Claude Fable 5 vs Muse Spark Open
Wins 7 of 7 areas
Coding · Agents · Reasoning · Facts · Images and charts · Math · Long documents
Wins 0 of 7 areas
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Claude Fable 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 thinking30Claude Fable 53 of 3 tests
- CodingWriting and fixing software20Claude Fable 52 of 2 tests
- AgentsCarrying out multi-step tasks on its own20Claude Fable 52 of 2 tests
- MathCompetition and research-level math20Claude Fable 52 of 2 tests
- FactsGetting facts right instead of making them up21Claude Fable 52 of 3 tests
- Images and chartsUnderstanding pictures, charts and video10Claude Fable 51 of 1 test
- Long documentsFinding answers in very long texts10Claude Fable 51 of 1 test
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 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 pulls ahead
- Extremely hard research-level math problemsFrontierMath Tier 4+58.5points ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+34.3points ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+26.1points ahead
Where Muse Spark Open pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+39.5points 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.
CodingClaude Fable 5
- Terminal-Bench 2.1Claude Fable 5 by 8.284.676.4+8.2
- SciCodeClaude Fable 5 by 2.66158.4+2.6
AgentsClaude Fable 5
- Terminal-Bench 4.0Claude Fable 5 by 34.342.48.1+34.3
- GDPValClaude Fable 5 by 10.455.545.1+10.4
ReasoningClaude Fable 5
- CritPtClaude Fable 5 by 13.728.614.9+13.7
- Humanity's Last ExamClaude Fable 5 by 11.655.543.9+11.6
- GPQA DiamondClaude Fable 5 by 3.692.689+3.6
FactsClaude Fable 5
- AA-Omniscience · Non-hallucinationMuse Spark Open by 39.536.475.9+39.5
- AA-Omniscience · AccuracyClaude Fable 5 by 26.165.339.3+26.1
- SimpleQA VerifiedClaude Fable 5 by 14.170.756.6+14.1
Images and chartsClaude Fable 5
- MMMU-ProClaude Fable 5 by 3.384.280.9+3.3
MathClaude Fable 5
- FrontierMath Tier 4Claude Fable 5 by 58.590.231.7+58.5
- FrontierMath Tiers 1-3 (v2)Claude Fable 5 by 17.28769.8+17.2
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 Fable 5 by 18.643.324.6+18.6
- AA IntelligenceClaude Fable 5 by 10.749.638.9+10.7
Questions people ask
Which is better, Claude Fable 5 or Muse Spark Open?
Claude Fable 5 wins all seven areas where both have results: coding, agents, reasoning, facts, images and charts, math and long documents. Muse Spark Open wins none, but costs 91% less.
Which is better for coding?
Claude Fable 5. It wins 2 of the 2 coding tests both models report; Muse Spark Open wins none.
Which is cheaper?
Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; Muse Spark Open costs $1.25 and $4.25. That makes Muse Spark Open about 91% 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.