One SSE for four LLMs: streaming OpenAI, Anthropic, DeepSeek, and Kimi through one backend

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Summary

This article explains how to stream responses from OpenAI, Anthropic, DeepSeek, and Kimi through one SSE backend. It shows how to handle different event formats, including delta content, usage data, and completion signals. It also covers UTF-8 handling, buffering, and chunk parsing issues that can break SSE streams. The main value is a practical integration pattern for developers building unified LLM proxy or gateway services.

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AI Software SaaS Developer Tools

Linked Companies

OpenAI
$25M to $50M
Anthropic
$10M to $25M