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Claude Mythos Preview vs Muse Spark 1.3

Claude Mythos Preview and Muse Spark 1.3 are closely matched at 55.1 and 55.3 on the LLM Stats Score. Muse Spark 1.3 is 400.0x cheaper per token.

Anthropic · Meta · Updated for 2026

Which is better?

Claude Mythos Preview and Muse Spark 1.3 are closely matched on the overall LLM Stats Score at 55.1 and 55.3.

On price, Muse Spark 1.3 is roughly 400.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

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

Choose Claude Mythos Preview

  • you want predictable pricing at $25.00/M input and $125.00/M output

Choose Muse Spark 1.3

  • cost matters — it's about 400.0x cheaper per token

At a glance

The differences that matter most.

Claude Mythos Preview
Anthropic
Muse Spark 1.3
Meta
Core performance indexes
LLM Stats Score
55.1
#6
55.3
#5
Reasoning
55.9
#2
52.8
#7
Coding
44.9
#4
41.7
#10
Agents
36.2
#15
40.4
#4
Cost, coverage & limits
Benchmark wins
—
—
Input price
$25.00 / M
$0.10 / M
Output price
$125.00 / M
$0.20 / M
Context window
—
1,048,576

Individual benchmarks

16 reported for Claude Mythos Preview · 11 for Muse Spark 1.3

No common benchmarks found

Claude Mythos Preview and Muse Spark 1.3don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

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 Mythos Preview ($25.00/1M tokens) is 250.0x more expensive than Muse Spark 1.3 ($0.10/1M tokens).

For output processing, Claude Mythos Preview ($125.00/1M tokens) is 625.0x more expensive than Muse Spark 1.3 ($0.20/1M tokens).

In conclusion, Claude Mythos Preview is more expensive than Muse Spark 1.3.*

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

Lowest available price from all providers
Fri Sep 04 2026 • llm-stats.com
Anthropic
Claude Mythos Preview
Input tokens$25.00
Output tokens$125.00
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

Only Muse Spark 1.3 specifies input context (1,048,576 tokens). Only Muse Spark 1.3 specifies output context (943,718 tokens).

Anthropic
Claude Mythos Preview
Input- tokens
Output- tokens
Meta
Muse Spark 1.3
Input1,048,576 tokens
Output943,718 tokens
Fri Sep 04 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Mythos Preview and Muse Spark 1.3 support multimodal inputs.

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

Claude Mythos Preview

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 Mythos Preview

Proprietary

Closed source

Muse Spark 1.3

Proprietary

Closed source

Release Timeline

When each model was launched

Muse Spark 1.3 was released on 2026-09-02, while Claude Mythos Preview's release date is not specified.

We can confirm Muse Spark 1.3's release timeline, but cannot make a direct age comparison without Claude Mythos Preview's release date.

Claude Mythos Preview

—

Muse Spark 1.3

Sep 2, 2026

1 days ago

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 Mythos Preview is available from Anthropic. Muse Spark 1.3 is available from Meta Model API.

Claude Mythos Preview

anthropic logo
Anthropic
Input Price:Input: $25.00/1MOutput Price:Output: $125.00/1M

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 Mythos Preview and Muse Spark 1.3 side-by-side, then vote on the output you prefer.

Claude Mythos Preview
✓ Preferred
Muse Spark 1.3
Open in Playground

FAQ

Common questions about Claude Mythos Preview vs Muse Spark 1.3.

Which is better, Claude Mythos Preview or Muse Spark 1.3?

Claude Mythos Preview and Muse Spark 1.3 are closely matched on the LLM Stats Score at 55.1 and 55.3. Claude Mythos Preview 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 Mythos Preview compare to Muse Spark 1.3 in benchmarks?

Claude Mythos Preview scores CyBench: 100.0%, USAMO25: 97.6%, GPQA: 94.6%, SWE-Bench Verified: 93.9%, CharXiv-R: 93.2%. 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 Mythos Preview cheaper than Muse Spark 1.3?

Muse Spark 1.3 is 250.0x cheaper for input tokens. Claude Mythos Preview costs $25.00/M input and $125.00/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 Mythos Preview and Muse Spark 1.3?

Claude Mythos Preview supports an unknown number of 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 Mythos Preview and Muse Spark 1.3?

Key differences include LLM Stats Score (55.1 vs 55.3), input pricing ($25.00 vs $0.10/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Mythos Preview and Muse Spark 1.3?

Claude Mythos Preview is developed by Anthropic and Muse Spark 1.3 is developed by Meta.

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