Grok-4 Heavy vs Solar Pro 4
Grok-4 Heavy leads the LLM Stats Score 40.7 to 35.2.
xAI · Upstage · Updated for 2026
Which is better?
Grok-4 Heavy leads the overall LLM Stats Score 40.7 to 35.2, ranking #54 overall.
In the 2 individual benchmarks reported for both models, Solar Pro 4 wins 2; 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
- overall performance matters — it scores 40.7 and ranks #54 on LLM Stats
Choose Solar Pro 4
- you value its reported benchmark strengths — it wins 2 of 2 exact shared results
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
6 reported for Grok-4 Heavy · 9 for Solar Pro 4
Grok-4 Heavy outperforms in 0 benchmarks, while Solar Pro 4 is better at 2 benchmarks (GPQA, LiveCodeBench).
Solar Pro 4 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 Solar Pro 4 specifies input context (524,288 tokens). Only Solar Pro 4 specifies output context (131,072 tokens).
Input capabilities
Documented input modalities across available providers
Grok-4 Heavy supports multimodal inputs, whereas Solar Pro 4 does not.
Grok-4 Heavy can handle both text and other forms of data like images, making it suitable for multimodal applications.
Grok-4 Heavy
Solar Pro 4
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
Solar Pro 4 was released on 2026-08-06, while Grok-4 Heavy's release date is not specified.
We can confirm Solar Pro 4's release timeline, but cannot make a direct age comparison without Grok-4 Heavy's release date.
—
Aug 6, 2026
1 months ago
Knowledge Cutoff
When training data ends
Grok-4 Heavy has a documented knowledge cutoff of 2024-12-31, while Solar Pro 4'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 Solar Pro 4's cutoff date.
Dec 2024
—
Outputs Comparison
Judge for yourself.
Run your own prompts against Grok-4 Heavy and Solar Pro 4 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Grok-4 Heavy vs Solar Pro 4.