Claude Haiku 4.5 vs Solar Open 100B (Reasoning)
Wins 5 of 6 areas
Coding · Agents · Reasoning · Facts · Long documents
Wins 1 of 6 areas
Following instructions
Claude Haiku 4.5 is the stronger all-rounder.Solar Open 100B (Reasoning) is better at following instructions.
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
- ReasoningHard problems that need careful thinking10Claude Haiku 4.51 of 3 tests · 2 ties
- FactsGetting facts right instead of making them up10Claude Haiku 4.51 of 2 tests · 1 tie
- 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 asked01Solar Open 100B (Reasoning)1 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+62.3points ahead
- Reasons across sets of long documentsAA-LCR+33.3points ahead
- Hard command-line tasks in a real terminalTerminal-Bench Hard+25points ahead
Where Solar Open 100B (Reasoning) pulls ahead
- Follows unfamiliar, precisely checkable instructionsIFBench+3.4points 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 2527.32.3+25
- SciCodeClaude Haiku 4.5 by 15.342.226.9+15.3
ReasoningClaude Haiku 4.5
- GPQA DiamondClaude Haiku 4.5 by 1.567.265.7+1.5
- CritPttie00tie
- Humanity's Last Examtie10.410.4tie
FactsClaude Haiku 4.5
- AA-Omniscience · Non-hallucinationClaude Haiku 4.5 by 62.372.710.4+62.3
- AA-Omniscience · Accuracytie1818.5tie
Following instructionsSolar Open 100B (Reasoning)
- IFBenchSolar Open 100B (Reasoning) by 3.454.357.7+3.4
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 50.1-4.4-54.5+50.1
- Artificial Analysis Coding IndexClaude Haiku 4.5 by 33.443.910.5+33.4
- AA Agentic IndexSolar Open 100B (Reasoning) by 1410.324.3+14
- AA IntelligenceClaude Haiku 4.5 by 6.516.910.4+6.5
- τ²-Bench Telecom (AA run)Claude Haiku 4.5 by 6.554.748.2+6.5
Questions people ask
Which is better, Claude Haiku 4.5 or Solar Open 100B (Reasoning)?
Claude Haiku 4.5 wins five of the six areas where both have results: coding, agents, reasoning, facts and long documents. Solar Open 100B (Reasoning) wins following instructions.
Which is better for coding?
Claude Haiku 4.5. It wins 2 of the 2 coding tests both models report; Solar Open 100B (Reasoning) 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.