Grok-4 Heavy vs LongCat-Flash-Thinking
Grok-4 Heavy leads the LLM Stats Score 40.7 to 28.6.
xAI · Meituan · Updated for 2026
Which is better?
Grok-4 Heavy leads the overall LLM Stats Score 40.7 to 28.6, ranking #54 overall.
In the 3 individual benchmarks reported for both models, Grok-4 Heavy 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
- your work emphasizes reasoning — it leads those capability indexes
- you value its reported benchmark strengths — it wins 2 of 3 exact shared results
Choose LongCat-Flash-Thinking
- you need open weights you can self-host or fine-tune
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 · 14 for LongCat-Flash-Thinking
Grok-4 Heavy outperforms in 2 benchmarks (AIME 2025, GPQA), while LongCat-Flash-Thinking is better at 0 benchmarks.
Grok-4 Heavy shows notably better performance in the majority of benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Context Window
Maximum input and output token capacity
Only LongCat-Flash-Thinking specifies input context (128,000 tokens). Only LongCat-Flash-Thinking specifies output context (128,000 tokens).
Input capabilities
Documented input modalities across available providers
Grok-4 Heavy supports multimodal inputs, whereas LongCat-Flash-Thinking 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
LongCat-Flash-Thinking
License
Usage and distribution terms
Grok-4 Heavy is licensed under a proprietary license, while LongCat-Flash-Thinking uses MIT.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
MIT
Open weights
Release Timeline
When each model was launched
LongCat-Flash-Thinking was released on 2025-09-22, while Grok-4 Heavy's release date is not specified.
We can confirm LongCat-Flash-Thinking's release timeline, but cannot make a direct age comparison without Grok-4 Heavy's release date.
—
Sep 22, 2025
11 months ago
Knowledge Cutoff
When training data ends
Grok-4 Heavy has a documented knowledge cutoff of 2024-12-31, while LongCat-Flash-Thinking'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 LongCat-Flash-Thinking's cutoff date.
Dec 2024
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Outputs Comparison
Judge for yourself.
Run your own prompts against Grok-4 Heavy and LongCat-Flash-Thinking side-by-side, then vote on the output you prefer.
FAQ
Common questions about Grok-4 Heavy vs LongCat-Flash-Thinking.