Claude Opus 5.5 vs Muse Ember
Claude Opus 5.5 leads the LLM Stats Score 58.7 to 45.9. Muse Ember is 40.0x cheaper per token.
Anthropic · Meta · Updated for 2026
Which is better?
Claude Opus 5.5 leads the overall LLM Stats Score 58.7 to 45.9, ranking #3 overall.
In the 1 individual benchmarks reported for both models, Claude Opus 5.5 wins 1; this is a narrower head-to-head signal than the composite indexes.
On price, Muse Ember is roughly 40.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Muse Ember 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 Opus 5.5
- overall performance matters — it scores 58.7 and ranks #3 on LLM Stats
- your work emphasizes coding and agents — it leads those capability indexes
- you value its reported benchmark strengths — it wins 1 of 1 exact shared results
Choose Muse Ember
- cost matters — it's about 40.0x 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 Nov 2026
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
32 reported for Claude Opus 5.5 · 6 for Muse Ember
Claude Opus 5.5 outperforms in 1 benchmarks (Terminal-Bench 4.0), while Muse Ember is better at 0 benchmarks.
Claude Opus 5.5 significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Claude Opus 5.5 ($4.00/1M tokens) is 40.0x more expensive than Muse Ember ($0.10/1M tokens).
For output processing, Claude Opus 5.5 ($20.00/1M tokens) is 40.0x more expensive than Muse Ember ($0.50/1M tokens).
In conclusion, Claude Opus 5.5 is more expensive than Muse Ember.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Muse Ember accepts 1,048,576 input tokens compared to Claude Opus 5.5's 1,000,000 tokens. Muse Ember can generate longer responses up to 524,288 tokens, while Claude Opus 5.5 is limited to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Claude Opus 5.5 and Muse Ember support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude Opus 5.5
Muse Ember
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Claude Opus 5.5 was released on 2026-09-22, while Muse Ember was released on 2026-11-09.
Muse Ember is 2 months newer than Claude Opus 5.5.
Sep 22, 2026
1 months ago
Nov 9, 2026
3 days ago
1mo newerKnowledge Cutoff
When training data ends
Claude Opus 5.5 has a documented knowledge cutoff of 2026-06-01, while Muse Ember's cutoff date is not specified.
We can confirm Claude Opus 5.5's training data extends to 2026-06-01, but cannot make a direct comparison without Muse Ember's cutoff date.
Jun 2026
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Provider Availability
Claude Opus 5.5 is available from Anthropic. Muse Ember is available from Meta Model API.
Claude Opus 5.5
Muse Ember
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Opus 5.5 and Muse Ember side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Opus 5.5 vs Muse Ember.