Model Comparison

Grok 4 Fast vs MiMo-V2-Flash

MiMo-V2-Flash has a slight edge in benchmark performance. MiMo-V2-Flash is 1.8x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

5 benchmarks

Grok 4 Fast outperforms in 2 benchmarks (GPQA, HMMT 2025), while MiMo-V2-Flash is better at 3 benchmarks (AIME 2025, BrowseComp, Humanity's Last Exam).

MiMo-V2-Flash has a slight edge in benchmark performance.

Fri May 29 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

MiMo-V2-Flash costs less

For input processing, Grok 4 Fast ($0.20/1M tokens) is 2.0x more expensive than MiMo-V2-Flash ($0.10/1M tokens).

For output processing, Grok 4 Fast ($0.50/1M tokens) is 1.7x more expensive than MiMo-V2-Flash ($0.30/1M tokens).

In conclusion, Grok 4 Fast is more expensive than MiMo-V2-Flash.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Fri May 29 2026 • llm-stats.com
xAI
Grok 4 Fast
Input tokens$0.20
Output tokens$0.50
Best providerxAI
Xiaomi
MiMo-V2-Flash
Input tokens$0.10
Output tokens$0.30
Best providerXiaomi
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Context Window

Maximum input and output token capacity

Grok 4 Fast accepts 2,000,000 input tokens compared to MiMo-V2-Flash's 256,000 tokens. Grok 4 Fast can generate longer responses up to 30,000 tokens, while MiMo-V2-Flash is limited to 16,384 tokens.

xAI
Grok 4 Fast
Input2,000,000 tokens
Output30,000 tokens
Xiaomi
MiMo-V2-Flash
Input256,000 tokens
Output16,384 tokens
Fri May 29 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Grok 4 Fast supports multimodal inputs, whereas MiMo-V2-Flash does not.

Grok 4 Fast can handle both text and other forms of data like images, making it suitable for multimodal applications.

Grok 4 Fast

Text
Images
Audio
Video

MiMo-V2-Flash

Text
Images
Audio
Video

License

Usage and distribution terms

Grok 4 Fast is licensed under a proprietary license, while MiMo-V2-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-Flash

MIT

Open weights

Release Timeline

When each model was launched

Grok 4 Fast was released on 2025-08-28, while MiMo-V2-Flash was released on 2025-12-16.

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

Grok 4 Fast

Aug 28, 2025

9 months ago

MiMo-V2-Flash

Dec 16, 2025

5 months ago

3mo 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

Provider Availability

Grok 4 Fast is available from xAI. MiMo-V2-Flash is available from Xiaomi.

Grok 4 Fast

xai logo
xAI
Input Price:Input: $0.20/1MOutput Price:Output: $0.50/1M

MiMo-V2-Flash

xiaomi logo
Xiaomi
Input Price:Input: $0.10/1MOutput Price:Output: $0.30/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

xAI
Larger context window (2,000,000 tokens)
Supports multimodal inputs
Higher GPQA score (85.7% vs 83.7%)
Higher HMMT 2025 score (93.3% vs 84.4%)
Xiaomi
Less expensive input tokens
Less expensive output tokens
Has open weights
Higher AIME 2025 score (94.1% vs 92.0%)
Higher BrowseComp score (58.3% vs 44.9%)
Higher Humanity's Last Exam score (22.1% vs 20.0%)

Detailed Comparison

AI Model Comparison Table
Feature
xAI
Grok 4 Fast
Xiaomi
MiMo-V2-Flash

FAQ

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

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

MiMo-V2-Flash has a slight edge in benchmark performance. Grok 4 Fast is made by xAI and MiMo-V2-Flash is made by Xiaomi. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Grok 4 Fast compare to MiMo-V2-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-Flash scores AIME 2025: 94.1%, Arena-Hard v2: 86.2%, MMLU-Pro: 84.9%, HMMT 2025: 84.4%, GPQA: 83.7%.

Is Grok 4 Fast cheaper than MiMo-V2-Flash?

MiMo-V2-Flash is 2.0x cheaper for input tokens. Grok 4 Fast costs $0.20/M input and $0.50/M output via xai. MiMo-V2-Flash costs $0.10/M input and $0.30/M output via xiaomi.

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

Grok 4 Fast supports 2.0M tokens and MiMo-V2-Flash supports 256K 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-Flash?

Key differences include context window (2.0M vs 256K), input pricing ($0.20 vs $0.10/M), multimodal support (yes vs no), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

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

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