Model Comparison

Kimi K2 Base vs LongCat-Flash-Thinking-2601

LongCat-Flash-Thinking-2601 significantly outperforms across most benchmarks.

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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Kimi K2 Base outperforms in 0 benchmarks, while LongCat-Flash-Thinking-2601 is better at 1 benchmark (GPQA).

LongCat-Flash-Thinking-2601 significantly outperforms across most benchmarks.

Thu May 21 2026 • llm-stats.com

Arena Performance

Human preference votes

Model Size

Parameter count comparison

440.0B diff

Kimi K2 Base has 440.0B more parameters than LongCat-Flash-Thinking-2601, making it 78.6% larger.

Moonshot AI
Kimi K2 Base
1.0Tparameters
Meituan
LongCat-Flash-Thinking-2601
560.0Bparameters
1000.0B
Kimi K2 Base
560.0B
LongCat-Flash-Thinking-2601

Context Window

Maximum input and output token capacity

Only LongCat-Flash-Thinking-2601 specifies input context (128,000 tokens). Only LongCat-Flash-Thinking-2601 specifies output context (128,000 tokens).

Moonshot AI
Kimi K2 Base
Input- tokens
Output- tokens
Meituan
LongCat-Flash-Thinking-2601
Input128,000 tokens
Output128,000 tokens
Thu May 21 2026 • llm-stats.com

License

Usage and distribution terms

Both models are licensed under MIT.

Both models share the same licensing terms, providing consistent usage rights.

Kimi K2 Base

MIT

Open weights

LongCat-Flash-Thinking-2601

MIT

Open weights

Release Timeline

When each model was launched

Kimi K2 Base was released on 2025-07-11, while LongCat-Flash-Thinking-2601 was released on 2026-01-14.

LongCat-Flash-Thinking-2601 is 6 months newer than Kimi K2 Base.

Kimi K2 Base

Jul 11, 2025

10 months ago

LongCat-Flash-Thinking-2601

Jan 14, 2026

4 months ago

6mo 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

Outputs Comparison

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Key Takeaways

Moonshot AI

No standout differentiators in the data we have for this pair.

Meituan
Larger context window (128,000 tokens)
Higher GPQA score (80.5% vs 48.1%)

Detailed Comparison

AI Model Comparison Table
Feature
Moonshot AI
Kimi K2 Base
Meituan
LongCat-Flash-Thinking-2601

FAQ

Common questions about Kimi K2 Base vs LongCat-Flash-Thinking-2601.

Which is better, Kimi K2 Base or LongCat-Flash-Thinking-2601?

LongCat-Flash-Thinking-2601 significantly outperforms across most benchmarks. Kimi K2 Base is made by Moonshot AI and LongCat-Flash-Thinking-2601 is made by Meituan. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Kimi K2 Base compare to LongCat-Flash-Thinking-2601 in benchmarks?

Kimi K2 Base scores C-Eval: 92.5%, GSM8k: 92.1%, MMLU-redux-2.0: 90.2%, MMLU: 87.8%, TriviaQA: 85.1%. LongCat-Flash-Thinking-2601 scores AIME 2025: 99.6%, Tau2 Telecom: 99.3%, Tau2 Retail: 88.6%, LiveCodeBench: 82.8%, GPQA: 80.5%.

What are the context window sizes for Kimi K2 Base and LongCat-Flash-Thinking-2601?

Kimi K2 Base supports an unknown number of tokens and LongCat-Flash-Thinking-2601 supports 128K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes Kimi K2 Base and LongCat-Flash-Thinking-2601?

Kimi K2 Base is developed by Moonshot AI and LongCat-Flash-Thinking-2601 is developed by Meituan.