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Grok 4 Fast vs LongCat-2.5

LongCat-2.5 leads the LLM Stats Score 50.0 to 31.0. Grok 4 Fast is 1.9x cheaper per token.

xAI · Meituan · Updated for 2026

Which is better?

LongCat-2.5 leads the overall LLM Stats Score 50.0 to 31.0, ranking #20 overall.

In the 1 individual benchmarks reported for both models, LongCat-2.5 wins 1; this is a narrower head-to-head signal than the composite indexes.

On price, Grok 4 Fast is roughly 1.9x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Grok 4 Fast also accepts a larger context window (2,000,000 input tokens), making it the stronger choice for long documents and large codebases.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Grok 4 Fast

  • cost matters — it's about 1.9x cheaper per token
  • you process long inputs — it offers a 2,000,000 token context window

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
  • you value its reported benchmark strengths — it wins 1 of 1 exact shared results
  • you want the most recent training data — it shipped Nov 2026

At a glance

The differences that matter most.

Grok 4 Fast
xAI
LongCat-2.5
Meituan
Core performance indexes
LLM Stats Score
31.0
#142
50.0
#20
Reasoning
30.0
#149
48.3
#21
Coding
18.1
#142
38.6
#27
Agents
1.9
#203
36.3
#23
Cost, coverage & limits
Benchmark wins
0 of 1
1 of 1
Input price
$0.20 / M
$0.30 / M
Output price
$0.50 / M
$1.20 / M
Context window
2,000,000
1,048,576

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Grok 4 Fast
LongCat-2.5
Math
27.1#110
37.2#37
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

7 reported for Grok 4 Fast · 23 for LongCat-2.5

1 shared

Grok 4 Fast outperforms in 0 benchmarks, while LongCat-2.5 is better at 1 benchmark (BrowseComp).

LongCat-2.5 significantly outperforms across most benchmarks.

Wed Nov 04 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Grok 4 Fast costs less

For input processing, Grok 4 Fast ($0.20/1M tokens) is 1.5x cheaper than LongCat-2.5 ($0.30/1M tokens).

For output processing, Grok 4 Fast ($0.50/1M tokens) is 2.4x cheaper than LongCat-2.5 ($1.20/1M tokens).

In conclusion, LongCat-2.5 is more expensive than Grok 4 Fast.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Wed Nov 04 2026 • llm-stats.com
xAI
Grok 4 Fast
Input tokens$0.20
Output tokens$0.50
Best providerxAI
Meituan
LongCat-2.5
Input tokens$0.30
Output tokens$1.20
Best providerMeituan
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

Grok 4 Fast accepts 2,000,000 input tokens compared to LongCat-2.5's 1,048,576 tokens. LongCat-2.5 can generate longer responses up to 131,072 tokens, while Grok 4 Fast is limited to 30,000 tokens.

xAI
Grok 4 Fast
Input2,000,000 tokens
Output30,000 tokens
Meituan
LongCat-2.5
Input1,048,576 tokens
Output131,072 tokens
Wed Nov 04 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

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

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

Grok 4 Fast

Text
Images
Audio
Video

LongCat-2.5

Text
Images
Audio
Video

Release Timeline

When each model was launched

Grok 4 Fast was released on 2025-08-28, while LongCat-2.5 was released on 2026-11-01.

LongCat-2.5 is 14 months newer than Grok 4 Fast.

Grok 4 Fast

Aug 28, 2025

1.2 years ago

LongCat-2.5

Nov 1, 2026

3 days ago

1.2yr newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

Grok 4 Fast is available from xAI. LongCat-2.5 is available from Meituan.

Grok 4 Fast

xai logo
xAI
Input Price:Input: $0.20/1MOutput Price:Output: $0.50/1M

LongCat-2.5

meituan logo
Meituan
Input Price:Input: $0.30/1MOutput Price:Output: $1.20/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

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

Grok 4 Fast
✓ Preferred
LongCat-2.5
Open in Playground

FAQ

Common questions about Grok 4 Fast vs LongCat-2.5.

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

LongCat-2.5 leads the LLM Stats Score 50.0 to 31.0. Grok 4 Fast 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 Fast compare to LongCat-2.5 in benchmarks?

Grok 4 Fast scores SimpleQA: 95.0%, HMMT 2025: 93.3%, AIME 2025: 92.0%, GPQA: 85.7%, LiveCodeBench: 80.0%. LongCat-2.5 scores MathVision: 96.5%, BrowseComp: 91.9%, CharXiv-R: 90.2%, Terminal-Bench 2.1: 88.4%, Video-MME: 85.2%.

Is Grok 4 Fast cheaper than LongCat-2.5?

Grok 4 Fast is 1.5x cheaper for input tokens. Grok 4 Fast costs $0.20/M input and $0.50/M output via xai. LongCat-2.5 costs $0.30/M input and $1.20/M output via meituan.

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

Grok 4 Fast supports 2.0M 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 Fast and LongCat-2.5?

Key differences include LLM Stats Score (31.0 vs 50.0), context window (2.0M vs 1.0M), input pricing ($0.20 vs $0.30/M), licensing (Proprietary vs Unknown). See the full comparison above for benchmark-by-benchmark results.

Who makes Grok 4 Fast and LongCat-2.5?

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

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