Claude Opus 4.8 vs Solar Pro4
Wins 5 of 6 areas
Coding · Agents · Reasoning · Math · Long documents
Wins 0 of 6 areas
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Claude Opus 4.8 is the stronger all-rounder.Solar Pro4 is cheaper.
Scores updated · 19 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 software40Claude Opus 4.84 of 4 tests
- AgentsCarrying out multi-step tasks on its own40Claude Opus 4.84 of 4 tests
- ReasoningHard problems that need careful thinking30Claude Opus 4.83 of 3 tests
- MathCompetition and research-level math10Claude Opus 4.81 of 1 test
- Long documentsFinding answers in very long texts10Claude Opus 4.81 of 1 test
- FactsGetting facts right instead of making them up11Even1 each
Math and long documents 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 Pro4 costs 95% 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 Opus 4.8 pulls ahead
- Finds hard-to-locate facts by browsing the webBrowseComp+35.1points ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+29.9points ahead
- Command-line tasks in a real terminalTerminal-Bench 2.1+27.3points ahead
Where Solar Pro4 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+14.9points ahead
Every test, side by side
All 19 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Opus 4.8
- Terminal-Bench 2.1Claude Opus 4.8 by 27.384.657.3+27.3
- LMArena · WebDevClaude Opus 4.8 by 185 rating points15561371+185 rating
- SWE-bench VerifiedClaude Opus 4.8 by 1888.670.6+18
- SciCodeClaude Opus 4.8 by 9.854.444.6+9.8
AgentsClaude Opus 4.8
- BrowseCompClaude Opus 4.8 by 35.184.349.2+35.1
- Terminal-Bench 4.0Claude Opus 4.8 by 21.221.70.5+21.2
- GDPValClaude Opus 4.8 by 17.347.830.5+17.3
- τ-Bench V3 · BankingClaude Opus 4.8 by 10.934.223.3+10.9
ReasoningClaude Opus 4.8
- Humanity's Last ExamClaude Opus 4.8 by 19.548.729.2+19.5
- CritPtClaude Opus 4.8 by 15.520.95.4+15.5
- GPQA DiamondClaude Opus 4.8 by 2.99289.1+2.9
FactsEven
- AA-Omniscience · AccuracyClaude Opus 4.8 by 29.948.818.9+29.9
- AA-Omniscience · Non-hallucinationSolar Pro4 by 14.960.775.6+14.9
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 Opus 4.8 by 29.628.8-0.8+29.6
- Artificial Analysis Coding IndexClaude Opus 4.8 by 21.674.352.7+21.6
- AA IntelligenceClaude Opus 4.8 by 13.641.828.2+13.6
- AA Agentic IndexClaude Opus 4.8 by 942.633.6+9
Questions people ask
Which is better, Claude Opus 4.8 or Solar Pro4?
Claude Opus 4.8 wins five of the six areas where both have results: coding, agents, reasoning, math and long documents. Solar Pro4 wins none, but costs 95% less. They are level on facts.
Which is better for coding?
Claude Opus 4.8. It wins 4 of the 4 coding tests both models report; Solar Pro4 wins none.
Which is cheaper?
Claude Opus 4.8 costs $5.00 per million input tokens and $25.00 per million output tokens; Solar Pro4 costs $0.30 and $1.20. That makes Solar Pro4 about 95% cheaper for the same work.
How do you compare the two?
We use the 19 benchmark tests both models have published scores on. The verdict counts the 15 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.