Muse Spark Open vs Claude Opus 5
Wins 0 of 7 areas
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Wins 6 of 7 areas
Agents · Reasoning · Facts · Images and charts · Math · Long documents
Claude Opus 5 is the stronger all-rounder.Muse Spark Open is cheaper.
Scores updated · 16 tests both models report · How we compare
Where each one wins
Tests won in each of the seven 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 thinking03Claude Opus 53 of 3 tests
- AgentsCarrying out multi-step tasks on its own02Claude Opus 52 of 2 tests
- MathCompetition and research-level math02Claude Opus 52 of 2 tests
- FactsGetting facts right instead of making them up12Claude Opus 52 of 3 tests
- Images and chartsUnderstanding pictures, charts and video01Claude Opus 51 of 1 test
- Long documentsFinding answers in very long texts01Claude Opus 51 of 1 test
- CodingWriting and fixing software11Even1 each
Images and charts 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.
Muse Spark Open costs 82% 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 5 pulls ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+41.5points ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+40.9points ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+21.6points ahead
Where Muse Spark Open pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+36.7points ahead
- Code for real scientific research problemsSciCode+2points ahead
Every test, side by side
All 16 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingEven
- Terminal-Bench 2.1Claude Opus 5 by 12.776.489.1+12.7
- SciCodeMuse Spark Open by 258.456.4+2
AgentsClaude Opus 5
- Terminal-Bench 4.0Claude Opus 5 by 40.98.149+40.9
- GDPValClaude Opus 5 by 1645.161.1+16
ReasoningClaude Opus 5
- CritPtClaude Opus 5 by 14.214.929.1+14.2
- Humanity's Last ExamClaude Opus 5 by 1143.954.9+11
- GPQA DiamondClaude Opus 5 by 4.28993.2+4.2
FactsClaude Opus 5
- AA-Omniscience · Non-hallucinationMuse Spark Open by 36.775.939.2+36.7
- AA-Omniscience · AccuracyClaude Opus 5 by 21.639.360.9+21.6
- SimpleQA VerifiedClaude Opus 5 by 3.356.659.9+3.3
Images and chartsClaude Opus 5
- MMMU-ProClaude Opus 5 by 3.880.984.7+3.8
MathClaude Opus 5
- FrontierMath Tier 4Claude Opus 5 by 41.531.773.2+41.5
- FrontierMath Tiers 1-3 (v2)Claude Opus 5 by 15.869.885.6+15.8
Other results2 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 5 by 12.424.637.1+12.4
- AA IntelligenceClaude Opus 5 by 11.938.950.8+11.9
Questions people ask
Which is better, Muse Spark Open or Claude Opus 5?
Claude Opus 5 wins six of the seven areas where both have results: agents, reasoning, facts, images and charts, math and long documents. Muse Spark Open wins none, but costs 82% less. They are level on coding.
Which is better for coding?
Neither. They win 1 coding test each of the 2 both models report.
Which is cheaper?
Muse Spark Open costs $1.25 per million input tokens and $4.25 per million output tokens; Claude Opus 5 costs $5.00 and $25.00. That makes Muse Spark Open about 82% cheaper for the same work.
How do you compare the two?
We use the 16 benchmark tests both models have published scores on. The verdict counts the 14 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 2 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.