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Kimi K2 0905 vs LongCat-Flash-Chat

Kimi K2 0905 and LongCat-Flash-Chat are closely matched at 21.6 and 19.8 on the LLM Stats Score. LongCat-Flash-Chat is 2.0x cheaper per token.

Moonshot AI · Meituan · Updated for 2026

Which is better?

Kimi K2 0905 and LongCat-Flash-Chat are closely matched on the overall LLM Stats Score at 21.6 and 19.8.

In the 4 individual benchmarks reported for both models, Kimi K2 0905 wins 3; this is a narrower head-to-head signal than the composite indexes.

On price, LongCat-Flash-Chat is roughly 2.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Kimi K2 0905 also accepts a larger context window (262,144 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 Kimi K2 0905

  • your work emphasizes coding — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 3 of 4 exact shared results
  • you process long inputs — it offers a 262,144 token context window
  • you want the most recent training data — it shipped Sep 2025

Choose LongCat-Flash-Chat

  • cost matters — it's about 2.0x cheaper per token
  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

Kimi K2 0905
Moonshot AI
LongCat-Flash-Chat
Meituan
Core performance indexes
LLM Stats Score
21.6
#201
19.8
#214
Reasoning
22.0
#188
19.7
#210
Coding
19.4
#113
12.3
#161
Cost, coverage & limits
Benchmark wins
3 of 4
1 of 4
Input price
$0.60 / M
$0.30 / M
Output price
$2.50 / M
$1.20 / M
Context window
262,144
128,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

3 shared
Index
Kimi K2 0905
LongCat-Flash-Chat
Math
24.3#123
18.9#180
Finance
26.6#43
26.2#50
Legal
26.6#32
26.2#39
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

6 reported for Kimi K2 0905 · 16 for LongCat-Flash-Chat

4 shared

Kimi K2 0905 outperforms in 3 benchmarks (GPQA, HumanEval, MMLU), while LongCat-Flash-Chat is better at 1 benchmark (MMLU-Pro).

Kimi K2 0905 shows notably better performance in the majority of benchmarks.

Fri Oct 09 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

LongCat-Flash-Chat costs less

For input processing, Kimi K2 0905 ($0.60/1M tokens) is 2.0x more expensive than LongCat-Flash-Chat ($0.30/1M tokens).

For output processing, Kimi K2 0905 ($2.50/1M tokens) is 2.1x more expensive than LongCat-Flash-Chat ($1.20/1M tokens).

In conclusion, Kimi K2 0905 is more expensive than LongCat-Flash-Chat.*

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

Lowest available price from all providers
Fri Oct 09 2026 • llm-stats.com
Moonshot AI
Kimi K2 0905
Input tokens$0.60
Output tokens$2.50
Best providerNovita
Meituan
LongCat-Flash-Chat
Input tokens$0.30
Output tokens$1.20
Best providerMeituan
Notice missing or incorrect data?

Model Size

Parameter count comparison

440.0B diff

Kimi K2 0905 has 440.0B more parameters than LongCat-Flash-Chat, making it 78.6% larger.

Moonshot AI
Kimi K2 0905
1.0Tparameters
Meituan
LongCat-Flash-Chat
560.0Bparameters
1000.0B
Kimi K2 0905
560.0B
LongCat-Flash-Chat

Context Window

Maximum input and output token capacity

Kimi K2 0905 accepts 262,144 input tokens compared to LongCat-Flash-Chat's 128,000 tokens. Kimi K2 0905 can generate longer responses up to 262,144 tokens, while LongCat-Flash-Chat is limited to 128,000 tokens.

Moonshot AI
Kimi K2 0905
Input262,144 tokens
Output262,144 tokens
Meituan
LongCat-Flash-Chat
Input128,000 tokens
Output128,000 tokens
Fri Oct 09 2026 • llm-stats.com

License

Usage and distribution terms

Kimi K2 0905 is licensed under a proprietary license, while LongCat-Flash-Chat uses MIT.

License differences may affect how you can use these models in commercial or open-source projects.

Kimi K2 0905

Proprietary

Closed source

LongCat-Flash-Chat

MIT

Open weights

Release Timeline

When each model was launched

Kimi K2 0905 was released on 2025-09-05, while LongCat-Flash-Chat was released on 2025-08-29.

Kimi K2 0905 is 0 month newer than LongCat-Flash-Chat.

Kimi K2 0905

Sep 5, 2025

1.1 years ago

1w newer
LongCat-Flash-Chat

Aug 29, 2025

1.1 years ago

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

Kimi K2 0905 is available from Novita. LongCat-Flash-Chat is available from Meituan.

Kimi K2 0905

novita logo
Novita
Input Price:Input: $0.60/1MOutput Price:Output: $2.50/1M

LongCat-Flash-Chat

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 Kimi K2 0905 and LongCat-Flash-Chat side-by-side, then vote on the output you prefer.

Kimi K2 0905
✓ Preferred
LongCat-Flash-Chat
Open in Playground

FAQ

Common questions about Kimi K2 0905 vs LongCat-Flash-Chat.

Which is better, Kimi K2 0905 or LongCat-Flash-Chat?

Kimi K2 0905 and LongCat-Flash-Chat are closely matched on the LLM Stats Score at 21.6 and 19.8. Kimi K2 0905 is made by Moonshot AI and LongCat-Flash-Chat is made by Meituan. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Kimi K2 0905 compare to LongCat-Flash-Chat in benchmarks?

Kimi K2 0905 scores HumanEval: 94.5%, MMLU: 90.2%, MATH: 89.1%, MMLU-Pro: 82.5%, GPQA: 75.8%. LongCat-Flash-Chat scores MATH-500: 96.4%, MMLU: 89.7%, IFEval: 89.6%, ZebraLogic: 89.3%, HumanEval: 88.4%.

Is Kimi K2 0905 cheaper than LongCat-Flash-Chat?

LongCat-Flash-Chat is 2.0x cheaper for input tokens. Kimi K2 0905 costs $0.60/M input and $2.50/M output via novita. LongCat-Flash-Chat costs $0.30/M input and $1.20/M output via meituan.

What are the context window sizes for Kimi K2 0905 and LongCat-Flash-Chat?

Kimi K2 0905 supports 262K tokens and LongCat-Flash-Chat supports 128K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Kimi K2 0905 and LongCat-Flash-Chat?

Key differences include LLM Stats Score (21.6 vs 19.8), context window (262K vs 128K), input pricing ($0.60 vs $0.30/M), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes Kimi K2 0905 and LongCat-Flash-Chat?

Kimi K2 0905 is developed by Moonshot AI and LongCat-Flash-Chat is developed by Meituan.

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