Ember-1 vs Grok-4 Heavy
Ember-1 and Grok-4 Heavy are closely matched at 43.1 and 40.6 on the LLM Stats Score.
Fireworks AI · xAI · Updated for 2026
Which is better?
Ember-1 and Grok-4 Heavy are closely matched on the overall LLM Stats Score at 43.1 and 40.6.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Ember-1
- your work emphasizes coding — it leads those capability indexes
Choose Grok-4 Heavy
- you are already invested in the xAI ecosystem
At a glance
The differences that matter most.
Individual benchmarks
4 reported for Ember-1 · 6 for Grok-4 Heavy
Ember-1 and Grok-4 Heavydon'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
Context Window
Maximum input and output token capacity
Only Ember-1 specifies input context (1,040,000 tokens).
Input capabilities
Documented input modalities across available providers
Grok-4 Heavy supports multimodal inputs, whereas Ember-1 does not.
Grok-4 Heavy can handle both text and other forms of data like images, making it suitable for multimodal applications.
Ember-1
Grok-4 Heavy
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 Grok-4 Heavy's release date is not specified.
We can confirm Ember-1's release timeline, but cannot make a direct age comparison without Grok-4 Heavy's release date.
Sep 23, 2026
2 weeks ago
—
Knowledge Cutoff
When training data ends
Grok-4 Heavy has a documented knowledge cutoff of 2024-12-31, while Ember-1's cutoff date is not specified.
We can confirm Grok-4 Heavy's training data extends to 2024-12-31, but cannot make a direct comparison without Ember-1's cutoff date.
—
Dec 2024
Outputs Comparison
Judge for yourself.
Run your own prompts against Ember-1 and Grok-4 Heavy side-by-side, then vote on the output you prefer.
FAQ
Common questions about Ember-1 vs Grok-4 Heavy.