The AI arena is free today

Open Superagent

Claude Mythos Preview vs Muse Ember

Claude Mythos Preview and Muse Ember are closely matched at 53.8 and 45.9 on the LLM Stats Score. Muse Ember is 250.0x cheaper per token.

Anthropic · Meta · Updated for 2026

Which is better?

Claude Mythos Preview and Muse Ember are closely matched on the overall LLM Stats Score at 53.8 and 45.9.

On price, Muse Ember is roughly 250.0x 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 Ember

  • cost matters — it's about 250.0x cheaper per token

At a glance

The differences that matter most.

Claude Mythos Preview
Anthropic
Muse Ember
Meta
Core performance indexes
LLM Stats Score
53.8
#8
45.9
#47
Reasoning
54.7
#5
48.1
#24
Coding
42.7
#7
27.3
#85
Agents
35.2
#25
31.6
#45
Cost, coverage & limits
Benchmark wins
—
—
Input price
$25.00 / M
$0.10 / M
Output price
$125.00 / M
$0.50 / M
Context window
—
1,048,576

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
Claude Mythos Preview
Muse Ember
Vision
39.4#5
23.4#78
Multimodal
36.3#8
23.6#74
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

16 reported for Claude Mythos Preview · 6 for Muse Ember

No common benchmarks found

Claude Mythos Preview and Muse Emberdon'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 Ember costs less

For input processing, Claude Mythos Preview ($25.00/1M tokens) is 250.0x more expensive than Muse Ember ($0.10/1M tokens).

For output processing, Claude Mythos Preview ($125.00/1M tokens) is 250.0x more expensive than Muse Ember ($0.50/1M tokens).

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

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

Lowest available price from all providers
Thu Nov 12 2026 • llm-stats.com
Anthropic
Claude Mythos Preview
Input tokens$25.00
Output tokens$125.00
Best providerAnthropic
Meta
Muse Ember
Input tokens$0.10
Output tokens$0.50
Best providerMeta
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

Only Muse Ember specifies input context (1,048,576 tokens). Only Muse Ember specifies output context (524,288 tokens).

Anthropic
Claude Mythos Preview
Input- tokens
Output- tokens
Meta
Muse Ember
Input1,048,576 tokens
Output524,288 tokens
Thu Nov 12 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Mythos Preview and Muse Ember 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 Ember

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 Ember

Proprietary

Closed source

Release Timeline

When each model was launched

Muse Ember was released on 2026-11-09, while Claude Mythos Preview's release date is not specified.

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

Claude Mythos Preview

—

Muse Ember

Nov 9, 2026

3 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 Ember is available from Meta Model API.

Claude Mythos Preview

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

Muse Ember

meta logo
Meta
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Claude Mythos Preview and Muse Ember side-by-side, then vote on the output you prefer.

Claude Mythos Preview
✓ Preferred
Muse Ember
Open in Playground

FAQ

Common questions about Claude Mythos Preview vs Muse Ember.

Which is better, Claude Mythos Preview or Muse Ember?

Claude Mythos Preview and Muse Ember are closely matched on the LLM Stats Score at 53.8 and 45.9. Claude Mythos Preview is made by Anthropic and Muse Ember 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 Ember 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 Ember scores PerceptionBench: 80.6%, OSWorld 2.1 (partial): 69.5%, Agents' Last Exam: 61.6%, Personal Superintelligence Index: 46.8%, Terminal-Bench 4.0: 40.9%.

Is Claude Mythos Preview cheaper than Muse Ember?

Muse Ember is 250.0x cheaper for input tokens. Claude Mythos Preview costs $25.00/M input and $125.00/M output via anthropic. Muse Ember costs $0.10/M input and $0.50/M output via meta.

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

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

Key differences include LLM Stats Score (53.8 vs 45.9), 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 Ember?

Claude Mythos Preview is developed by Anthropic and Muse Ember is developed by Meta.

Related comparisons