Ember-1 vs GPT-5.5
Ember-1 and GPT-5.5 are closely matched at 43.6 and 47.3 on the LLM Stats Score. Ember-1 is 1.9x cheaper per token.
Fireworks AI · OpenAI · Updated for 2026
Which is better?
Ember-1 and GPT-5.5 are closely matched on the overall LLM Stats Score at 43.6 and 47.3.
In the 1 individual benchmarks reported for both models, Ember-1 wins 1; this is a narrower head-to-head signal than the composite indexes.
On price, Ember-1 is roughly 1.9x 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 Ember-1
- you value its reported benchmark strengths — it wins 1 of 1 exact shared results
- cost matters — it's about 1.9x cheaper per token
- you want the most recent training data — it shipped Sep 2026
Choose GPT-5.5
- you process long inputs — it offers a 1,050,000 token context window
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
4 reported for Ember-1 · 28 for GPT-5.5
Ember-1 outperforms in 1 benchmarks (DeepSWE 1.1), while GPT-5.5 is better at 0 benchmarks.
Ember-1 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, Ember-1 ($3.00/1M tokens) is 1.7x cheaper than GPT-5.5 ($5.00/1M tokens).
For output processing, Ember-1 ($15.00/1M tokens) is 2.0x cheaper than GPT-5.5 ($30.00/1M tokens).
In conclusion, GPT-5.5 is more expensive than Ember-1.*
* 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 Ember-1's 1,040,000 tokens. Only GPT-5.5 specifies output context (128,000 tokens).
Input capabilities
Documented input modalities across available providers
GPT-5.5 supports multimodal inputs, whereas Ember-1 does not.
GPT-5.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.
Ember-1
GPT-5.5
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
Ember-1 was released on 2026-09-23, while GPT-5.5 was released on 2026-04-23.
Ember-1 is 5 months newer than GPT-5.5.
Sep 23, 2026
2 weeks ago
5mo newerApr 23, 2026
5 months ago
Knowledge Cutoff
When training data ends
GPT-5.5 has a documented knowledge cutoff of 2025-12-01, while Ember-1'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 Ember-1's cutoff date.
—
Dec 2025
Provider Availability
Ember-1 is available from Fireworks. GPT-5.5 is available from OpenAI.
Ember-1
GPT-5.5
Outputs Comparison
Judge for yourself.
Run your own prompts against Ember-1 and GPT-5.5 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Ember-1 vs GPT-5.5.