Claude Opus 4.5 vs Muse Spark 1.1
Wins 1 of 8 areas
Math
Wins 6 of 8 areas
Coding · Agents · Reasoning · Facts · Images and charts · Following instructions
Muse Spark 1.1 is the stronger all-rounder.Claude Opus 4.5 is better at math.
Scores updated · 29 tests both models report · How we compare
Where each one wins
Tests won in each of the eight areas we test. 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 thinking04Muse Spark 1.14 of 4 tests
- CodingWriting and fixing software14Muse Spark 1.14 of 5 tests
- FactsGetting facts right instead of making them up03Muse Spark 1.13 of 3 tests
- Following instructionsDoing exactly what it is asked02Muse Spark 1.12 of 2 tests
- AgentsCarrying out multi-step tasks on its own12Muse Spark 1.12 of 3 tests
- Images and chartsUnderstanding pictures, charts and video01Muse Spark 1.11 of 1 test
- MathCompetition and research-level math10Claude Opus 4.51 of 1 test
- Long documentsFinding answers in very long texts00Even0 each · 1 tie
Images and charts, 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.
Muse Spark 1.1 costs 82% less for the same work.
The biggest differences
The three tests each model wins by the widest margin. Scores are out of 100.
Where Muse Spark 1.1 pulls ahead
- Multi-step tasks using many real software toolsMCP Atlas+25.8points ahead
- Reasoning about charts from research papersCharXiv (RQ)+21.2points ahead
- Fixes real GitHub issues, working as an agentLiveBench · Agentic Coding+18.8points ahead
Where Claude Opus 4.5 pulls ahead
- Real work tasks from 44 professionsGDPVal+11.6points ahead
- Fresh competition math problemsLiveBench · Mathematics+3.3points ahead
- Programming problems, refreshed regularlyLiveBench · Coding+2.5points ahead
Every test, side by side
All 29 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingMuse Spark 1.1
- LiveBench · Agentic CodingMuse Spark 1.1 by 18.839.758.5+18.8
- SWE-bench ProMuse Spark 1.1 by 9.55261.5+9.5
- SciCodeMuse Spark 1.1 by 9.349.558.8+9.3
- LMArena · WebDevMuse Spark 1.1 by 73 rating points14691542+73 rating
- LiveBench · CodingClaude Opus 4.5 by 2.579.777.2+2.5
AgentsMuse Spark 1.1
- MCP AtlasMuse Spark 1.1 by 25.862.388.1+25.8
- OSWorld-VerifiedMuse Spark 1.1 by 14.566.380.8+14.5
- GDPValClaude Opus 4.5 by 11.647.335.7+11.6
ReasoningMuse Spark 1.1
- Humanity's Last ExamMuse Spark 1.1 by 16.130.146.2+16.1
- CritPtMuse Spark 1.1 by 10.54.615.1+10.5
- LiveBench · ReasoningMuse Spark 1.1 by 7.680.187.7+7.6
- GPQA DiamondMuse Spark 1.1 by 3.286.689.8+3.2
FactsMuse Spark 1.1
- SimpleQA VerifiedMuse Spark 1.1 by 12.145.757.8+12.1
- AA-Omniscience · Non-hallucinationMuse Spark 1.1 by 113950+11
- AA-Omniscience · AccuracyMuse Spark 1.1 by 5.546.652+5.5
Images and chartsMuse Spark 1.1
- CharXiv (RQ)Muse Spark 1.1 by 21.267.288.4+21.2
Following instructionsMuse Spark 1.1
- Multi-ChallengeMuse Spark 1.1 by 16.35975.3+16.3
- LiveBench · Instruction FollowingMuse Spark 1.1 by 762.569.6+7
Other results9 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 Agentic IndexClaude Opus 4.5 by 32.159.627.5+32.1
- ToolathlonMuse Spark 1.1 by 32.143.575.6+32.1
- Artificial Analysis Coding IndexMuse Spark 1.1 by 23.547.871.3+23.5
- AA-OmniscienceMuse Spark 1.1 by 14.11428.1+14.1
- DeepSearchQA (F1)Muse Spark 1.1 by 8.876.184.9+8.8
- CyberGymMuse Spark 1.1 by 8.450.659+8.4
- livebench_languageClaude Opus 4.5 by 781.374.3+7
- AA IntelligenceMuse Spark 1.1 by 4.629.133.7+4.6
- livebench_data_analysisClaude Opus 4.5 by 1.874.472.5+1.8
Questions people ask
Which is better, Claude Opus 4.5 or Muse Spark 1.1?
Muse Spark 1.1 wins six of the eight areas we test: coding, agents, reasoning, facts, images and charts and following instructions. Claude Opus 4.5 wins math. They are level on long documents.
Which is better for coding?
Muse Spark 1.1. It wins 4 of the 5 coding tests both models report; Claude Opus 4.5 wins 1.
Which is cheaper?
Claude Opus 4.5 costs $5.00 per million input tokens and $25.00 per million output tokens; Muse Spark 1.1 costs $1.25 and $4.25. That makes Muse Spark 1.1 about 82% cheaper for the same work.
How do you compare the two?
We use the 29 benchmark tests both models have published scores on. The verdict counts the 20 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 9 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.