Codex’s harness is fully open source and can run open-weights models
Teknium · x · 2026-07-27
Teknium says Codex is a fully open-source harness: you can audit exactly what happens to your prompt and how it works, and you can run open-weights models through it too.
The post is a direct reply to a complaint about not being able to inspect how “compaction” works, framing Codex as something transparent enough to audit rather than a black box.
Related event: OpenAI Codex Orchestration Layer Goes Fully Open Source(2 posts)→
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