GPT-5.5 vs Muse Spark 1.1
Wins 6 of 8 areas
Agents · Reasoning · Facts · Math · Long documents · Following instructions
Wins 1 of 8 areas
Coding
GPT-5.5 is the stronger all-rounder.Muse Spark 1.1 is cheaper and better at coding.
Scores updated · 41 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 thinking30GPT-5.53 of 4 tests · 1 tie
- AgentsCarrying out multi-step tasks on its own32GPT-5.53 of 5 tests
- FactsGetting facts right instead of making them up21GPT-5.52 of 3 tests
- MathCompetition and research-level math10GPT-5.51 of 1 test
- Long documentsFinding answers in very long texts10GPT-5.51 of 1 test
- Following instructionsDoing exactly what it is asked10GPT-5.51 of 1 test
- CodingWriting and fixing software24Muse Spark 1.14 of 6 tests
- Images and chartsUnderstanding pictures, charts and video00Even0 each · 1 tie
Images and charts, math, 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.
Muse Spark 1.1 costs 84% less for the same work.
The biggest differences
The three tests each model wins by the widest margin. Scores are out of 100.
Where GPT-5.5 pulls ahead
- Research-level physics problemsCritPt+12points ahead
- Fresh competition math problemsLiveBench · Mathematics+8.8points ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+8.5points ahead
Where Muse Spark 1.1 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+39points ahead
- Multi-step tasks using many real software toolsMCP Atlas+12.8points ahead
- Fixes real GitHub issues, working as an agentLiveBench · Agentic Coding+4.5points ahead
Every test, side by side
All 41 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingMuse Spark 1.1
- Terminal-Bench 2.1GPT-5.5 by 6.484.377.9+6.4
- LiveBench · CodingGPT-5.5 by 582.277.2+5
- LiveBench · Agentic CodingMuse Spark 1.1 by 4.55458.5+4.5
- SciCodeMuse Spark 1.1 by 355.858.8+3
- LMArena · WebDevMuse Spark 1.1 by 29 rating points15131542+29 rating
- SWE-bench ProMuse Spark 1.1 by 2.958.661.5+2.9
AgentsGPT-5.5
- MCP AtlasMuse Spark 1.1 by 12.875.388.1+12.8
- Terminal-Bench 4.0GPT-5.5 by 8.514.66.1+8.5
- τ-Bench V3 · BankingGPT-5.5 by 7.23931.8+7.2
- GDPValGPT-5.5 by 742.735.7+7
- OSWorld-VerifiedMuse Spark 1.1 by 2.178.780.8+2.1
ReasoningGPT-5.5
- CritPtGPT-5.5 by 1227.115.1+12
- GPQA DiamondGPT-5.5 by 3.793.589.8+3.7
- LiveBench · ReasoningGPT-5.5 by 289.787.7+2
- Humanity's Last Examtie45.846.2tie
FactsGPT-5.5
- AA-Omniscience · Non-hallucinationMuse Spark 1.1 by 391150+39
- AA-Omniscience · AccuracyGPT-5.5 by 5.95852+5.9
- SimpleQA VerifiedGPT-5.5 by 5.26357.8+5.2
Following instructionsGPT-5.5
- LiveBench · Instruction FollowingGPT-5.5 by 1.170.769.6+1.1
Other results19 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.
- CyberGymGPT-5.5 by 22.881.859+22.8
- HLE CalibrationGPT-5.5 by 20.844.223.4+20.8
- BabyVisionMuse Spark 1.1 by 20.455.976.3+20.4
- ToolathlonMuse Spark 1.1 by 2055.675.6+20
- JobBenchMuse Spark 1.1 by 16.438.354.7+16.4
- DeepSWE 1.1GPT-5.5 by 146753+14
- livebench_languageGPT-5.5 by 13.187.474.3+13.1
- GDPval-AA v2 EloGPT-5.5 by 110 rating points14911381+110 rating
- AA Agentic IndexGPT-5.5 by 9.837.327.5+9.8
- AIRS-BenchGPT-5.5 by 98677+9
- livebench_data_analysisGPT-5.5 by 981.672.5+9
- AA-OmniscienceMuse Spark 1.1 by 7.620.528.1+7.6
- HealthBench ProfessionalMuse Spark 1.1 by 7.551.859.3+7.5
- Finance Agent v2Muse Spark 1.1 by 5.451.857.2+5.4
- AA IntelligenceGPT-5.5 by 4.738.433.7+4.7
- Artificial Analysis Coding IndexGPT-5.5 by 3.674.971.3+3.6
- Toolathlon VerifiedMuse Spark 1.1 by 2.173.575.6+2.1
- OR-Bench (FRR)GPT-5.5 by 1.96.74.8+1.9
- WMDPMuse Spark 1.1 by 1.585.587+1.5
Questions people ask
Which is better, GPT-5.5 or Muse Spark 1.1?
GPT-5.5 wins six of the eight areas we test: agents, reasoning, facts, math, long documents and following instructions. Muse Spark 1.1 wins coding, and costs 84% less. They are level on images and charts.
Which is better for coding?
Muse Spark 1.1. It wins 4 of the 6 coding tests both models report; GPT-5.5 wins 2.
Which is cheaper?
GPT-5.5 costs $5.00 per million input tokens and $30.00 per million output tokens; Muse Spark 1.1 costs $1.25 and $4.25. That makes Muse Spark 1.1 about 84% cheaper for the same work.
How do you compare the two?
We use the 41 benchmark tests both models have published scores on. The verdict counts the 22 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 19 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.