Model Comparison

Claude Opus 4.5 vs LongCat-Flash-ChatWhich is better in 2026?

Claude Opus 4.5 significantly outperforms across most benchmarks. LongCat-Flash-Chat is 19.0x cheaper per token.

Verdict: Claude Opus 4.5 vs LongCat-Flash-Chat — which is better?

Claude Opus 4.5 (by Anthropic) 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.

Claude Opus 4.5 outperforms in 4 benchmarks (GPQA, SWE-Bench Verified, Tau2 Retail, Tau2 Telecom), while LongCat-Flash-Chat is better at 0 benchmarks. Claude Opus 4.5 significantly outperforms across most benchmarks.

On price, LongCat-Flash-Chat is roughly 19.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Claude Opus 4.5 also accepts a larger context window (200,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose Claude Opus 4.5 if…

  • you want the strongest raw capability — it leads on 4 of 4 shared benchmarks
  • you process long inputs — it offers a 200,000 token context window
  • you want the most recent training data — it shipped Nov 2025

Choose LongCat-Flash-Chat if…

  • cost matters — it's about 19.0x cheaper per token
  • you need open weights you can self-host or fine-tune
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Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

Claude Opus 4.5 outperforms in 4 benchmarks (GPQA, SWE-Bench Verified, Tau2 Retail, Tau2 Telecom), while LongCat-Flash-Chat is better at 0 benchmarks.

Claude Opus 4.5 significantly outperforms across most benchmarks.

Fri Jun 12 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

LongCat-Flash-Chat costs less

For input processing, Claude Opus 4.5 ($5.00/1M tokens) is 16.7x more expensive than LongCat-Flash-Chat ($0.30/1M tokens).

For output processing, Claude Opus 4.5 ($25.00/1M tokens) is 20.8x more expensive than LongCat-Flash-Chat ($1.20/1M tokens).

In conclusion, Claude Opus 4.5 is more expensive than LongCat-Flash-Chat.*

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

Lowest available price from all providers
Fri Jun 12 2026 • llm-stats.com
Anthropic
Claude Opus 4.5
Input tokens$5.00
Output tokens$25.00
Best providerAnthropic
Meituan
LongCat-Flash-Chat
Input tokens$0.30
Output tokens$1.20
Best providerMeituan
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Claude Opus 4.5 accepts 200,000 input tokens compared to LongCat-Flash-Chat's 128,000 tokens. LongCat-Flash-Chat can generate longer responses up to 128,000 tokens, while Claude Opus 4.5 is limited to 64,000 tokens.

Anthropic
Claude Opus 4.5
Input200,000 tokens
Output64,000 tokens
Meituan
LongCat-Flash-Chat
Input128,000 tokens
Output128,000 tokens
Fri Jun 12 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Claude Opus 4.5 supports multimodal inputs, whereas LongCat-Flash-Chat does not.

Claude Opus 4.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Opus 4.5

Text
Images
Audio
Video

LongCat-Flash-Chat

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Opus 4.5 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.

Claude Opus 4.5

Proprietary

Closed source

LongCat-Flash-Chat

MIT

Open weights

Release Timeline

When each model was launched

Claude Opus 4.5 was released on 2025-11-24, while LongCat-Flash-Chat was released on 2025-08-29.

Claude Opus 4.5 is 3 months newer than LongCat-Flash-Chat.

Claude Opus 4.5

Nov 24, 2025

6 months ago

2mo newer
LongCat-Flash-Chat

Aug 29, 2025

9 months ago

Knowledge Cutoff

When training data ends

Claude Opus 4.5 has a documented knowledge cutoff of 2025-03-31, while LongCat-Flash-Chat's cutoff date is not specified.

We can confirm Claude Opus 4.5's training data extends to 2025-03-31, but cannot make a direct comparison without LongCat-Flash-Chat's cutoff date.

Claude Opus 4.5

Mar 2025

LongCat-Flash-Chat

—

Provider Availability

Claude Opus 4.5 is available from Anthropic. LongCat-Flash-Chat is available from Meituan.

Claude Opus 4.5

anthropic logo
Anthropic
Input Price:Input: $5.00/1MOutput Price:Output: $25.00/1M

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

Anthropic
Larger context window (200,000 tokens)
Supports multimodal inputs
Higher GPQA score (87.0% vs 73.2%)
Higher SWE-Bench Verified score (80.9% vs 60.4%)
Higher Tau2 Retail score (88.9% vs 71.3%)
Higher Tau2 Telecom score (98.2% vs 73.7%)
Meituan
Less expensive input tokens
Less expensive output tokens
Has open weights

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Opus 4.5
Meituan
LongCat-Flash-Chat

FAQ

Common questions about Claude Opus 4.5 vs LongCat-Flash-Chat.

Which is better, Claude Opus 4.5 or LongCat-Flash-Chat?

Claude Opus 4.5 significantly outperforms across most benchmarks. Claude Opus 4.5 is made by Anthropic 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 Claude Opus 4.5 compare to LongCat-Flash-Chat in benchmarks?

Claude Opus 4.5 scores Tau2 Telecom: 98.2%, MMMLU: 90.8%, Tau2 Retail: 88.9%, GPQA: 87.0%, SWE-Bench Verified: 80.9%. LongCat-Flash-Chat scores MATH-500: 96.4%, MMLU: 89.7%, IFEval: 89.6%, ZebraLogic: 89.3%, HumanEval: 88.4%.

Is Claude Opus 4.5 cheaper than LongCat-Flash-Chat?

LongCat-Flash-Chat is 16.7x cheaper for input tokens. Claude Opus 4.5 costs $5.00/M input and $25.00/M output via anthropic. LongCat-Flash-Chat costs $0.30/M input and $1.20/M output via meituan.

What are the context window sizes for Claude Opus 4.5 and LongCat-Flash-Chat?

Claude Opus 4.5 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 Claude Opus 4.5 and LongCat-Flash-Chat?

Key differences include context window (200K vs 128K), input pricing ($5.00 vs $0.30/M), multimodal support (yes vs no), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 4.5 and LongCat-Flash-Chat?

Claude Opus 4.5 is developed by Anthropic and LongCat-Flash-Chat is developed by Meituan.

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