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Grok-4 Heavy vs LongCat-2.5

LongCat-2.5 leads the LLM Stats Score 50.0 to 40.3.

xAI · Meituan · Updated for 2026

Which is better?

LongCat-2.5 leads the overall LLM Stats Score 50.0 to 40.3, ranking #20 overall.

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 LongCat-2.5

  • overall performance matters — it scores 50.0 and ranks #20 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes

At a glance

The differences that matter most.

Grok-4 Heavy
xAI
LongCat-2.5
Meituan
Core performance indexes
LLM Stats Score
40.3
#78
50.0
#20
Reasoning
38.6
#80
48.3
#21
Coding
17.6
#143
38.6
#27
Cost, coverage & limits
Benchmark wins
—
—
Input price
— / M
$0.30 / M
Output price
— / M
$1.20 / M
Context window
—
1,048,576

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Grok-4 Heavy
LongCat-2.5
Math
41.7#10
37.2#37
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

6 reported for Grok-4 Heavy · 23 for LongCat-2.5

No common benchmarks found

Grok-4 Heavy and LongCat-2.5don'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 LongCat-2.5 specifies input context (1,048,576 tokens). Only LongCat-2.5 specifies output context (131,072 tokens).

xAI
Grok-4 Heavy
Input- tokens
Output- tokens
Meituan
LongCat-2.5
Input1,048,576 tokens
Output131,072 tokens
Sat Nov 07 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Grok-4 Heavy and LongCat-2.5 support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Grok-4 Heavy

Text
Images
Audio
Video

LongCat-2.5

Text
Images
Audio
Video

Release Timeline

When each model was launched

LongCat-2.5 was released on 2026-11-01, while Grok-4 Heavy's release date is not specified.

We can confirm LongCat-2.5's release timeline, but cannot make a direct age comparison without Grok-4 Heavy's release date.

Grok-4 Heavy

—

LongCat-2.5

Nov 1, 2026

6 days ago

Knowledge Cutoff

When training data ends

Grok-4 Heavy has a documented knowledge cutoff of 2024-12-31, while LongCat-2.5'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-2.5's cutoff date.

Grok-4 Heavy

Dec 2024

LongCat-2.5

—

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Grok-4 Heavy and LongCat-2.5 side-by-side, then vote on the output you prefer.

Grok-4 Heavy
✓ Preferred
LongCat-2.5
Open in Playground

FAQ

Common questions about Grok-4 Heavy vs LongCat-2.5.

Which is better, Grok-4 Heavy or LongCat-2.5?

LongCat-2.5 leads the LLM Stats Score 50.0 to 40.3. Grok-4 Heavy is made by xAI and LongCat-2.5 is made by Meituan. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Grok-4 Heavy compare to LongCat-2.5 in benchmarks?

Grok-4 Heavy scores AIME 2025: 100.0%, HMMT25: 96.7%, GPQA: 88.4%, LiveCodeBench: 79.4%, USAMO25: 61.9%. LongCat-2.5 scores MathVision: 96.5%, BrowseComp: 91.9%, CharXiv-R: 90.2%, Terminal-Bench 2.1: 88.4%, Video-MME: 85.2%.

What are the context window sizes for Grok-4 Heavy and LongCat-2.5?

Grok-4 Heavy supports an unknown number of tokens and LongCat-2.5 supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Grok-4 Heavy and LongCat-2.5?

Key differences include LLM Stats Score (40.3 vs 50.0), licensing (Proprietary vs Unknown). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok-4 Heavy and LongCat-2.5?

Grok-4 Heavy is developed by xAI and LongCat-2.5 is developed by Meituan.

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