Ember-1 vs GPT-5.2 Pro
Ember-1 and GPT-5.2 Pro are closely matched at 43.1 and 42.8 on the LLM Stats Score. Ember-1 is 9.6x cheaper per token.
Fireworks AI · OpenAI · Updated for 2026
Which is better?
Ember-1 and GPT-5.2 Pro are closely matched on the overall LLM Stats Score at 43.1 and 42.8.
On price, Ember-1 is roughly 9.6x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Ember-1 also accepts a larger context window (1,040,000 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 9.6x cheaper per token
- you process long inputs — it offers a 1,040,000 token context window
- you want the most recent training data — it shipped Sep 2026
Choose GPT-5.2 Pro
- you want predictable pricing at $21.00/M input and $168.00/M output
At a glance
The differences that matter most.
Individual benchmarks
4 reported for Ember-1 · 7 for GPT-5.2 Pro
Ember-1 and GPT-5.2 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 7.0x cheaper than GPT-5.2 Pro ($21.00/1M tokens).
For output processing, Ember-1 ($15.00/1M tokens) is 11.2x cheaper than GPT-5.2 Pro ($168.00/1M tokens).
In conclusion, GPT-5.2 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
Ember-1 accepts 1,040,000 input tokens compared to GPT-5.2 Pro's 400,000 tokens. Only GPT-5.2 Pro specifies output context (128,000 tokens).
Input capabilities
Documented input modalities across available providers
GPT-5.2 Pro supports multimodal inputs, whereas Ember-1 does not.
GPT-5.2 Pro can handle both text and other forms of data like images, making it suitable for multimodal applications.
Ember-1
GPT-5.2 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-5.2 Pro was released on 2025-12-11.
Ember-1 is 10 months newer than GPT-5.2 Pro.
Sep 23, 2026
2 weeks ago
9mo newerDec 11, 2025
10 months ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Ember-1 is available from Fireworks. GPT-5.2 Pro is available from OpenAI.
Ember-1
GPT-5.2 Pro
Outputs Comparison
Judge for yourself.
Run your own prompts against Ember-1 and GPT-5.2 Pro side-by-side, then vote on the output you prefer.
FAQ
Common questions about Ember-1 vs GPT-5.2 Pro.