A.X-K2 vs K2-Horizon-0.9B
Wins 5 of 5 areas
Coding · Agents · Reasoning · Facts · Long documents
Wins 0 of 5 areas
—
A.X-K2 is the stronger all-rounder.
Scores updated · 12 tests both models report · How we compare
Where each one wins
Tests won in each of the five areas where both have results. Each piece is one test, so a longer bar means more evidence; grey means the two scored within a point of each other.
- ReasoningHard problems that need careful thinking30A.X-K23 of 3 tests
- AgentsCarrying out multi-step tasks on its own20A.X-K22 of 3 tests · 1 tie
- FactsGetting facts right instead of making them up20A.X-K22 of 2 tests
- CodingWriting and fixing software10A.X-K21 of 1 test
- Long documentsFinding answers in very long texts10A.X-K21 of 1 test
Coding and long documents rest on a single test each.
The biggest differences
The tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where A.X-K2 pulls ahead
- Reasons across sets of long documentsAA-LCR+63.7points ahead
- Graduate-level biology, physics and chemistry questionsGPQA Diamond+56.4points ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+52.7points ahead
Where K2-Horizon-0.9B pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 12 tests both models report. The winning score is in its model's colour; marks a score checked independently.
AgentsA.X-K2
- GDPValA.X-K2 by 23.223.20+23.2
- τ-Bench V3 · BankingA.X-K2 by 11.216.14.9+11.2
- Terminal-Bench 4.0tie00tie
ReasoningA.X-K2
- GPQA DiamondA.X-K2 by 56.485.729.3+56.4
- Humanity's Last ExamA.X-K2 by 24.229.65.4+24.2
- CritPtA.X-K2 by 8.98.90+8.9
FactsA.X-K2
- AA-Omniscience · Non-hallucinationA.X-K2 by 52.76714.3+52.7
- AA-Omniscience · AccuracyA.X-K2 by 11.718.66.9+11.7
Other results2 tests, not counted
Tests outside the eight areas. They are not counted above: several are summary scores built from other tests, or the same test under another name.
- AA-OmniscienceA.X-K2 by 64.6-8.2-72.8+64.6
- AA IntelligenceA.X-K2 by 18.521.53+18.5
Questions people ask
Which is better, A.X-K2 or K2-Horizon-0.9B?
A.X-K2 wins all five areas where both have results: coding, agents, reasoning, facts and long documents. K2-Horizon-0.9B wins none.
Which is better for coding?
A.X-K2. It wins the one coding test both models report.
How do you compare the two?
We use the 12 benchmark tests both models have published scores on. The verdict counts the 10 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 2 are listed but not counted, because several are summary scores or repeat a test. Each score is the one shown on the model's own page.