Claude Haiku 4.5 vs Solar Pro 2
Wins 4 of 6 areas
Coding · Agents · Long documents · Following instructions
Wins 0 of 6 areas
—
Claude Haiku 4.5 is the stronger all-rounder.
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.
- CodingWriting and fixing software20Claude Haiku 4.52 of 2 tests
- AgentsCarrying out multi-step tasks on its own10Claude Haiku 4.51 of 1 test
- 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
- ReasoningHard problems that need careful thinking11Even1 each · 1 tie
- FactsGetting facts right instead of making them up11Even1 each
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+67.4points ahead
- Hard command-line tasks in a real terminalTerminal-Bench Hard+24.3points ahead
- Follows unfamiliar, precisely checkable instructionsIFBench+17.2points ahead
Where Solar Pro 2 pulls ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+2points ahead
- Graduate-level biology, physics and chemistry questionsGPQA Diamond+1.5points 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 24.327.33+24.3
- SciCodeClaude Haiku 4.5 by 1242.230.2+12
ReasoningEven
- Humanity's Last ExamClaude Haiku 4.5 by 310.47.4+3
- GPQA DiamondSolar Pro 2 by 1.567.268.7+1.5
- CritPttie00tie
FactsEven
- AA-Omniscience · Non-hallucinationClaude Haiku 4.5 by 67.472.75.3+67.4
- AA-Omniscience · AccuracySolar Pro 2 by 21819.9+2
Following instructionsClaude Haiku 4.5
- IFBenchClaude Haiku 4.5 by 17.254.337.1+17.2
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 51.5-4.4-55.9+51.5
- Artificial Analysis Coding IndexClaude Haiku 4.5 by 31.843.912.1+31.8
- τ²-Bench Telecom (AA run)Claude Haiku 4.5 by 26.654.728.1+26.6
- AA IntelligenceClaude Haiku 4.5 by 9.416.97.5+9.4
- AA Agentic IndexSolar Pro 2 by 1.110.311.4+1.1
Questions people ask
Which is better, Claude Haiku 4.5 or Solar Pro 2?
Claude Haiku 4.5 wins four of the six areas where both have results: coding, agents, long documents and following instructions. Solar Pro 2 wins none. They are level on reasoning and facts.
Which is better for coding?
Claude Haiku 4.5. It wins 2 of the 2 coding tests both models report; Solar Pro 2 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.