deepseek-v4-flash' --live --yes

# Dry run (validates configuration only)
./bin/test-model 'kimi-oauth/k3'

Regional Endpoint Configuration

# Qwen Singapore region (default)
# No config needed

# Qwen other regions
export QWEN_PLAN_BASE_URL="https://dashscope.aliyuncs.com/compatible-mode/v1"
./bin/model-router codex restart

# Verify in next request

Removing Router Completely

# Disable all providers
./bin/model-router codex providers | grep SHOW | while read provider _; do
  ./bin/model-router codex providers disable "$provider"
done

# Remove managed blocks from config.toml
# (Manual edit or use provided uninstall script)

# Stop service
./bin/model-router codex stop

# Remove state directory
rm -rf ~/.codex/codex-router

Migration from Older Versions

The installer auto-detects and migrates recognized older configurations. To rollback:

# Rollback uses Git history
cd codex-router
git log --oneline  # Find previous commit
git checkout <commit-hash>
./bin/model-router codex restart

Best Practices

1. Always run doctor after changes: ./bin/model-router codex doctor
2. Fully quit Codex after catalog refresh: Catalog loads at startup only
3. Use invisible prompts for keys: Never paste keys in chat/logs
4. Test curated models before production: ./bin/test-model --live --yes
5. Keep providers enabled only when needed: Reduces picker clutter
6. Use separate credentials per target: Codex and Cursor state is independent
7. Check quota cards after first use: No extra config needed for rate limits
8. Verify OAuth sessions periodically: kimi login status, grok login --status