Apriel-v1.5-15B-Thinker vs Claude Haiku 4.5
Wins 2 of 6 areas
Reasoning · Following instructions
Wins 4 of 6 areas
Coding · Facts · Images and charts · Long documents
Claude Haiku 4.5 is the stronger all-rounder.Apriel-v1.5-15B-Thinker is better at reasoning.
Scores updated · 13 tests both models report · How we compare
Where each one wins
Tests won in each of the six 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.
- CodingWriting and fixing software02Claude Haiku 4.52 of 2 tests
- FactsGetting facts right instead of making them up02Claude Haiku 4.52 of 2 tests
- Images and chartsUnderstanding pictures, charts and video01Claude Haiku 4.51 of 1 test
- Long documentsFinding answers in very long texts01Claude Haiku 4.51 of 1 test
- ReasoningHard problems that need careful thinking30Apriel-v1.5-15B-Thinker3 of 3 tests
- Following instructionsDoing exactly what it is asked10Apriel-v1.5-15B-Thinker1 of 1 test
Images and charts, 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 three tests each model wins by the widest margin. Scores are out of 100.
Where Claude Haiku 4.5 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+58points ahead
- Reasons across sets of long documentsAA-LCR+53points ahead
- Hard command-line tasks in a real terminalTerminal-Bench Hard+16.7points ahead
Where Apriel-v1.5-15B-Thinker pulls ahead
- Follows unfamiliar, precisely checkable instructionsIFBench+7.4points ahead
- Graduate-level biology, physics and chemistry questionsGPQA Diamond+4.1points ahead
- Very hard expert questions across many subjectsHumanity's Last Exam+1.7points ahead
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 Haiku 4.5
- Terminal-Bench HardClaude Haiku 4.5 by 16.710.627.3+16.7
- SciCodeClaude Haiku 4.5 by 7.434.842.2+7.4
ReasoningApriel-v1.5-15B-Thinker
- GPQA DiamondApriel-v1.5-15B-Thinker by 4.171.367.2+4.1
- Humanity's Last ExamApriel-v1.5-15B-Thinker by 1.712.110.4+1.7
- CritPtApriel-v1.5-15B-Thinker by 1.11.10+1.1
FactsClaude Haiku 4.5
- AA-Omniscience · Non-hallucinationClaude Haiku 4.5 by 5814.772.7+58
- AA-Omniscience · AccuracyClaude Haiku 4.5 by 1.516.418+1.5
Images and chartsClaude Haiku 4.5
- MMMU-ProClaude Haiku 4.5 by 1.557.158.6+1.5
Following instructionsApriel-v1.5-15B-Thinker
- IFBenchApriel-v1.5-15B-Thinker by 7.461.754.3+7.4
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-OmniscienceClaude Haiku 4.5 by 50.4-54.8-4.4+50.4
- τ²-Bench Telecom (AA run)Apriel-v1.5-15B-Thinker by 13.768.454.7+13.7
- AA IntelligenceClaude Haiku 4.5 by 3.113.816.9+3.1
Questions people ask
Which is better, Apriel-v1.5-15B-Thinker or Claude Haiku 4.5?
Claude Haiku 4.5 wins four of the six areas where both have results: coding, facts, images and charts and long documents. Apriel-v1.5-15B-Thinker wins reasoning and following instructions.
Which is better for coding?
Claude Haiku 4.5. It wins 2 of the 2 coding tests both models report; Apriel-v1.5-15B-Thinker wins none.
How do you compare the two?
We use the 13 benchmark tests both models have published scores on. The verdict counts the 10 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.