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Grok-4 Fast Reasoning vs MiMo-V2.6-Flash

Comparing Grok-4 Fast Reasoning and MiMo-V2.6-Flash across benchmarks, pricing, and capabilities.

xAI · Xiaomi · Updated for 2026

Which is better?

Grok-4 Fast Reasoning and MiMo-V2.6-Flash trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

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

Choose Grok-4 Fast Reasoning

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

Choose MiMo-V2.6-Flash

  • 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 Reasoning
xAI
MiMo-V2.6-Flash
Xiaomi
Benchmark wins
—
—
Input price
$0.20 / M
— / M
Output price
$0.50 / M
— / M
Context window
2,000,000
—

Individual benchmarks

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

No common benchmarks found

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

xAI
Grok-4 Fast Reasoning
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 Reasoning 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 Reasoning

Text
Images
Audio
Video

MiMo-V2.6-Flash

Text
Images
Audio
Video

License

Usage and distribution terms

Grok-4 Fast Reasoning 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 Reasoning

Proprietary

Closed source

MiMo-V2.6-Flash

MIT

Open weights

Release Timeline

When each model was launched

Grok-4 Fast Reasoning 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 Reasoning.

Grok-4 Fast Reasoning

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 Reasoning and MiMo-V2.6-Flash side-by-side, then vote on the output you prefer.

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

FAQ

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

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

Grok-4 Fast Reasoning (xAI) and MiMo-V2.6-Flash (Xiaomi) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

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

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 Reasoning and MiMo-V2.6-Flash?

Grok-4 Fast Reasoning 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 Reasoning and MiMo-V2.6-Flash?

Key differences include licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

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

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

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