Chinese AI model Kimi K3 has been integrated into OpenAI's Codex coding tool through U.S. infrastructure provider Baseten, marking the first entry of a Chinese open-source model into OpenAI's enterprise billing system. Enterprise users can now access Kimi K3 directly within Codex without establishing new vendor relationships. Usage fees for Kimi K3 are billed against existing OpenAI procurement commitments, streamlining adoption for enterprise customers already utilizing OpenAI services. This integration represents a significant milestone for Chinese AI models gaining access to mainstream Western enterprise distribution channels.