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K2 Horizon 375B-A23B vs MiMo-V2.5-Pro

K2 Horizon 375B-A23B leads the LLM Stats Score 38.5 to 25.1.

Institute of Foundation Models · Xiaomi · Updated for 2026

Which is better?

K2 Horizon 375B-A23B leads the overall LLM Stats Score 38.5 to 25.1, ranking #83 overall.

The models split the 4 individual benchmarks reported for both models evenly.

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

Choose K2 Horizon 375B-A23B

  • overall performance matters — it scores 38.5 and ranks #83 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • you want the most recent training data — it shipped Sep 2026

Choose MiMo-V2.5-Pro

  • your work emphasizes coding — it leads those capability indexes

At a glance

The differences that matter most.

K2 Horizon 375B-A23B
Institute of Foundation Models
MiMo-V2.5-Pro
Xiaomi
Core performance indexes
LLM Stats Score
38.5
#83
25.1
#187
Reasoning
37.3
#87
23.5
#193
Coding
21.2
#114
32.3
#57
Agents
23.9
#74
23.6
#79
Cost, coverage & limits
Benchmark wins
2 of 4
2 of 4
Input price
— / M
$0.43 / M
Output price
— / M
$0.87 / M
Context window
—
1,048,576

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
K2 Horizon 375B-A23B
MiMo-V2.5-Pro
Math
29.7#89
25.4#117
Tool use
22.3#62
23.1#54
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

18 reported for K2 Horizon 375B-A23B · 31 for MiMo-V2.5-Pro

4 shared

K2 Horizon 375B-A23B outperforms in 2 benchmarks (GPQA, WildClawBench), while MiMo-V2.5-Pro is better at 2 benchmarks (Humanity's Last Exam, SWE-Bench Pro).

Both models are evenly matched across the benchmarks.

Fri Oct 30 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Model Size

Parameter count comparison

648.2B diff

MiMo-V2.5-Pro has 648.2B more parameters than K2 Horizon 375B-A23B, making it 172.9% larger.

Institute of Foundation Models
K2 Horizon 375B-A23B
375.0Bparameters
Xiaomi
MiMo-V2.5-Pro
1.0Tparameters
375.0B
K2 Horizon 375B-A23B
1023.2B
MiMo-V2.5-Pro

Context Window

Maximum input and output token capacity

Only MiMo-V2.5-Pro specifies input context (1,048,576 tokens). Only MiMo-V2.5-Pro specifies output context (131,072 tokens).

Institute of Foundation Models
K2 Horizon 375B-A23B
Input- tokens
Output- tokens
Xiaomi
MiMo-V2.5-Pro
Input1,048,576 tokens
Output131,072 tokens
Fri Oct 30 2026 • llm-stats.com

License

Usage and distribution terms

K2 Horizon 375B-A23B is licensed under Apache 2.0, while MiMo-V2.5-Pro uses MIT.

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

K2 Horizon 375B-A23B

Apache 2.0

Open weights

MiMo-V2.5-Pro

MIT

Open weights

Release Timeline

When each model was launched

K2 Horizon 375B-A23B was released on 2026-09-03, while MiMo-V2.5-Pro was released on 2026-04-27.

K2 Horizon 375B-A23B is 4 months newer than MiMo-V2.5-Pro.

K2 Horizon 375B-A23B

Sep 3, 2026

1 months ago

4mo newer
MiMo-V2.5-Pro

Apr 27, 2026

6 months ago

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?

Judge for yourself.

Run your own prompts against K2 Horizon 375B-A23B and MiMo-V2.5-Pro side-by-side, then vote on the output you prefer.

K2 Horizon 375B-A23B
✓ Preferred
MiMo-V2.5-Pro
Open in Playground

FAQ

Common questions about K2 Horizon 375B-A23B vs MiMo-V2.5-Pro.

Which is better, K2 Horizon 375B-A23B or MiMo-V2.5-Pro?

K2 Horizon 375B-A23B leads the LLM Stats Score 38.5 to 25.1. K2 Horizon 375B-A23B is made by Institute of Foundation Models and MiMo-V2.5-Pro is made by Xiaomi. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does K2 Horizon 375B-A23B compare to MiMo-V2.5-Pro in benchmarks?

K2 Horizon 375B-A23B scores GPQA: 87.3%, AA-LCR: 76.0%, OmniScience (non-hallucination rate): 74.7%, BrowseComp: 72.8%, Terminal-Bench 2.1: 70.2%. MiMo-V2.5-Pro scores FrontierSWE (Impl.): 100.0%, GSM8k: 99.6%, ARC-C: 97.2%, MMLU-Redux: 92.8%, C-Eval: 91.5%.

What are the context window sizes for K2 Horizon 375B-A23B and MiMo-V2.5-Pro?

K2 Horizon 375B-A23B supports an unknown number of tokens and MiMo-V2.5-Pro supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between K2 Horizon 375B-A23B and MiMo-V2.5-Pro?

Key differences include LLM Stats Score (38.5 vs 25.1), licensing (Apache 2.0 vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes K2 Horizon 375B-A23B and MiMo-V2.5-Pro?

K2 Horizon 375B-A23B is developed by Institute of Foundation Models and MiMo-V2.5-Pro is developed by Xiaomi.

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