A.X-K2 vs K2 Horizon 375B A23B
Wins 0 of 5 areas
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Wins 5 of 5 areas
Coding · Agents · Reasoning · Facts · Long documents
K2 Horizon 375B A23B is the stronger all-rounder.
Scores updated · 15 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.
- AgentsCarrying out multi-step tasks on its own03K2 Horizon 375B A23B3 of 3 tests
- CodingWriting and fixing software02K2 Horizon 375B A23B2 of 2 tests
- ReasoningHard problems that need careful thinking12K2 Horizon 375B A23B2 of 3 tests
- FactsGetting facts right instead of making them up01K2 Horizon 375B A23B1 of 2 tests · 1 tie
- Long documentsFinding answers in very long texts01K2 Horizon 375B A23B1 of 1 test
Long documents rests on a single test.
The biggest differences
The tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where K2 Horizon 375B A23B pulls ahead
- Command-line tasks in a real terminalTerminal-Bench 2.1+32.9points ahead
- Real work tasks from 44 professionsGDPVal+19.8points ahead
- Customer-service tasks in a simulated bankτ-Bench V3 · Banking+18.1points ahead
Where A.X-K2 pulls ahead
- Research-level physics problemsCritPt+4.3points ahead
Every test, side by side
All 15 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingK2 Horizon 375B A23B
- Terminal-Bench 2.1K2 Horizon 375B A23B by 32.93971.9+32.9
- SciCodeK2 Horizon 375B A23B by 1.94142.9+1.9
AgentsK2 Horizon 375B A23B
- GDPValK2 Horizon 375B A23B by 19.823.243+19.8
- τ-Bench V3 · BankingK2 Horizon 375B A23B by 18.116.134.2+18.1
- Terminal-Bench 4.0K2 Horizon 375B A23B by 1.501.5+1.5
ReasoningK2 Horizon 375B A23B
- CritPtA.X-K2 by 4.38.94.6+4.3
- Humanity's Last ExamK2 Horizon 375B A23B by 2.429.632+2.4
- GPQA DiamondK2 Horizon 375B A23B by 1.685.787.3+1.6
FactsK2 Horizon 375B A23B
- AA-Omniscience · Non-hallucinationK2 Horizon 375B A23B by 7.16774.1+7.1
- AA-Omniscience · Accuracytie18.618.2tie
Long documentsK2 Horizon 375B A23B
- AA-LCRK2 Horizon 375B A23B by 107080+10
Other results4 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.
- Artificial Analysis Coding IndexK2 Horizon 375B A23B by 22.738.861.5+22.7
- AA Agentic IndexK2 Horizon 375B A23B by 15.225.740.9+15.2
- AA IntelligenceK2 Horizon 375B A23B by 921.530.5+9
- AA-OmniscienceK2 Horizon 375B A23B by 5.2-8.2-3+5.2
Questions people ask
Which is better, A.X-K2 or K2 Horizon 375B A23B?
K2 Horizon 375B A23B wins all five areas where both have results: coding, agents, reasoning, facts and long documents. A.X-K2 wins none.
Which is better for coding?
K2 Horizon 375B A23B. It wins 2 of the 2 coding tests both models report; A.X-K2 wins none.
How do you compare the two?
We use the 15 benchmark tests both models have published scores on. The verdict counts the 11 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 4 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.