Back to models

Institute of Foundation Models

K2 Horizon 375B A23B

  • Released
  • Open weights
  • Apache 2.0
Intelligence Index

Reasoning setting

30.5#32 of 83measured models
Measured · Artificial Analysis v4.3.2
Context window
524.29K tok

Performance profile

ReasoningRank #29 of 107
87.3%
GPQA Diamond
CodingRank #54 of 94
42.9%
SciCode

Capabilities

Context window

Modalities

Measured setting

Reasoning trade-offs

Source (opens in a new tab)
Intelligence Index v4.3.2
Reasoning
Intelligence Index
30.5
Evaluation time
7.3m
Pricing unverified

Pricing & access

No API offering listed in our tracked sources.

Run locally

Benchmarks

Full leaderboardSource (opens in a new tab)

Humanity’s Last Exam

Frontier reasoning

K2 Horizon 375B A23B · Reasoning#47 of 126

  1. 1Claude Opus 5.5Max61.4%
  2. 2Claude Fable 5.1Max59.1%
  3. 3Gemini 4 ArgonHigh57.1%
  4. 44Agnes 2.5 Pro AlphaReasoning33.6%
  5. 45Hy3Reasoning33.5%
  6. 46Inkling SmallReasoning33.3%
  7. 47K2 Horizon 375B A23BReasoning32.0%
  8. 48InklingExtra high31.9%
  9. 49Nemotron 3.5 Super VLReasoning30.7%
  10. 50A.X-K2Reasoning29.6%

Peers use their best measured result on this benchmark.

Alternatives

Each model at its highest-scoring measured setting · Intelligence Index v4.3.2 and its evaluation cost per task.