Muse Spark 1.3 vs Claude Fable 5.1

Pyyan / Compare / Muse Spark 1.3 vs Claude Fable 5.1

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Language Models · verified 5 Sept 2026

Muse Spark 1.3Metacurrent

Claude Fable 5.1Anthropiccurrent

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Specification	Muse Spark 1.3	Claude Fable 5.1
Summary	A quarter fewer tokens than 1.2 for the same work, which is the figure on the bill.	Same price as Fable 5, and cache reads cost a quarter of what they did.
Context	1M	1M
Input ($/Mtok)	$1.25	$10
Output ($/Mtok)	$4.25	$50
Licence	Proprietary	Proprietary
Max output	Not published	128K
Parameters	Not published	Not published
Released	2 Sep 2026	1 Sep 2026
Model ID	muse-spark-1.3	claude-fable-5-1
Category	Language Models	Language Models
Official	—	—

Highlighted rows are where these differ.

About 20% fewer tool calls and 25% fewer tokens than 1.2 to reach the same result
75.4 on DeepSWE v1.1 and 98.5 on MRCR long context between 256K and 512K
A Contributor tier costs $0.10 in and $0.20 out for the same model, in exchange for letting Meta train on your prompts

Best for long running agentic coding.

Matches or beats Fable 5 at low and medium effort, and pulls clear at high effort
Cache reads cut to 25% of the old price, so re-reading a long context got much cheaper
Identical model to Mythos 5.1 underneath; the difference is the safeguards

Best for coding and long-running work.