Simon Willison • 11/7/2025

Using Codex CLI with gpt-oss:120b on an NVIDIA DGX Spark via Tailscale

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This technical blog post details how to configure and use OpenAI's Codex CLI coding agent with the gpt-oss:120b model running locally in Ollama on an NVIDIA DGX Spark. The setup uses a Tailscale network to allow the author to run the Codex CLI from their laptop anywhere in the world against this self-hosted model, demonstrating its use by building a Space Invaders clone.

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#Ollama #Codex CLI #Local Llms
Using Codex CLI with gpt-oss:120b on an NVIDIA DGX Spark via Tailscale

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