Xiaomi's MiMo models are served at https://api.xiaomimimo.com/v1 with an OpenAI-compatible chat API. The key goes in an api-key header rather than Authorization.
Create a key on the MiMo open platform and send it as the api-key header. In the examples it's written {{MIMO_API_KEY}}.
Full reference: https://mimo.mi.com/docs/en-US/quick-start/summary/first-api-call
curl https://api.xiaomimimo.com/v1/chat/completions \
-H "api-key: {{MIMO_API_KEY}}" \
-H "Content-Type: application/json" \
-d '{"model": "mimo-v2.6-pro", "messages": [{"role": "user", "content": "Explain what an API rate limit is in two sentences."}]}'curl https://api.xiaomimimo.com/v1/chat/completions \
-H "api-key: {{MIMO_API_KEY}}" \
-H "Content-Type: application/json" \
-d '{"model": "mimo-v2.6-flash", "messages": [{"role": "user", "content": "Summarize HTTP/2 in one sentence."}]}'