Codex stays open to any model with open-source harness, while Claude Code remains closed
gethackteam · x · 2026-09-13
Gergely Orosz highlights a stark philosophical split between the two leading AI labs' coding tools: Codex lets you use any model, not just OpenAI's, and its harness is open source; Claude Code is closed and locked to Anthropic models. OpenAI's Tibo explains the reasoning: coupling an open harness to one model would just spawn pointless forks changing 10 lines of code, so native multi-model support made more sense — and OpenAI benefits from the community's work too.
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