Grok-4 Heavy vs Particle-1
Grok-4 Heavy and Particle-1 are closely matched at 40.2 and 31.9 on the LLM Stats Score.
xAI · Particle AI · Updated for 2026
Which is better?
Grok-4 Heavy and Particle-1 are closely matched on the overall LLM Stats Score at 40.2 and 31.9.
In the 1 individual benchmarks reported for both models, Particle-1 wins 1; this is a narrower head-to-head signal than the composite indexes.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Grok-4 Heavy
- you are already invested in the xAI ecosystem
Choose Particle-1
- you value its reported benchmark strengths — it wins 1 of 1 exact shared results
At a glance
The differences that matter most.
Individual benchmarks
6 reported for Grok-4 Heavy · 3 for Particle-1
Grok-4 Heavy outperforms in 0 benchmarks, while Particle-1 is better at 1 benchmark (GPQA).
Particle-1 significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Context Window
Maximum input and output token capacity
Only Particle-1 specifies input context (1,048,576 tokens). Only Particle-1 specifies output context (131,072 tokens).
Input capabilities
Documented input modalities across available providers
Both Grok-4 Heavy and Particle-1 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Grok-4 Heavy
Particle-1
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
Particle-1 was released on 2026-10-28, while Grok-4 Heavy's release date is not specified.
We can confirm Particle-1's release timeline, but cannot make a direct age comparison without Grok-4 Heavy's release date.
—
Oct 28, 2026
-3 days ago
Knowledge Cutoff
When training data ends
Grok-4 Heavy has a documented knowledge cutoff of 2024-12-31, while Particle-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 Particle-1's cutoff date.
Dec 2024
—
Outputs Comparison
Judge for yourself.
Run your own prompts against Grok-4 Heavy and Particle-1 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Grok-4 Heavy vs Particle-1.