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Codex CLI supports custom model providers through ~/.codex/config.toml, so you can route requests to AI Stats without changing your local workflow.

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Prerequisites

  • An AI Stats API key.
  • Codex CLI installed locally.

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1) Set your API key

export AI_STATS_API_KEY="your_ai_stats_api_key"

$env:AI_STATS_API_KEY = "your_ai_stats_api_key"

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2) Configure Codex to use AI Stats

Create or update ~/.codex/config.toml: 
model = "openai/gpt-5-3-codex-2026-02-05"
model_provider = "ai_stats"

[model_providers.ai_stats]
name = "AI Stats"
base_url = "https://api.phaseo.app/v1"
env_key = "AI_STATS_API_KEY"
wire_api = "responses"

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3) Start Codex

codex

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Verification

  • Confirm your model id exists in Models before launching.
  • Use Responses for the default Codex-style flow.
  • If needed for compatibility, switch wire_api to chat and use Chat Completions.

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Troubleshooting

  • 401 Unauthorized: check that AI_STATS_API_KEY is set in the same shell running codex.
  • model_not_found: fetch a current id from Models and update model.
  • Provider-specific issues: follow Routing and fallbacks for failover behavior.
Last modified on March 11, 2026