Claude Haiku 4.5 vs Solar Pro 3
Wins 4 of 6 areas
Coding · Agents · Facts · Long documents
Wins 2 of 6 areas
Reasoning · Following instructions
Claude Haiku 4.5 is the stronger all-rounder.Solar Pro 3 is cheaper and better at reasoning.
Scores updated · 17 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 software30Claude Haiku 4.53 of 3 tests
- AgentsCarrying out multi-step tasks on its own10Claude Haiku 4.51 of 3 tests · 2 ties
- FactsGetting facts right instead of making them up10Claude Haiku 4.51 of 2 tests · 1 tie
- Long documentsFinding answers in very long texts10Claude Haiku 4.51 of 1 test
- ReasoningHard problems that need careful thinking01Solar Pro 31 of 3 tests · 2 ties
- Following instructionsDoing exactly what it is asked01Solar Pro 31 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.
Solar Pro 3 costs 88% 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 Haiku 4.5 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+60.9points ahead
- Reasons across sets of long documentsAA-LCR+42points ahead
- Command-line tasks in a real terminalTerminal-Bench 2.1+32.2points ahead
Where Solar Pro 3 pulls ahead
- Follows unfamiliar, precisely checkable instructionsIFBench+16.9points ahead
- Graduate-level biology, physics and chemistry questionsGPQA Diamond+5.2points ahead
Every test, side by side
All 17 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Haiku 4.5
- Terminal-Bench 2.1Claude Haiku 4.5 by 32.244.212+32.2
- Terminal-Bench HardClaude Haiku 4.5 by 19.727.37.6+19.7
- SciCodeClaude Haiku 4.5 by 16.742.225.5+16.7
AgentsClaude Haiku 4.5
- GDPValClaude Haiku 4.5 by 11.811.80+11.8
- τ-Bench V3 · Bankingtie9.38.7tie
- Terminal-Bench 4.0tie00tie
ReasoningSolar Pro 3
- GPQA DiamondSolar Pro 3 by 5.267.272.4+5.2
- Humanity's Last Examtie10.410.3tie
- CritPttie00tie
FactsClaude Haiku 4.5
- AA-Omniscience · Non-hallucinationClaude Haiku 4.5 by 60.972.711.8+60.9
- AA-Omniscience · Accuracytie1818.5tie
Following instructionsSolar Pro 3
- IFBenchSolar Pro 3 by 16.954.371.2+16.9
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 Haiku 4.5 by 49-4.4-53.4+49
- τ²-Bench Telecom (AA run)Solar Pro 3 by 31.654.786.3+31.6
- Artificial Analysis Coding IndexClaude Haiku 4.5 by 27.743.916.2+27.7
- AA IntelligenceClaude Haiku 4.5 by 9.116.97.8+9.1
Questions people ask
Which is better, Claude Haiku 4.5 or Solar Pro 3?
Claude Haiku 4.5 wins four of the six areas where both have results: coding, agents, facts and long documents. Solar Pro 3 wins reasoning and following instructions, and costs 88% less.
Which is better for coding?
Claude Haiku 4.5. It wins 3 of the 3 coding tests both models report; Solar Pro 3 wins none.
Which is cheaper?
Claude Haiku 4.5 costs $1.00 per million input tokens and $5.00 per million output tokens; Solar Pro 3 costs $0.15 and $0.60. That makes Solar Pro 3 about 88% cheaper for the same work.
How do you compare the two?
We use the 17 benchmark tests both models have published scores on. The verdict counts the 13 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.