Ember-1 vs GPT-5.5 Pro
Ember-1 and GPT-5.5 Pro are closely matched at 43.1 and 45.5 on the LLM Stats Score. Ember-1 is 11.3x cheaper per token.
Fireworks AI · OpenAI · Updated for 2026
Which is better?
Ember-1 and GPT-5.5 Pro are closely matched on the overall LLM Stats Score at 43.1 and 45.5.
On price, Ember-1 is roughly 11.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-5.5 Pro 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
- cost matters — it's about 11.3x cheaper per token
- you want the most recent training data — it shipped Sep 2026
Choose GPT-5.5 Pro
- you process long inputs — it offers a 1,050,000 token context window
At a glance
The differences that matter most.
Individual benchmarks
4 reported for Ember-1 · 5 for GPT-5.5 Pro
Ember-1 and GPT-5.5 Prodon'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, Ember-1 ($3.00/1M tokens) is 10.0x cheaper than GPT-5.5 Pro ($30.00/1M tokens).
For output processing, Ember-1 ($15.00/1M tokens) is 12.0x cheaper than GPT-5.5 Pro ($180.00/1M tokens).
In conclusion, GPT-5.5 Pro 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 Pro accepts 1,050,000 input tokens compared to Ember-1's 1,040,000 tokens. Only GPT-5.5 Pro specifies output context (128,000 tokens).
Input capabilities
Documented input modalities across available providers
GPT-5.5 Pro supports multimodal inputs, whereas Ember-1 does not.
GPT-5.5 Pro can handle both text and other forms of data like images, making it suitable for multimodal applications.
Ember-1
GPT-5.5 Pro
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 Pro was released on 2026-04-23.
Ember-1 is 5 months newer than GPT-5.5 Pro.
Sep 23, 2026
2 weeks ago
5mo newerApr 23, 2026
5 months ago
Knowledge Cutoff
When training data ends
GPT-5.5 Pro has a documented knowledge cutoff of 2025-12-01, while Ember-1's cutoff date is not specified.
We can confirm GPT-5.5 Pro'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 Pro is available from OpenAI.
Ember-1
GPT-5.5 Pro
Outputs Comparison
Judge for yourself.
Run your own prompts against Ember-1 and GPT-5.5 Pro side-by-side, then vote on the output you prefer.
FAQ
Common questions about Ember-1 vs GPT-5.5 Pro.