OpenAI integrates open models like GLM-5.3 in Codex
Summary
OpenAI has enabled enterprise teams to use open models such as GLM-5.3 Flash and Kimi K3 within Codex, allowing them to count their spending against existing OpenAI commitments. This development follows Baseten's partnership with OpenAI, making Baseten one of the first providers of open-model inference in the OpenAI B2B Marketplace, which features native integration with Codex.
Analysis
OpenAI: OpenAI develops and deploys advanced AI models and platforms for enterprise and developer use, including coding tools like Codex. The company maintains B2B commitments and marketplaces that allow customers to access third-party inference providers. In this news, OpenAI's enterprise billing and Codex integration now support open models served externally through partners. Philip Kiely: Philip Kiely leads software developer relations at Baseten and focuses on inference engineering and multi-model AI strategies for production systems. He authors content on building AI-native applications that combine multiple models beyond single-provider wrappers. Kiely highlighted the OpenAI integration in a recent announcement about open models in Codex. Partnership: Baseten has partnered with OpenAI as one of the first open-model inference providers in the OpenAI B2B Marketplace with native Codex integration. Enterprise Access: OpenAI enterprise customers can apply existing commitments to open models from partners like Baseten within Codex or via the Responses API.
Categories
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Related sources
- https://se-radio.net/2025/12/se-radio-697-philip-kiely-on-multi-model-ai/
- https://playground.roboflow.com/models/compare/glm-5-3-flash-vs-kimi-k3
- https://www.together.ai/models/glm-5-3-flash
- https://www.marktechpost.com/2026/08/26/z-ai-releases-glm-5-3-flash-a-320b-a18b-natively-multimodal-moe-with-a-1m-token-context/
- https://huggingface.co/zai-org/GLM-5.3-Flash
- https://www.linkedin.com/in/philipkiely
- https://x.com/i/user/1070356464873758720
- https://x.com/philipkiely/status/2105000178709360963
- https://x.com/i/user/478214688
- https://www.podscan.fm/podcasts/software-engineering-radio-the-podcast-for-professional-software-developers/episodes/se-radio-697-philip-kiely-on-multi-model-ai-1
- https://daily.dev/posts/ox-alpha-was-glm-5-3-flash-all-along-and-it-s-live-in-kilo-zg9ogsq1w
- https://x.com/i/user/133238723