A step-by-step guide to configuring DeepSeek in Codex CLI, covering TOML settings, API key setup, profile switching, and practical tips for lowering AI coding costs with DeepSeek.
Codex uses OpenAI models by default, but it also lets you configure a model provider to connect third-party models. I previously tried using DeepSeek with Claude Code and found the experience reasonably good. I recently discovered that Codex supports a similar setup, so this guide documents how to configure DeepSeek in Codex.
Last updated on: Aug 6, 2026
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