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Figure 1: Xiaomi MiMo-V2.6-Flash-RL 309B · diagram by Sebastian Raschka · click to zoom
Sparse omnimodal MoEXiaomi 🇨🇳 · September 21, 2026

Xiaomi MiMo-V2.6-Flash-RL (309B)

Omnimodal sparse MoE model with the MiMo-V2.5 text backbone, mixed-domain reinforcement learning, and a five-layer DFlash speculative decoder.

Key detail

Uses 256 routed experts with top-8 routing, one dense prefix layer, no shared experts, and a 128-token sliding window.

Total params

309B

Active / token

15B

Context

1M

Fact sheet

Scale
309B total, 15B active (4.9% active)
Context window
1,048,576 tokens
Decoder type
Sparse omnimodal MoE
Attention
GQA with sliding-window/global attention
Layer mix
39 sliding-window + 9 global
KV cache / token (bf16)
217.5 KiB · High
License
MIT License
Released

Efficiency

Parameters active per token

4.9%

15B of 309B weights run for each token.

KV cache per token (bf16)

217.5 KiB

Smaller than 22% of models in the atlas. How it’s calculated

AA Intelligence Index v5.0

Source

26.7

Knowledge Work
44.2
Coding
22.1
Science
14.4
General
25.9

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