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K2 Horizon 375b A23b

Institute of Foundation Models·Released Sep 3, 2026

Updated Oct 8, 9:18 PM ET

Overall score
42.1
Not ranked yet: results from only one evaluator so far
Evidence
5 results
15% of scored kinds covered
Context window
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The score is on the board's scale (reference average 50, about 15 points per standard deviation), not a percentage.

By domain

Each domain is scored on the same scale as the overall score. Coverage is the share of the domain's kinds of evaluation with a result; it says how much evidence there is, not how good the model is.

Coding
34.5
2 results · 22% coverage
Research and reasoning
44.5
1 result · 13% coverage
Professional work
51.1
1 result · 11% coverage
Knowledge and accuracy
47.0
1 result · 17% coverage
Human preference
42.9
Not tested yet: shows the overall level

Every result behind the score

The result as the evaluator publishes it, and the reading it gives on the board's scale. A hard evaluation can give a high reading for a modest result; results near 95% or 5% only say "at least" or "at most".

Coding

2 results · 34.5

Research and reasoning

1 result · 44.5

Professional work

1 result · 51.1

Knowledge and accuracy

1 result · 47.0
  • AA-LCR
    Artificial Analysis
    80.0%
    Reading 49.1

Shown, not scored

Composite indices, saturated or older evaluations, evaluations still being checked, and vision, writing and multilingual results. They do not move the score.

No result yet

Scored evaluations this model has not taken. A missing result neither adds nor subtracts.

  • Terminal-Bench 4.0 · Vals AI
  • LiveBench Coding · LiveBench
  • Code Migration · Vals AI
  • ProgramBench · Vals AI
  • Vibe Code Bench · Vals AI
  • Vibe Code Bench 1–100 · Vals AI
  • CyberBench Patch · Vals AI
  • APEX-SWE · Mercor
  • FrontierMath Tiers 1–3 · Epoch AI
  • FrontierMath Tier 4 · Epoch AI
  • LiveBench Reasoning · LiveBench
  • Chess Puzzles · Epoch AI
  • Mystery Game Puzzles · Epoch AI
  • MysteryMechanism · Vals AI
  • Terminal-Bench Science · Vals AI
  • ProofBench · Vals AI
  • Finance Agent · Vals AI
  • APEX-Agents · Mercor
  • Harvey Legal Agent Benchmark · Vals AI
  • MedCode · Vals AI
  • Legal Research Bench · Vals AI
  • Tax Agent Bench · Vals AI
  • EMB · Vals AI
  • LiveBench Data Analysis · LiveBench
  • τ²-Bench Telecom (AA run) · Artificial Analysis
  • SimpleQA Verified · Epoch AI
  • LiveBench Language · LiveBench
  • LiveBench Instruction Following · LiveBench
  • BullshitBench · BullshitBench
  • IFBench (AA run) · Artificial Analysis
  • Arena Text · LMArena
How readings and scores are computed