Model Comparison

Kimi K2 Instruct vs LongCat-Flash-ChatWhich is better in 2026?

LongCat-Flash-Chat shows notably better performance in the majority of benchmarks. Kimi K2 Instruct is 1.0x cheaper per token.

Verdict: Kimi K2 Instruct vs LongCat-Flash-Chat — which is better?

Kimi K2 Instruct (by Moonshot AI) and LongCat-Flash-Chat (by Meituan) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Kimi K2 Instruct outperforms in 4 benchmarks (GPQA, HumanEval, IFEval, MATH-500), while LongCat-Flash-Chat is better at 8 benchmarks (AIME 2025, MMLU, MMLU-Pro, Tau2 Airline, Tau2 Retail, Tau2 Telecom, Terminal-Bench, ZebraLogic). LongCat-Flash-Chat shows notably better performance in the majority of benchmarks.

Kimi K2 Instruct also accepts a larger context window (200,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose Kimi K2 Instruct if…

  • you process long inputs — it offers a 200,000 token context window

Choose LongCat-Flash-Chat if…

  • you want the strongest raw capability — it leads on 8 of 12 shared benchmarks
  • you want the most recent training data — it shipped Aug 2025

Performance Benchmarks

Comparative analysis across standard metrics

12 benchmarks

Kimi K2 Instruct outperforms in 4 benchmarks (GPQA, HumanEval, IFEval, MATH-500), while LongCat-Flash-Chat is better at 8 benchmarks (AIME 2025, MMLU, MMLU-Pro, Tau2 Airline, Tau2 Retail, Tau2 Telecom, Terminal-Bench, ZebraLogic).

LongCat-Flash-Chat shows notably better performance in the majority of benchmarks.

Tue Jul 21 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Kimi K2 Instruct costs less

For input processing, Kimi K2 Instruct ($0.50/1M tokens) is 1.7x more expensive than LongCat-Flash-Chat ($0.30/1M tokens).

For output processing, Kimi K2 Instruct ($0.50/1M tokens) is 2.4x cheaper than LongCat-Flash-Chat ($1.20/1M tokens).

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

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

Lowest available price from all providers
Tue Jul 21 2026 • llm-stats.com
Moonshot AI
Kimi K2 Instruct
Input tokens$0.50
Output tokens$0.50
Best providerFireworks
Meituan
LongCat-Flash-Chat
Input tokens$0.30
Output tokens$1.20
Best providerMeituan
Notice missing or incorrect data?Start an Issue→

Model Size

Parameter count comparison

440.0B diff

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

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

Context Window

Maximum input and output token capacity

Kimi K2 Instruct accepts 200,000 input tokens compared to LongCat-Flash-Chat's 128,000 tokens. Kimi K2 Instruct can generate longer responses up to 200,000 tokens, while LongCat-Flash-Chat is limited to 128,000 tokens.

Moonshot AI
Kimi K2 Instruct
Input200,000 tokens
Output200,000 tokens
Meituan
LongCat-Flash-Chat
Input128,000 tokens
Output128,000 tokens
Tue Jul 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 Instruct

MIT

Open weights

LongCat-Flash-Chat

MIT

Open weights

Release Timeline

When each model was launched

Kimi K2 Instruct was released on 2025-07-11, while LongCat-Flash-Chat was released on 2025-08-29.

LongCat-Flash-Chat is 2 months newer than Kimi K2 Instruct.

Kimi K2 Instruct

Jul 11, 2025

1.0 years ago

LongCat-Flash-Chat

Aug 29, 2025

10 months ago

1mo 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

Kimi K2 Instruct is available from Fireworks, Novita. LongCat-Flash-Chat is available from Meituan.

Kimi K2 Instruct

fireworks logo
Fireworks
Input Price:Input: $0.50/1MOutput Price:Output: $0.50/1M
novita logo
Novita
Input Price:Input: $0.57/1MOutput Price:Output: $2.30/1M

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?Start an Issue discussion→

Key Takeaways

Moonshot AI
Larger context window (200,000 tokens)
Less expensive output tokens
Higher GPQA score (75.1% vs 73.2%)
Higher HumanEval score (93.3% vs 88.4%)
Higher IFEval score (89.8% vs 89.6%)
Higher MATH-500 score (97.4% vs 96.4%)
Meituan
Less expensive input tokens
Higher AIME 2025 score (61.3% vs 49.5%)
Higher MMLU score (89.7% vs 89.5%)
Higher MMLU-Pro score (82.7% vs 81.1%)
Higher Tau2 Airline score (58.0% vs 56.5%)
Higher Tau2 Retail score (71.3% vs 70.6%)
Higher Tau2 Telecom score (73.7% vs 65.8%)
Higher Terminal-Bench score (39.5% vs 30.0%)
Higher ZebraLogic score (89.3% vs 89.0%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Kimi K2 Instruct and LongCat-Flash-Chat side-by-side, then vote on the output you prefer.

Kimi K2 Instruct
✓ Preferred
LongCat-Flash-Chat
Open in Playground
AI Model Comparison Table
Feature
Moonshot AI
Kimi K2 Instruct
Meituan
LongCat-Flash-Chat

FAQ

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

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

LongCat-Flash-Chat shows notably better performance in the majority of benchmarks. Kimi K2 Instruct is made by Moonshot AI and LongCat-Flash-Chat is made by Meituan. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

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

Kimi K2 Instruct scores MATH-500: 97.4%, GSM8k: 97.3%, CBNSL: 95.6%, HumanEval: 93.3%, MMLU-Redux: 92.7%. LongCat-Flash-Chat scores MATH-500: 96.4%, MMLU: 89.7%, IFEval: 89.6%, ZebraLogic: 89.3%, HumanEval: 88.4%.

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

LongCat-Flash-Chat is 1.7x cheaper for input tokens. Kimi K2 Instruct costs $0.50/M input and $0.50/M output via fireworks. LongCat-Flash-Chat costs $0.30/M input and $1.20/M output via meituan.

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

Kimi K2 Instruct supports 200K 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 Instruct and LongCat-Flash-Chat?

Key differences include context window (200K vs 128K), input pricing ($0.50 vs $0.30/M). See the full comparison above for benchmark-by-benchmark results.

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

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

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