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Claude Fable 5.1 vs Muse Spark 1.3

Claude Fable 5.1 and Muse Spark 1.3 are closely matched at 57.0 and 55.4 on the LLM Stats Score. Muse Spark 1.3 is 160.0x cheaper per token.

Anthropic · Meta · Updated for 2026

Which is better?

Claude Fable 5.1 and Muse Spark 1.3 are closely matched on the overall LLM Stats Score at 57.0 and 55.4.

In the 3 individual benchmarks reported for both models, Claude Fable 5.1 wins 2; this is a narrower head-to-head signal than the composite indexes.

On price, Muse Spark 1.3 is roughly 160.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Muse Spark 1.3 also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Claude Fable 5.1

  • you value its reported benchmark strengths — it wins 2 of 3 exact shared results

Choose Muse Spark 1.3

  • cost matters — it's about 160.0x cheaper per token
  • you process long inputs — it offers a 1,048,576 token context window
  • you want the most recent training data — it shipped Sep 2026

At a glance

The differences that matter most.

Claude Fable 5.1
Anthropic
Muse Spark 1.3
Meta
Core performance indexes
LLM Stats Score
57.0
#1
55.4
#5
Reasoning
54.5
#4
53.0
#6
Coding
37.0
#17
41.6
#9
Agents
42.2
#1
40.6
#4
Cost, coverage & limits
Benchmark wins
2 of 3
1 of 3
Input price
$10.00 / M
$0.10 / M
Output price
$50.00 / M
$0.20 / M
Context window
1,000,000
1,048,576

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Claude Fable 5.1
Muse Spark 1.3
Tool use
31.6#8
35.4#1
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

7 reported for Claude Fable 5.1 · 11 for Muse Spark 1.3

3 shared

Claude Fable 5.1 outperforms in 2 benchmarks (GDPval-AA, OSWorld 2.0), while Muse Spark 1.3 is better at 1 benchmark (AutomationBench).

Claude Fable 5.1 shows notably better performance in the majority of benchmarks.

Thu Sep 03 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Muse Spark 1.3 costs less

For input processing, Claude Fable 5.1 ($10.00/1M tokens) is 100.0x more expensive than Muse Spark 1.3 ($0.10/1M tokens).

For output processing, Claude Fable 5.1 ($50.00/1M tokens) is 250.0x more expensive than Muse Spark 1.3 ($0.20/1M tokens).

In conclusion, Claude Fable 5.1 is more expensive than Muse Spark 1.3.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Thu Sep 03 2026 • llm-stats.com
Anthropic
Claude Fable 5.1
Input tokens$10.00
Output tokens$50.00
Best providerAnthropic
Meta
Muse Spark 1.3
Input tokens$0.10
Output tokens$0.20
Best providerMeta
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Muse Spark 1.3 accepts 1,048,576 input tokens compared to Claude Fable 5.1's 1,000,000 tokens. Muse Spark 1.3 can generate longer responses up to 943,718 tokens, while Claude Fable 5.1 is limited to 128,000 tokens.

Anthropic
Claude Fable 5.1
Input1,000,000 tokens
Output128,000 tokens
Meta
Muse Spark 1.3
Input1,048,576 tokens
Output943,718 tokens
Thu Sep 03 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Fable 5.1 and Muse Spark 1.3 support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude Fable 5.1

Text
Images
Audio
Video

Muse Spark 1.3

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Claude Fable 5.1

Proprietary

Closed source

Muse Spark 1.3

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Fable 5.1 was released on 2026-09-01, while Muse Spark 1.3 was released on 2026-09-02.

Muse Spark 1.3 is 0 month newer than Claude Fable 5.1.

Claude Fable 5.1

Sep 1, 2026

1 days ago

Muse Spark 1.3

Sep 2, 2026

0 days ago

1d newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

Claude Fable 5.1 is available from Anthropic. Muse Spark 1.3 is available from Meta Model API.

Claude Fable 5.1

anthropic logo
Anthropic
Input Price:Input: $10.00/1MOutput Price:Output: $50.00/1M

Muse Spark 1.3

meta logo
Meta
Input Price:Input: $0.10/1MOutput Price:Output: $0.20/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Claude Fable 5.1 and Muse Spark 1.3 side-by-side, then vote on the output you prefer.

Claude Fable 5.1
✓ Preferred
Muse Spark 1.3
Open in Playground

FAQ

Common questions about Claude Fable 5.1 vs Muse Spark 1.3.

Which is better, Claude Fable 5.1 or Muse Spark 1.3?

Claude Fable 5.1 and Muse Spark 1.3 are closely matched on the LLM Stats Score at 57.0 and 55.4. Claude Fable 5.1 is made by Anthropic and Muse Spark 1.3 is made by Meta. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Fable 5.1 compare to Muse Spark 1.3 in benchmarks?

Claude Fable 5.1 scores OSWorld 2.0: 77.9%, CursorBench v3.2: 73.4%, Humanity's Last Exam: 65.0%, GDPval-AA: 61.8%, Terminal-Bench 4.0: 55.8%. Muse Spark 1.3 scores MRCR v2 (8-needle): 98.5%, MRCR v2 (8-needle, 512K-1M): 98.1%, DeepSearchQA: 89.4%, Terminal-Bench 2.1: 88.8%, DeepSWE 1.1: 75.4%.

Is Claude Fable 5.1 cheaper than Muse Spark 1.3?

Muse Spark 1.3 is 100.0x cheaper for input tokens. Claude Fable 5.1 costs $10.00/M input and $50.00/M output via anthropic. Muse Spark 1.3 costs $0.10/M input and $0.20/M output via meta.

What are the context window sizes for Claude Fable 5.1 and Muse Spark 1.3?

Claude Fable 5.1 supports 1.0M tokens and Muse Spark 1.3 supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Fable 5.1 and Muse Spark 1.3?

Key differences include LLM Stats Score (57.0 vs 55.4), context window (1.0M vs 1.0M), input pricing ($10.00 vs $0.10/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Fable 5.1 and Muse Spark 1.3?

Claude Fable 5.1 is developed by Anthropic and Muse Spark 1.3 is developed by Meta.

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