MiMo-V2.6-Pro API: Xiaomi's 1M-context model now reads images

MiMo-V2.6-Pro adds image input to Xiaomi's long-context model. It went live on FastMetal on September 23, 2026, as mimo-v2.6-pro, and replaces MiMo-V2.5-Pro, which only took text.

FastMetal no longer serves MiMo-V2.5-Pro (it was retired on October 21, 2026). Use V2.6-Pro in its place; the rest of what we serve is in the model catalog.

What it supports

• A 1,048,576-token context and up to 131,072 output tokens.
• Text and images in the same request.
• Tool calling and structured output.
• A settable reasoning effort through the reasoning parameter, from shallow to deep.
• No training on your prompts. We confirmed that it answers with training opted out.

When it launched, the public arena leaderboard had no V2.6 entry yet (as of September 23, 2026); only V2.5-Pro had public results. Rankings move with every update, so check our rankings by use case for the current picture.

Where it fits

A long context and image input make it a good match for large document sets, including ones full of screenshots, charts and diagrams that you can now pass as they are.

It is billed per million input and output tokens. Current rates are on the MiMo-V2.6-Pro model page.

Billing is prepaid: you load a balance by card, from $5, and you can never spend more than you loaded. See pricing.

Calling it

It is OpenAI-compatible, so existing code only needs a new model value:

curl https://api.fastmetal.ai/v1/chat/completions \
  -H "Authorization: Bearer $FASTMETAL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "mimo-v2.6-pro",
    "messages": [{"role": "user", "content": "Hello"}]
  }'

To send an image, make content an array and add an image_url part:

curl https://api.fastmetal.ai/v1/chat/completions \
  -H "Authorization: Bearer $FASTMETAL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "mimo-v2.6-pro",
    "messages": [{
      "role": "user",
      "content": [
        {"type": "text", "text": "Summarize this chart."},
        {"type": "image_url", "image_url": {"url": "https://example.com/chart.png"}}
      ]
    }]
  }'

Everything else we serve is in the model catalog.