Claude Fable 5.1 vs Muse Spark 1.2
Wins 7 of 8 areas
Coding · Agents · Reasoning · Facts · Images and charts · Math · Long documents
Wins 1 of 8 areas
Following instructions
Claude Fable 5.1 is the stronger all-rounder.Muse Spark 1.2 is cheaper and better at following instructions.
Both rank among the ten best models we track in facts.
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.
- CodingWriting and fixing software50Claude Fable 5.15 of 5 tests
- ReasoningHard problems that need careful thinking50Claude Fable 5.15 of 5 tests
- AgentsCarrying out multi-step tasks on its own30Claude Fable 5.13 of 3 tests
- FactsGetting facts right instead of making them up21Claude Fable 5.12 of 3 tests
- Images and chartsUnderstanding pictures, charts and video10Claude Fable 5.11 of 1 test
- MathCompetition and research-level math10Claude Fable 5.11 of 1 test
- Long documentsFinding answers in very long texts10Claude Fable 5.11 of 1 test
- Following instructionsDoing exactly what it is asked01Muse Spark 1.21 of 1 test
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 1.2 costs 91% 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 Fable 5.1 pulls ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+44.9points ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+21.8points ahead
- Real work tasks from 44 professionsGDPVal+13.9points ahead
Where Muse Spark 1.2 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+39.3points ahead
- Follows detailed instructions exactlyLiveBench · Instruction Following+1.3points 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.
CodingClaude Fable 5.1
- LMArena · WebDevClaude Fable 5.1 by 213 rating points17451532+213 rating
- Terminal-Bench 2.1Claude Fable 5.1 by 11.391.480.1+11.3
- LiveBench · CodingClaude Fable 5.1 by 8.986.477.5+8.9
- LiveBench · Agentic CodingClaude Fable 5.1 by 8.566.157.6+8.5
- SciCodeClaude Fable 5.1 by 5.763.157.4+5.7
AgentsClaude Fable 5.1
- Terminal-Bench 4.0Claude Fable 5.1 by 44.9527.1+44.9
- GDPValClaude Fable 5.1 by 13.962.848.9+13.9
- τ-Bench V3 · BankingClaude Fable 5.1 by 12.447.234.8+12.4
ReasoningClaude Fable 5.1
- Humanity's Last ExamClaude Fable 5.1 by 13.659.145.5+13.6
- SimpleBenchClaude Fable 5.1 by 12.186.674.5+12.1
- CritPtClaude Fable 5.1 by 1229.717.7+12
- GPQA DiamondClaude Fable 5.1 by 3.393.790.4+3.3
- LiveBench · ReasoningClaude Fable 5.1 by 1.791.790+1.7
FactsClaude Fable 5.1
- AA-Omniscience · Non-hallucinationMuse Spark 1.2 by 39.327.466.7+39.3
- AA-Omniscience · AccuracyClaude Fable 5.1 by 21.867.245.4+21.8
- SimpleQA VerifiedClaude Fable 5.1 by 10.570.860.3+10.5
Images and chartsClaude Fable 5.1
- LMArena · VisionClaude Fable 5.1 by 15 rating points13201305+15 rating
Following instructionsMuse Spark 1.2
- LiveBench · Instruction FollowingMuse Spark 1.2 by 1.37374.3+1.3
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.
- GDP (Surge AI)Claude Fable 5.1 by 69.185.116+69.1
- GDPval-AA v2 EloClaude Fable 5.1 by 207 rating points18351628+207 rating
- AA-OmniscienceClaude Fable 5.1 by 16.343.527.2+16.3
- AA Agentic IndexClaude Fable 5.1 by 145844+14
- AA IntelligenceClaude Fable 5.1 by 13.853.439.6+13.8
- livebench_languageClaude Fable 5.1 by 10.989.578.6+10.9
- Artificial Analysis Coding IndexClaude Fable 5.1 by 9.481.672.2+9.4
- DeepSWE 1.1Claude Fable 5.1 by 8.167.459.3+8.1
- livebench_data_analysisClaude Fable 5.1 by 3.880.376.5+3.8
Questions people ask
Which is better, Claude Fable 5.1 or Muse Spark 1.2?
Claude Fable 5.1 wins seven of the eight areas we test: coding, agents, reasoning, facts, images and charts, math and long documents. Muse Spark 1.2 wins following instructions, and costs 91% less.
Which is better for coding?
Claude Fable 5.1. It wins 5 of the 5 coding tests both models report; Muse Spark 1.2 wins none.
Which is cheaper?
Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens; Muse Spark 1.2 costs $1.25 and $4.25. That makes Muse Spark 1.2 about 91% 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.