Claude Haiku 4.5 vs Devstral Small
Wins 5 of 6 areas
Coding · Reasoning · Facts · Long documents · Following instructions
Wins 1 of 6 areas
Agents
Claude Haiku 4.5 is the stronger all-rounder.Devstral Small is better at agents.
Scores updated · 15 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.
- ReasoningHard problems that need careful thinking20Claude Haiku 4.52 of 3 tests · 1 tie
- CodingWriting and fixing software20Claude Haiku 4.52 of 2 tests
- FactsGetting facts right instead of making them up20Claude Haiku 4.52 of 2 tests
- Long documentsFinding answers in very long texts10Claude Haiku 4.51 of 1 test
- Following instructionsDoing exactly what it is asked10Claude Haiku 4.51 of 1 test
- AgentsCarrying out multi-step tasks on its own01Devstral Small1 of 1 test
Agents, 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 Claude Haiku 4.5 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+59.1points ahead
- Reasons across sets of long documentsAA-LCR+42.3points ahead
- Graduate-level biology, physics and chemistry questionsGPQA Diamond+23.8points ahead
Where Devstral Small pulls ahead
- Real work tasks from 44 professionsGDPVal+4.6points 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.
CodingClaude Haiku 4.5
- Terminal-Bench HardClaude Haiku 4.5 by 21.227.36.1+21.2
- SciCodeClaude Haiku 4.5 by 17.742.224.5+17.7
ReasoningClaude Haiku 4.5
- GPQA DiamondClaude Haiku 4.5 by 23.867.243.4+23.8
- Humanity's Last ExamClaude Haiku 4.5 by 6.410.44+6.4
- CritPttie00tie
FactsClaude Haiku 4.5
- AA-Omniscience · Non-hallucinationClaude Haiku 4.5 by 59.172.713.6+59.1
- AA-Omniscience · AccuracyClaude Haiku 4.5 by 2.11815.9+2.1
Following instructionsClaude Haiku 4.5
- IFBenchClaude Haiku 4.5 by 22.754.331.6+22.7
Other results5 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 52.4-4.4-56.8+52.4
- Artificial Analysis Coding IndexClaude Haiku 4.5 by 31.743.912.2+31.7
- τ²-Bench Telecom (AA run)Claude Haiku 4.5 by 16.754.738+16.7
- AA Agentic IndexDevstral Small by 14.810.325.1+14.8
- AA IntelligenceClaude Haiku 4.5 by 8.216.98.7+8.2
Questions people ask
Which is better, Claude Haiku 4.5 or Devstral Small?
Claude Haiku 4.5 wins five of the six areas where both have results: coding, reasoning, facts, long documents and following instructions. Devstral Small wins agents.
Which is better for coding?
Claude Haiku 4.5. It wins 2 of the 2 coding tests both models report; Devstral Small wins none.
How do you compare the two?
We use the 15 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 5 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.