A.X-K2 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 own20A.X-K22 of 3 tests · 1 tie
- ReasoningHard problems that need careful thinking21A.X-K22 of 3 tests
- Long documentsFinding answers in very long texts10A.X-K21 of 1 test
- CodingWriting and fixing software11Even1 each
- FactsGetting facts right instead of making them up11Even1 each
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 A.X-K2 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+42.4points ahead
- Graduate-level biology, physics and chemistry questionsGPQA Diamond+7.7points ahead
- Research-level physics problemsCritPt+6.3points ahead
Where LongCat-2.0 pulls ahead
- Command-line tasks in a real terminalTerminal-Bench 2.1+11.2points ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+11points ahead
- Very hard expert questions across many subjectsHumanity's Last Exam+4.1points 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
- Terminal-Bench 2.1LongCat-2.0 by 11.23950.2+11.2
- SciCodeA.X-K2 by 4.74136.3+4.7
AgentsA.X-K2
- GDPValA.X-K2 by 4.623.218.6+4.6
- τ-Bench V3 · BankingA.X-K2 by 2.916.113.2+2.9
- Terminal-Bench 4.0tie00tie
ReasoningA.X-K2
- GPQA DiamondA.X-K2 by 7.785.778+7.7
- CritPtA.X-K2 by 6.38.92.6+6.3
- Humanity's Last ExamLongCat-2.0 by 4.129.633.7+4.1
FactsEven
- AA-Omniscience · Non-hallucinationA.X-K2 by 42.46724.6+42.4
- AA-Omniscience · AccuracyLongCat-2.0 by 1118.629.6+11
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-OmniscienceA.X-K2 by 15.2-8.2-23.4+15.2
- AA Agentic IndexA.X-K2 by 9.825.715.9+9.8
- Artificial Analysis Coding IndexLongCat-2.0 by 6.538.845.3+6.5
- AA IntelligenceA.X-K2 by 2.421.519.1+2.4
Questions people ask
Which is better, A.X-K2 or LongCat-2.0?
A.X-K2 wins three of the five areas where both have results: agents, reasoning and long documents. LongCat-2.0 wins none. They are level on coding and facts.
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.