GPT-5.5 vs Muse Ember
GPT-5.5 and Muse Ember are closely matched at 46.7 and 45.9 on the LLM Stats Score. Muse Ember is 56.3x cheaper per token.
OpenAI · Meta · Updated for 2026
Which is better?
GPT-5.5 and Muse Ember are closely matched on the overall LLM Stats Score at 46.7 and 45.9.
On price, Muse Ember is roughly 56.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-5.5 also accepts a larger context window (1,050,000 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 GPT-5.5
- you process long inputs — it offers a 1,050,000 token context window
Choose Muse Ember
- cost matters — it's about 56.3x cheaper per token
- 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
28 reported for GPT-5.5 · 6 for Muse Ember
GPT-5.5 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
For input processing, GPT-5.5 ($5.00/1M tokens) is 50.0x more expensive than Muse Ember ($0.10/1M tokens).
For output processing, GPT-5.5 ($30.00/1M tokens) is 60.0x more expensive than Muse Ember ($0.50/1M tokens).
In conclusion, GPT-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
GPT-5.5 accepts 1,050,000 input tokens compared to Muse Ember's 1,048,576 tokens. Muse Ember can generate longer responses up to 524,288 tokens, while GPT-5.5 is limited to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
Both GPT-5.5 and Muse Ember support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-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
GPT-5.5 was released on 2026-04-23, while Muse Ember was released on 2026-11-09.
Muse Ember is 7 months newer than GPT-5.5.
Apr 23, 2026
6 months ago
Nov 9, 2026
3 days ago
6mo newerKnowledge Cutoff
When training data ends
GPT-5.5 has a documented knowledge cutoff of 2025-12-01, while Muse Ember's cutoff date is not specified.
We can confirm GPT-5.5's training data extends to 2025-12-01, but cannot make a direct comparison without Muse Ember's cutoff date.
Dec 2025
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Provider Availability
GPT-5.5 is available from OpenAI. Muse Ember is available from Meta Model API.
GPT-5.5
Muse Ember
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-5.5 and Muse Ember side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-5.5 vs Muse Ember.