I thought the tool format wasnt exactly the same ? So plugging any IA into claude code requires a conversion of format

DeepSeek has a dedicated Anthropic-compatible endpoint [1].

[1] https://api-docs.deepseek.com/guides/anthropic_api

This one still lacks some features. They still recommend using their OpenAI compatible endpoint.

But I guess Anthropic is just not capable of implementing the OpenAI API compatible client in Claude Code.

Many of them expose “anthropic-compatible” APIs for this very purpose.

qwen also offers openai compatible endpoint.