Apertus 8B Instruct vs K2-V2 (high)
Wins 0 of 5 areas
—
Wins 5 of 5 areas
Coding · Reasoning · Facts · Long documents · Following instructions
K2-V2 (high) 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 thinking02K2-V2 (high)2 of 3 tests · 1 tie
- CodingWriting and fixing software02K2-V2 (high)2 of 2 tests
- FactsGetting facts right instead of making them up02K2-V2 (high)2 of 2 tests
- Long documentsFinding answers in very long texts01K2-V2 (high)1 of 1 test
- Following instructionsDoing exactly what it is asked01K2-V2 (high)1 of 1 test
Long documents and following instructions rest on a single test each.
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 tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where K2-V2 (high) pulls ahead
- Graduate-level biology, physics and chemistry questionsGPQA Diamond+42.5points ahead
- Follows unfamiliar, precisely checkable instructionsIFBench+37.7points ahead
- Code for real scientific research problemsSciCode+24.5points ahead
Where Apertus 8B Instruct 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.
CodingK2-V2 (high)
- SciCodeK2-V2 (high) by 24.54.128.6+24.5
- Terminal-Bench HardK2-V2 (high) by 9.809.8+9.8
ReasoningK2-V2 (high)
- GPQA DiamondK2-V2 (high) by 42.525.668.1+42.5
- Humanity's Last ExamK2-V2 (high) by 5.5510.5+5.5
- CritPttie00tie
FactsK2-V2 (high)
- AA-Omniscience · AccuracyK2-V2 (high) by 8.89.718.5+8.8
- AA-Omniscience · Non-hallucinationK2-V2 (high) by 5.13.99+5.1
Following instructionsK2-V2 (high)
- IFBenchK2-V2 (high) by 37.722.460.1+37.7
Other results3 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-V2 (high) by 21.6-77.2-55.6+21.6
- τ²-Bench Telecom (AA run)K2-V2 (high) by 16.411.427.8+16.4
- AA IntelligenceK2-V2 (high) by 5.14.89.9+5.1
Questions people ask
Which is better, Apertus 8B Instruct or K2-V2 (high)?
K2-V2 (high) wins all five areas where both have results: coding, reasoning, facts, long documents and following instructions. Apertus 8B Instruct wins none.
Which is better for coding?
K2-V2 (high). It wins 2 of the 2 coding tests both models report; Apertus 8B Instruct wins none.
How do you compare the two?
We use the 12 benchmark tests both models have published scores on. The verdict counts the 9 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 3 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.