Apertus 8B Instruct vs Claude Opus 4.6
Wins 0 of 5 areas
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Wins 5 of 5 areas
Coding · Reasoning · Facts · Long documents · Following instructions
Claude Opus 4.6 is the stronger all-rounder.Apertus 8B Instruct is cheaper.
Scores updated · 13 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 thinking03Claude Opus 4.63 of 3 tests
- CodingWriting and fixing software02Claude Opus 4.62 of 2 tests
- FactsGetting facts right instead of making them up02Claude Opus 4.62 of 2 tests
- Long documentsFinding answers in very long texts01Claude Opus 4.61 of 1 test
- Following instructionsDoing exactly what it is asked01Claude Opus 4.61 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.
Apertus 8B Instruct costs 99% less for the same work.
The biggest differences
The tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where Claude Opus 4.6 pulls ahead
- Graduate-level biology, physics and chemistry questionsGPQA Diamond+64points ahead
- Code for real scientific research problemsSciCode+47.8points ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+37.3points ahead
Where Apertus 8B Instruct pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 13 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Opus 4.6
- SciCodeClaude Opus 4.6 by 47.84.151.9+47.8
- Terminal-Bench HardClaude Opus 4.6 by 46.2046.2+46.2
ReasoningClaude Opus 4.6
- GPQA DiamondClaude Opus 4.6 by 6425.689.6+64
- Humanity's Last ExamClaude Opus 4.6 by 34.9539.9+34.9
- CritPtClaude Opus 4.6 by 12.6012.6+12.6
FactsClaude Opus 4.6
- AA-Omniscience · AccuracyClaude Opus 4.6 by 37.39.747+37.3
- AA-Omniscience · Non-hallucinationClaude Opus 4.6 by 33.33.937.2+33.3
Following instructionsClaude Opus 4.6
- IFBenchClaude Opus 4.6 by 30.722.453.1+30.7
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-OmniscienceClaude Opus 4.6 by 90.9-77.213.7+90.9
- τ²-Bench Telecom (AA run)Claude Opus 4.6 by 80.711.492.1+80.7
- AA Agentic IndexClaude Opus 4.6 by 63.83.867.6+63.8
- AA IntelligenceClaude Opus 4.6 by 27.14.831.9+27.1
Questions people ask
Which is better, Apertus 8B Instruct or Claude Opus 4.6?
Claude Opus 4.6 wins all five areas where both have results: coding, reasoning, facts, long documents and following instructions. Apertus 8B Instruct wins none, but costs 99% less.
Which is better for coding?
Claude Opus 4.6. It wins 2 of the 2 coding tests both models report; Apertus 8B Instruct wins none.
Which is cheaper?
Apertus 8B Instruct costs $0.10 per million input tokens and $0.20 per million output tokens; Claude Opus 4.6 costs $5.00 and $25.00. That makes Apertus 8B Instruct about 99% cheaper for the same work.
How do you compare the two?
We use the 13 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 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.