All tasks / Comparisons

Claude Fable 5.1 vs Muse Spark 1.3

Compared only on public benchmark results, across the 7 tasks where both are listed: Claude Fable 5.1 is a tier higher in 3 of 7 shared tasks, Muse Spark 1.3 in 1, they share a tier in 3.

Claude Fable 5.1

Anthropic's highest-priced Claude tier, positioned for demanding reasoning and long-horizon agentic work.

Vendor: Anthropic
Weights: Closed: API and apps only
Released: 1 Sep 2026
API price: $10 in / $50 out per 1M tokens
License: proprietary
Last verified: 18 Oct 2026

Alternatives to Claude Fable 5.1

Muse Spark 1.3

Meta's mid-tier proprietary Muse model line, offered through Meta's API.

Vendor: Meta
Weights: Closed: API and apps only
Released: Sep 2026
API price: $1.25 in / $4.25 out per 1M tokens
License: proprietary
Last verified: 18 Oct 2026

Alternatives to Muse Spark 1.3

Task by task

Task	Claude Fable 5.1	Muse Spark 1.3	Higher tier
Chat & assistants Models	S1,502 on LMArena Text Arena (overall, style control) · Cloud	S1,494 on LMArena Text Arena (overall, style control) · Cloud	Same tier
Writing Models	S1,485 on LMArena Text Arena: Creative Writing (style control) · Cloud	A1,461 on LMArena Text Arena: Creative Writing (style control) · Cloud	Claude Fable 5.1
Coding Models	A1,742 on LMArena WebDev / Code Arena (overall) · Cloud	B1,659 on LMArena WebDev / Code Arena (overall) · Cloud	Claude Fable 5.1
Image understanding Models	S1,286 on LMArena Vision Arena (overall, style control) · Cloud	S1,290 on LMArena Vision Arena (overall, style control) · Cloud	Same tier
Vector graphics & logos Models	C1,300 on Design Arena SVG · Cloud	C1,323 on Design Arena SVG · Cloud	Same tier
Browser & computer agents Models	–No public result yet · Cloud	A39.3% on OSWorld 2.0 (end-to-end models) · Cloud	Muse Spark 1.3
Slides & presentations Models	S1,328 on Design Arena Python-PPTX Slides · Cloud	A1,244 on Design Arena Python-PPTX Slides · Cloud	Claude Fable 5.1

A tier spans a range of scores, and small gaps on a leaderboard are often within its margin of error, so only a different tier counts as ahead. How we rank.

Same benchmark, both results

Benchmark	Claude Fable 5.1	Muse Spark 1.3	Snapshot
Artificial Analysis Intelligence Index Composite index over Artificial Analysis' own evaluation suite, higher is better	53 Claude Fable 5.1 (Max, Default Fallback)	48 Muse Spark 1.3 (Max)	18 Oct 2026
Design Arena Python-PPTX Slides Elo rating from crowdsourced blind pairwise votes on PowerPoint decks that models build with python-pptx in Design Arena's agent harness, higher is better	1,328 Claude Fable 5.1	1,244 Muse Spark 1.3 (xhigh)	18 Oct 2026
Design Arena SVG Elo rating from crowdsourced blind pairwise votes on SVG markup that models generate from a prompt (icons, illustrations, diagrams, artistic compositions), higher is better	1,300 Claude Fable 5.1	1,323 Muse Spark 1.3 Max	19 Oct 2026
EQ-Bench Creative Writing v3 Elo score from LLM-judged pairwise comparisons of creative-writing outputs (rubric score shown alongside), higher is better	2,162 claude-fable-5-1	1,906 muse-spark-1.3	24 Sep 2026
LMArena Text Arena (overall, style control) Arena score (Bradley-Terry rating from pairwise human votes, style-controlled default view), higher is better	1,502 Claude Fable 5.1 (Max)	1,494 Muse Spark 1.3 (Max)	15 Oct 2026
LMArena Text Arena: Creative Writing (style control) Arena score (Bradley-Terry rating from pairwise human votes, creative-writing prompts only, style-controlled view), higher is better	1,485 Claude Fable 5.1 (Max)	1,461 Muse Spark 1.3 (Max)	15 Oct 2026
LMArena Vision Arena (overall, style control) Arena score (Bradley-Terry rating from pairwise human votes on image + text prompts, style-controlled view), higher is better	1,286 claude-fable-5.1-max	1,290 muse-spark-1.3-max	9 Oct 2026
LMArena WebDev / Code Arena (overall) Arena score (Bradley-Terry rating from pairwise human votes on web-app generation), higher is better	1,742 Claude Fable 5.1 (Max)	1,659 Muse Spark 1.3 (Max)	18 Oct 2026