The two are evenly matched.Apodex 1.1 is better at reasoning; K2 Horizon 375B A23B at agents.
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
- ReasoningHard problems that need careful thinking10Apodex 1.11 of 3 tests · 2 ties
- CodingWriting and fixing software11Even1 each
- FactsGetting facts right instead of making them up11Even1 each
- Long documentsFinding answers in very long texts00Even0 each · 1 tie
Long documents rests on a single test.
What it costs
Prices per million tokens, roughly 750,000 words. The bars show the cost of a million tokens read plus a million written.
The biggest differences
The three tests each model wins by the widest margin. Scores are out of 100.
Where K2 Horizon 375B A23B pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+52.5points ahead
- Customer-service tasks in a simulated bankτ-Bench V3 · Banking+9points ahead
- Real work tasks from 44 professionsGDPVal+8.4points ahead
Where Apodex 1.1 pulls ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+13.5points ahead
- Code for real scientific research problemsSciCode+2.6points ahead
- Very hard expert questions across many subjectsHumanity's Last Exam+2.1points 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.
CodingEven
- SciCodeApodex 1.1 by 2.645.542.9+2.6
- Terminal-Bench 2.1K2 Horizon 375B A23B by 2.269.771.9+2.2
AgentsK2 Horizon 375B A23B
- τ-Bench V3 · BankingK2 Horizon 375B A23B by 925.234.2+9
- GDPValK2 Horizon 375B A23B by 8.434.643+8.4
- Terminal-Bench 4.0K2 Horizon 375B A23B by 1.501.5+1.5
ReasoningApodex 1.1
- Humanity's Last ExamApodex 1.1 by 2.134.132+2.1
- GPQA Diamondtie86.487.3tie
- CritPttie4.64.6tie
FactsEven
- AA-Omniscience · Non-hallucinationK2 Horizon 375B A23B by 52.521.674.1+52.5
- AA-Omniscience · AccuracyApodex 1.1 by 13.531.718.2+13.5
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.
- AA-OmniscienceK2 Horizon 375B A23B by 18.9-21.9-3+18.9
- AA Agentic IndexK2 Horizon 375B A23B by 4.336.640.9+4.3
- AA IntelligenceK2 Horizon 375B A23B by 4.126.430.5+4.1
- Artificial Analysis Coding Indextie60.861.5tie
Questions people ask
Which is better, Apodex 1.1 or K2 Horizon 375B A23B?
Apodex 1.1 and K2 Horizon 375B A23B each win one of the five areas where both have results. Apodex 1.1 wins reasoning; K2 Horizon 375B A23B wins agents. They are level on coding, facts and long documents.
Which is better for coding?
Neither. They win 1 coding test each of the 2 both models report.
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.