I

K2 Horizon 3.7B

Sep 2026
IK2 Horizon 3.7B
Compare in
on
—per task?
$0.30 / $1.20per 1M in / out?
—output speed?
524Kcontext

Rankingin thinking mode?

Full ranking →
1Sonnet 5.51,817.32Opus 5.51,8033Muse Wonder Full1,729.34Fable 5.11,672.35Opus 51,659.5
···
76Ling 3.0 Flash797.677K2 Horizon 3.7B793.178Grok 4.3761.9

Strong at

B
Reasoning#149 of 334Knowledge#146 of 318
C
Coding#75 of 132Agents & work tasks#93 of 175Science#188 of 312Long context#150 of 273

Alternatives?

ModelScoreCostPer taskWhat changes
CheaperQwen3.8 FlashthinkingOpenwins 99%-56%$0.37Context: 524K → 262K+7BetterGPT-6 Lunanon-thinkingwins 65%-62%$0.011Function calling only with none · Chat Completions+3IOpenK2 Horizon 7Bthinkingwins 78%same$0.30 / $1.20Memory (4-bit): 2.5 GB → 4.5 GBCheaperClaude Haiku 5.5maxwins 99%-62%$0.21Remove sampling parameters+5CheaperMiMo v2.6 FlashthinkingOpenwins 98%-67%$0.062Memory (4-bit): 2.5 GB → 186 GB+4

Run it yourself

estimate
Fits on✓ 8 GB (phone, laptop) · 8-bit✓ 16 GB · full quality✓ 24 GB GPU · full quality✓ 48 GB GPU · full quality✓ 80 GB GPU · full quality
LicenceApache-2.0free for commercial use

Benchmarks

in Agents & Tool Use
Terminal-Bench 2.128.1#100
Terminal-Bench 4.00#75
GDPval-AA (work tasks) 2.119.1#93
AA-LCR (long context) 1.162.3#151
τ³-Banking · AA19.6#58
AutomationBench-AA14.7#69
AA-Briefcase 1.1 · Elo793.1#77

FAQ

How much does K2 Horizon 3.7B cost?›

$0.30 per 1M input tokens and $1.20 per 1M output tokens (cheapest host: Featherless).

Is K2 Horizon 3.7B free to use?›

There is no free API; the cheapest paid price is $0.30 per 1M input tokens. The weights are open, so you can run it yourself.

How good is K2 Horizon 3.7B, and what is it best at?›

#149 of 334 in Chat & Knowledge, #75 of 132 in Coding, #69 of 133 in Agents & Tool Use, #99 of 133 in Vision & Documents.

Is K2 Horizon 3.7B better than Ling 3.0 Flash?›

On AA-Briefcase 1.1 · Elo, K2 Horizon 3.7B scores 793.1 vs 797.6 — about the same.

How can I use K2 Horizon 3.7B?›

Through the API of Featherless.

What is the context window of K2 Horizon 3.7B?›

524K tokens.

When was K2 Horizon 3.7B released? Is there a newer version?›

Released 2026-09-03. It is the current version in its line.

Is K2 Horizon 3.7B open source?›

Yes, the weights are open (Apache-2.0 licence).

Can I run K2 Horizon 3.7B locally?›

The weights are open and can be self-hosted; hardware needs are not confirmed yet.

Can K2 Horizon 3.7B read images?›

No, it accepts text only.

What is K2 Horizon 3.7B?›

K2 Horizon 3.7B is an open-weights language model from Institute of Foundation Models, released Sep 2026.

What are the best alternatives to K2 Horizon 3.7B?›

Qwen3.8 Flash (cheaper), GPT-6 Luna (better), K2 Horizon 7B (open weights).