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Claude Opus 4.1 vs K2 Horizon MoVA 36B-A4B

Claude Opus 4.1 and K2 Horizon MoVA 36B-A4B are closely matched at 29.3 and 29.8 on the LLM Stats Score.

Anthropic · Institute of Foundation Models · Updated for 2026

Which is better?

Claude Opus 4.1 and K2 Horizon MoVA 36B-A4B are closely matched on the overall LLM Stats Score at 29.3 and 29.8.

In the 1 individual benchmarks reported for both models, Claude Opus 4.1 wins 1; this is a narrower head-to-head signal than the composite indexes.

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

Choose Claude Opus 4.1

  • you value its reported benchmark strengths — it wins 1 of 1 exact shared results

Choose K2 Horizon MoVA 36B-A4B

  • 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.

Claude Opus 4.1
Anthropic
K2 Horizon MoVA 36B-A4B
Institute of Foundation Models
Core performance indexes
LLM Stats Score
29.3
#154
29.8
#149
Reasoning
29.4
#151
29.7
#148
Coding
21.5
#110
13.9
#163
Agents
12.5
#130
14.5
#116
Cost, coverage & limits
Benchmark wins
1 of 1
0 of 1
Input price
$15.00 / M
— / M
Output price
$75.00 / M
— / M
Context window
200,000
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
Claude Opus 4.1
K2 Horizon MoVA 36B-A4B
Math
22.6#148
21.8#156
Tool use
18.2#89
11.9#132
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

8 reported for Claude Opus 4.1 · 9 for K2 Horizon MoVA 36B-A4B

1 shared

Claude Opus 4.1 outperforms in 1 benchmarks (GPQA), while K2 Horizon MoVA 36B-A4B is better at 0 benchmarks.

Claude Opus 4.1 significantly outperforms across most benchmarks.

Fri Oct 30 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Claude Opus 4.1 specifies input context (200,000 tokens). Only Claude Opus 4.1 specifies output context (32,000 tokens).

Anthropic
Claude Opus 4.1
Input200,000 tokens
Output32,000 tokens
Institute of Foundation Models
K2 Horizon MoVA 36B-A4B
Input- tokens
Output- tokens
Fri Oct 30 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Claude Opus 4.1 supports multimodal inputs, whereas K2 Horizon MoVA 36B-A4B does not.

Claude Opus 4.1 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Opus 4.1

Text
Images
Audio
Video

K2 Horizon MoVA 36B-A4B

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Opus 4.1 is licensed under a proprietary license, while K2 Horizon MoVA 36B-A4B uses Apache 2.0.

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

Claude Opus 4.1

Proprietary

Closed source

K2 Horizon MoVA 36B-A4B

Apache 2.0

Open weights

Release Timeline

When each model was launched

Claude Opus 4.1 was released on 2025-08-05, while K2 Horizon MoVA 36B-A4B was released on 2026-09-03.

K2 Horizon MoVA 36B-A4B is 13 months newer than Claude Opus 4.1.

Claude Opus 4.1

Aug 5, 2025

1.2 years ago

K2 Horizon MoVA 36B-A4B

Sep 3, 2026

1 months 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?

Judge for yourself.

Run your own prompts against Claude Opus 4.1 and K2 Horizon MoVA 36B-A4B side-by-side, then vote on the output you prefer.

Claude Opus 4.1
✓ Preferred
K2 Horizon MoVA 36B-A4B
Open in Playground

FAQ

Common questions about Claude Opus 4.1 vs K2 Horizon MoVA 36B-A4B.

Which is better, Claude Opus 4.1 or K2 Horizon MoVA 36B-A4B?

Claude Opus 4.1 and K2 Horizon MoVA 36B-A4B are closely matched on the LLM Stats Score at 29.3 and 29.8. Claude Opus 4.1 is made by Anthropic and K2 Horizon MoVA 36B-A4B is made by Institute of Foundation Models. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Opus 4.1 compare to K2 Horizon MoVA 36B-A4B in benchmarks?

Claude Opus 4.1 scores MMMLU: 89.5%, TAU-bench Retail: 82.4%, GPQA: 80.9%, AIME 2025: 78.0%, MMMU (validation): 77.1%. K2 Horizon MoVA 36B-A4B scores GPQA: 80.8%, OmniScience (non-hallucination rate): 69.2%, AA-LCR: 66.3%, Terminal-Bench 2.1: 58.6%, SciCode: 38.9%.

What are the context window sizes for Claude Opus 4.1 and K2 Horizon MoVA 36B-A4B?

Claude Opus 4.1 supports 200K tokens and K2 Horizon MoVA 36B-A4B 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 Claude Opus 4.1 and K2 Horizon MoVA 36B-A4B?

Key differences include LLM Stats Score (29.3 vs 29.8), multimodal support (yes vs no), licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 4.1 and K2 Horizon MoVA 36B-A4B?

Claude Opus 4.1 is developed by Anthropic and K2 Horizon MoVA 36B-A4B is developed by Institute of Foundation Models.

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