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Claude Mythos Preview vs Muse Spark 1.1

Claude Mythos Preview shows notably better performance in the majority of benchmarks. Muse Spark 1.1 is 25.0x cheaper per token.

Anthropic · Meta · Updated for 2026

Which is better?

Claude Mythos Preview outperforms in 3 benchmarks (CharXiv-R, Humanity's Last Exam, SWE-Bench Pro), while Muse Spark 1.1 is better at 1 benchmark (OSWorld-Verified). Claude Mythos Preview shows notably better performance in the majority of benchmarks.

On price, Muse Spark 1.1 is roughly 25.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Based on current benchmark, pricing, and model metadata for 2026.

Choose Claude Mythos Preview

  • you want the strongest raw capability — it leads on 3 of 4 shared benchmarks

Choose Muse Spark 1.1

  • cost matters — it's about 25.0x cheaper per token

At a glance

The differences that matter most.

Claude Mythos Preview
Anthropic
Muse Spark 1.1
Meta
Benchmark wins
3 of 4
1 of 4
Input price
$25.00 / M
$1.25 / M
Output price
$125.00 / M
$4.25 / M
Context window
—
1,048,576
Released
—
Jul 2026
License
Proprietary
Proprietary

Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

Claude Mythos Preview outperforms in 3 benchmarks (CharXiv-R, Humanity's Last Exam, SWE-Bench Pro), while Muse Spark 1.1 is better at 1 benchmark (OSWorld-Verified).

Claude Mythos Preview shows notably better performance in the majority of benchmarks.

Tue Aug 25 2026 • llm-stats.com

Arena Performance

Playground indexes and blind preference scores

Pricing Analysis

Price comparison per million tokens

Muse Spark 1.1 costs less

For input processing, Claude Mythos Preview ($25.00/1M tokens) is 20.0x more expensive than Muse Spark 1.1 ($1.25/1M tokens).

For output processing, Claude Mythos Preview ($125.00/1M tokens) is 29.4x more expensive than Muse Spark 1.1 ($4.25/1M tokens).

In conclusion, Claude Mythos Preview is more expensive than Muse Spark 1.1.*

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

Lowest available price from all providers
Tue Aug 25 2026 • llm-stats.com
Anthropic
Claude Mythos Preview
Input tokens$25.00
Output tokens$125.00
Best providerAnthropic
Meta
Muse Spark 1.1
Input tokens$1.25
Output tokens$4.25
Best providerMeta
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Only Muse Spark 1.1 specifies input context (1,048,576 tokens). Only Muse Spark 1.1 specifies output context (131,072 tokens).

Anthropic
Claude Mythos Preview
Input- tokens
Output- tokens
Meta
Muse Spark 1.1
Input1,048,576 tokens
Output131,072 tokens
Tue Aug 25 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Mythos Preview and Muse Spark 1.1 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 1.1

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 1.1

Proprietary

Closed source

Release Timeline

When each model was launched

Muse Spark 1.1 was released on 2026-07-09, while Claude Mythos Preview's release date is not specified.

We can confirm Muse Spark 1.1's release timeline, but cannot make a direct age comparison without Claude Mythos Preview's release date.

Claude Mythos Preview

—

Muse Spark 1.1

Jul 9, 2026

1 months 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 1.1 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 1.1

meta logo
Meta
Input Price:Input: $1.25/1MOutput Price:Output: $4.25/1M
* 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 1.1 side-by-side, then vote on the output you prefer.

Claude Mythos Preview
✓ Preferred
Muse Spark 1.1
Open in Playground

FAQ

Common questions about Claude Mythos Preview vs Muse Spark 1.1.

Which is better, Claude Mythos Preview or Muse Spark 1.1?

Claude Mythos Preview shows notably better performance in the majority of benchmarks. Claude Mythos Preview is made by Anthropic and Muse Spark 1.1 is made by Meta. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Mythos Preview compare to Muse Spark 1.1 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 1.1 scores CharXiv-R: 88.4%, MCP Atlas: 88.1%, OSWorld-Verified: 80.8%, Terminal-Bench 2.1: 80.0%, BabyVision: 76.3%.

Is Claude Mythos Preview cheaper than Muse Spark 1.1?

Muse Spark 1.1 is 20.0x cheaper for input tokens. Claude Mythos Preview costs $25.00/M input and $125.00/M output via anthropic. Muse Spark 1.1 costs $1.25/M input and $4.25/M output via meta.

What are the context window sizes for Claude Mythos Preview and Muse Spark 1.1?

Claude Mythos Preview supports an unknown number of tokens and Muse Spark 1.1 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 1.1?

Key differences include input pricing ($25.00 vs $1.25/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Mythos Preview and Muse Spark 1.1?

Claude Mythos Preview is developed by Anthropic and Muse Spark 1.1 is developed by Meta.

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