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llm-openai-via-codex 0.1a0

Simon Willison's Blog / 4/24/2026

📰 NewsDeveloper Stack & InfrastructureTools & Practical UsageModels & Research
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Key Points

  • The release “llm-openai-via-codex 0.1a0” enables access to OpenAI models by leveraging an existing Codex CLI subscription.
  • It works by effectively reusing or hijacking the user’s Codex CLI credentials to make API calls to LLM services.
  • The project references Simon Willison’s earlier post about GPT-5.5 and a “semi-official Codex backdoor API” approach.
  • Overall, it provides a shortcut for developers who already pay for Codex to call OpenAI models without setting up separate API access.
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23rd April 2026

Release llm-openai-via-codex 0.1a0 — Access OpenAI models via an existing Codex subscription

Hijacks your Codex CLI credentials to make API calls with LLM, as described in my post about GPT-5.5.

Posted 23rd April 2026 at 7:22 pm

This is a beat by Simon Willison, posted on 23rd April 2026.

openai 409 llm 589 codex-cli 32

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