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Claude Mythos Preview vs LongCat-2.5

Claude Mythos Preview leads the LLM Stats Score 54.3 to 50.0. LongCat-2.5 is 95.2x cheaper per token.

Anthropic · Meituan · Updated for 2026

Which is better?

Claude Mythos Preview leads the overall LLM Stats Score 54.3 to 50.0, ranking #7 overall.

The models split the 2 individual benchmarks reported for both models evenly.

On price, LongCat-2.5 is roughly 95.2x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

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

Choose Claude Mythos Preview

  • overall performance matters — it scores 54.3 and ranks #7 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes

Choose LongCat-2.5

  • cost matters — it's about 95.2x cheaper per token

At a glance

The differences that matter most.

Claude Mythos Preview
Anthropic
LongCat-2.5
Meituan
Core performance indexes
LLM Stats Score
54.3
#7
50.0
#20
Reasoning
55.1
#4
48.3
#21
Coding
44.2
#5
38.6
#27
Agents
36.5
#22
36.3
#23
Cost, coverage & limits
Benchmark wins
1 of 2
1 of 2
Input price
$25.00 / M
$0.30 / M
Output price
$125.00 / M
$1.20 / M
Context window
—
1,048,576

Capability indexes

Additional strengths measured across groups of related public benchmarks

3 shared
Index
Claude Mythos Preview
LongCat-2.5
Math
47.6#1
37.2#37
Vision
40.0#5
32.5#29
Multimodal
36.9#7
34.8#15
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

16 reported for Claude Mythos Preview · 23 for LongCat-2.5

2 shared

Claude Mythos Preview outperforms in 1 benchmarks (CharXiv-R), while LongCat-2.5 is better at 1 benchmark (BrowseComp).

Both models are evenly matched across the 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

LongCat-2.5 costs less

For input processing, Claude Mythos Preview ($25.00/1M tokens) is 83.3x more expensive than LongCat-2.5 ($0.30/1M tokens).

For output processing, Claude Mythos Preview ($125.00/1M tokens) is 104.2x more expensive than LongCat-2.5 ($1.20/1M tokens).

In conclusion, Claude Mythos Preview is more expensive than LongCat-2.5.*

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

Lowest available price from all providers
Wed Nov 04 2026 • llm-stats.com
Anthropic
Claude Mythos Preview
Input tokens$25.00
Output tokens$125.00
Best providerAnthropic
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

Only LongCat-2.5 specifies input context (1,048,576 tokens). Only LongCat-2.5 specifies output context (131,072 tokens).

Anthropic
Claude Mythos Preview
Input- tokens
Output- 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 Claude Mythos Preview and LongCat-2.5 support multimodal inputs.

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

Claude Mythos Preview

Text
Images
Audio
Video

LongCat-2.5

Text
Images
Audio
Video

Release Timeline

When each model was launched

LongCat-2.5 was released on 2026-11-01, while Claude Mythos Preview's release date is not specified.

We can confirm LongCat-2.5's release timeline, but cannot make a direct age comparison without Claude Mythos Preview's release date.

Claude Mythos Preview

—

LongCat-2.5

Nov 1, 2026

3 days 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

Claude Mythos Preview is available from Anthropic. LongCat-2.5 is available from Meituan.

Claude Mythos Preview

anthropic logo
Anthropic
Input Price:Input: $25.00/1MOutput Price:Output: $125.00/1M

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 Claude Mythos Preview and LongCat-2.5 side-by-side, then vote on the output you prefer.

Claude Mythos Preview
✓ Preferred
LongCat-2.5
Open in Playground

FAQ

Common questions about Claude Mythos Preview vs LongCat-2.5.

Which is better, Claude Mythos Preview or LongCat-2.5?

Claude Mythos Preview leads the LLM Stats Score 54.3 to 50.0. Claude Mythos Preview is made by Anthropic 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 Claude Mythos Preview compare to LongCat-2.5 in benchmarks?

Claude Mythos Preview scores CyBench: 100.0%, USAMO25: 97.6%, GPQA: 94.6%, SWE-Bench Verified: 93.9%, CharXiv-R: 93.2%. 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 Claude Mythos Preview cheaper than LongCat-2.5?

LongCat-2.5 is 83.3x cheaper for input tokens. Claude Mythos Preview costs $25.00/M input and $125.00/M output via anthropic. LongCat-2.5 costs $0.30/M input and $1.20/M output via meituan.

What are the context window sizes for Claude Mythos Preview and LongCat-2.5?

Claude Mythos Preview supports an unknown number of 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 Claude Mythos Preview and LongCat-2.5?

Key differences include LLM Stats Score (54.3 vs 50.0), input pricing ($25.00 vs $0.30/M), licensing (Proprietary vs Unknown). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Mythos Preview and LongCat-2.5?

Claude Mythos Preview is developed by Anthropic and LongCat-2.5 is developed by Meituan.

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