We solved AI API interoperability

LLM-Bridge is an open-source TypeScript library created by Supermemory to address the complexity of supporting incompatible OpenAI, Anthropic, and Gemini API formats in services such as its Infinite Chat context-extension proxy. It defines a universal representation for LLM requests that supports lossless conversions between provider formats, preserving vendor-specific fields, multimodal content, tool definitions, and other capabilities while allowing middleware to inspect, modify, reroute, or enrich requests through a standardized normalize-process-emit workflow. The package also provides unified error translation, token-counting and other utilities, enabling use cases such as cross-provider routing, failover, load balancing, cost optimization, multimodal processing, and summarization with cheaper models without requiring users to change SDKs or client interfaces. Supermemory reports that it uses the library internally, that it has extensive Vitest coverage, and that the project was developed with assistance from Claude Code.

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