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Zeitgeist — a spike by Chris Gathercole
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  2. Simon Willison — Creator of Datasette; co-creator of Django/

CORS Chat

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  • Simon Willison developed “CORS Chat,” a new browser-based tool designed to interact directly with OpenAI Responses-compatible API endpoints that support CORS headers, providing a web UI for exercising various chat models.
  • The tool allows configuration of custom headers, local saving of conversations, and management of multiple chat sessions, and has been successfully tested with LM Studio (using the --cors option) and OpenRouter.
  • A unique feature is its ability to progressively render generated SVG images directly within the chat interface while tokens are still streaming in.
  • CORS Chat was built using GPT-5.6-Sol xhigh primarily to help test models like Qwen 3.8 27B running locally in LM Studio, offering a practical interface for developers to experiment with and debug chat API integrations.