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Grok 4 Fast vs MiMo-V2.6-Flash

MiMo-V2.6-Flash leads the LLM Stats Score 45.7 to 31.7.

xAI · Xiaomi · Updated for 2026

Which is better?

MiMo-V2.6-Flash leads the overall LLM Stats Score 45.7 to 31.7, ranking #29 overall.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Grok 4 Fast

  • you want predictable pricing at $0.20/M input and $0.50/M output

Choose MiMo-V2.6-Flash

  • overall performance matters — it scores 45.7 and ranks #29 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you want the most recent training data — it shipped Sep 2026
  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

Grok 4 Fast
xAI
MiMo-V2.6-Flash
Xiaomi
Core performance indexes
LLM Stats Score
31.7
#113
45.7
#29
Reasoning
30.7
#117
43.2
#42
Coding
18.1
#115
36.6
#21
Agents
3.0
#164
33.3
#25
Cost, coverage & limits
Benchmark wins
—
—
Input price
$0.20 / M
— / M
Output price
$0.50 / M
— / M
Context window
2,000,000
—

Individual benchmarks

7 reported for Grok 4 Fast · 16 for MiMo-V2.6-Flash

No common benchmarks found

Grok 4 Fast and MiMo-V2.6-Flashdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Grok 4 Fast specifies input context (2,000,000 tokens). Only Grok 4 Fast specifies output context (30,000 tokens).

xAI
Grok 4 Fast
Input2,000,000 tokens
Output30,000 tokens
Xiaomi
MiMo-V2.6-Flash
Input- tokens
Output- tokens
Mon Sep 21 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Grok 4 Fast and MiMo-V2.6-Flash support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Grok 4 Fast

Text
Images
Audio
Video

MiMo-V2.6-Flash

Text
Images
Audio
Video

License

Usage and distribution terms

Grok 4 Fast is licensed under a proprietary license, while MiMo-V2.6-Flash uses MIT.

License differences may affect how you can use these models in commercial or open-source projects.

Grok 4 Fast

Proprietary

Closed source

MiMo-V2.6-Flash

MIT

Open weights

Release Timeline

When each model was launched

Grok 4 Fast was released on 2025-08-28, while MiMo-V2.6-Flash was released on 2026-09-22.

MiMo-V2.6-Flash is 13 months newer than Grok 4 Fast.

Grok 4 Fast

Aug 28, 2025

1.1 years ago

MiMo-V2.6-Flash

Sep 22, 2026

-1 days ago

1.1yr newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Grok 4 Fast and MiMo-V2.6-Flash side-by-side, then vote on the output you prefer.

Grok 4 Fast
✓ Preferred
MiMo-V2.6-Flash
Open in Playground

FAQ

Common questions about Grok 4 Fast vs MiMo-V2.6-Flash.

Which is better, Grok 4 Fast or MiMo-V2.6-Flash?

MiMo-V2.6-Flash leads the LLM Stats Score 45.7 to 31.7. Grok 4 Fast is made by xAI and MiMo-V2.6-Flash is made by Xiaomi. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Grok 4 Fast compare to MiMo-V2.6-Flash in benchmarks?

Grok 4 Fast scores SimpleQA: 95.0%, HMMT 2025: 93.3%, AIME 2025: 92.0%, GPQA: 85.7%, LiveCodeBench: 80.0%. MiMo-V2.6-Flash scores CyberGym: 95.1%, Terminal-Bench 2.1: 87.6%, OSWorld-Verified: 80.8%, MiMo Cyber Bench: 77.2%, Toolathlon-Verified: 73.6%.

What are the context window sizes for Grok 4 Fast and MiMo-V2.6-Flash?

Grok 4 Fast supports 2.0M tokens and MiMo-V2.6-Flash supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Grok 4 Fast and MiMo-V2.6-Flash?

Key differences include LLM Stats Score (31.7 vs 45.7), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok 4 Fast and MiMo-V2.6-Flash?

Grok 4 Fast is developed by xAI and MiMo-V2.6-Flash is developed by Xiaomi.

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