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Claude 3.7 Sonnet vs K2 Horizon 7B

Claude 3.7 Sonnet and K2 Horizon 7B are closely matched at 23.4 and 25.7 on the LLM Stats Score.

Anthropic · Institute of Foundation Models · Updated for 2026

Which is better?

Claude 3.7 Sonnet and K2 Horizon 7B are closely matched on the overall LLM Stats Score at 23.4 and 25.7.

In the 1 individual benchmarks reported for both models, K2 Horizon 7B 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 3.7 Sonnet

  • you want predictable pricing at $3.00/M input and $15.00/M output

Choose K2 Horizon 7B

  • you value its reported benchmark strengths — it wins 1 of 1 exact shared results
  • 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 3.7 Sonnet
Anthropic
K2 Horizon 7B
Institute of Foundation Models
Core performance indexes
LLM Stats Score
23.4
#203
25.7
#184
Reasoning
22.5
#199
25.6
#181
Coding
13.5
#165
8.4
#209
Agents
4.4
#184
12.0
#133
Cost, coverage & limits
Benchmark wins
0 of 1
1 of 1
Input price
$3.00 / M
— / M
Output price
$15.00 / M
— / M
Context window
200,000
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
Claude 3.7 Sonnet
K2 Horizon 7B
Math
16.8#215
14.4#235
Tool use
17.8#92
8.4#164
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

11 reported for Claude 3.7 Sonnet · 8 for K2 Horizon 7B

1 shared

Claude 3.7 Sonnet outperforms in 0 benchmarks, while K2 Horizon 7B is better at 1 benchmark (SWE-Bench Verified).

K2 Horizon 7B 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 3.7 Sonnet specifies input context (200,000 tokens). Only Claude 3.7 Sonnet specifies output context (128,000 tokens).

Anthropic
Claude 3.7 Sonnet
Input200,000 tokens
Output128,000 tokens
Institute of Foundation Models
K2 Horizon 7B
Input- tokens
Output- tokens
Fri Oct 30 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Claude 3.7 Sonnet supports multimodal inputs, whereas K2 Horizon 7B does not.

Claude 3.7 Sonnet can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude 3.7 Sonnet

Text
Images
Audio
Video

K2 Horizon 7B

Text
Images
Audio
Video

License

Usage and distribution terms

Claude 3.7 Sonnet is licensed under a proprietary license, while K2 Horizon 7B uses Apache 2.0.

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

Claude 3.7 Sonnet

Proprietary

Closed source

K2 Horizon 7B

Apache 2.0

Open weights

Release Timeline

When each model was launched

Claude 3.7 Sonnet was released on 2025-02-24, while K2 Horizon 7B was released on 2026-09-03.

K2 Horizon 7B is 19 months newer than Claude 3.7 Sonnet.

Claude 3.7 Sonnet

Feb 24, 2025

1.7 years ago

K2 Horizon 7B

Sep 3, 2026

1 months ago

1.5yr 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 3.7 Sonnet and K2 Horizon 7B side-by-side, then vote on the output you prefer.

Claude 3.7 Sonnet
✓ Preferred
K2 Horizon 7B
Open in Playground

FAQ

Common questions about Claude 3.7 Sonnet vs K2 Horizon 7B.

Which is better, Claude 3.7 Sonnet or K2 Horizon 7B?

Claude 3.7 Sonnet and K2 Horizon 7B are closely matched on the LLM Stats Score at 23.4 and 25.7. Claude 3.7 Sonnet is made by Anthropic and K2 Horizon 7B 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 3.7 Sonnet compare to K2 Horizon 7B in benchmarks?

Claude 3.7 Sonnet scores MATH-500: 96.2%, IFEval: 93.2%, MMMLU: 86.1%, GPQA: 84.8%, TAU-bench Retail: 81.2%. K2 Horizon 7B scores HMMT Feb 26: 73.3%, SWE-Bench Verified: 70.6%, AA-LCR: 68.0%, BrowseComp: 59.0%, Terminal-Bench 2.1: 39.1%.

What are the context window sizes for Claude 3.7 Sonnet and K2 Horizon 7B?

Claude 3.7 Sonnet supports 200K tokens and K2 Horizon 7B 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 3.7 Sonnet and K2 Horizon 7B?

Key differences include LLM Stats Score (23.4 vs 25.7), multimodal support (yes vs no), licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude 3.7 Sonnet and K2 Horizon 7B?

Claude 3.7 Sonnet is developed by Anthropic and K2 Horizon 7B is developed by Institute of Foundation Models.

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