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LongCat-2.5 vs SWE-2 Flash

LongCat-2.5 and SWE-2 Flash are closely matched at 49.4 and 43.8 on the LLM Stats Score.

Meituan · Cognition · Updated for 2026

Which is better?

LongCat-2.5 and SWE-2 Flash are closely matched on the overall LLM Stats Score at 49.4 and 43.8.

In the 4 individual benchmarks reported for both models, LongCat-2.5 wins 3; this is a narrower head-to-head signal than the composite indexes.

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

Choose LongCat-2.5

  • you value its reported benchmark strengths — it wins 3 of 4 exact shared results

Choose SWE-2 Flash

  • you want the most recent training data — it shipped Nov 2026

At a glance

The differences that matter most.

LongCat-2.5
Meituan
SWE-2 Flash
Cognition
Core performance indexes
LLM Stats Score
49.4
#24
43.8
#59
Reasoning
47.9
#27
42.6
#61
Coding
36.9
#29
33.0
#44
Agents
34.8
#27
30.1
#50
Cost, coverage & limits
Benchmark wins
3 of 4
1 of 4
Input price
$0.30 / M
— / M
Output price
$1.20 / M
— / M
Context window
1,048,576
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
LongCat-2.5
SWE-2 Flash
Tool use
29.3#25
23.0#58
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

23 reported for LongCat-2.5 · 7 for SWE-2 Flash

4 shared

LongCat-2.5 outperforms in 3 benchmarks (DeepSWE 1.1, SWE Atlas - Codebase QnA, Terminal-Bench 4.0), while SWE-2 Flash is better at 1 benchmark (Terminal-Bench 2.1).

LongCat-2.5 shows notably better performance in the majority of benchmarks.

Thu Nov 12 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Model Size

Parameter count comparison

1324.0B diff

LongCat-2.5 has 1324.0B more parameters than SWE-2 Flash, making it 479.7% larger.

Meituan
LongCat-2.5
1.6Tparameters
Cognition
SWE-2 Flash
276.0Bparameters
1600.0B
LongCat-2.5
276.0B
SWE-2 Flash

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).

Meituan
LongCat-2.5
Input1,048,576 tokens
Output131,072 tokens
Cognition
SWE-2 Flash
Input- tokens
Output- tokens
Thu Nov 12 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

LongCat-2.5 supports multimodal inputs, whereas SWE-2 Flash does not.

LongCat-2.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

LongCat-2.5

Text
Images
Audio
Video

SWE-2 Flash

Text
Images
Audio
Video

Release Timeline

When each model was launched

LongCat-2.5 was released on 2026-11-01, while SWE-2 Flash was released on 2026-11-04.

SWE-2 Flash is 0 month newer than LongCat-2.5.

LongCat-2.5

Nov 1, 2026

1 weeks ago

SWE-2 Flash

Nov 4, 2026

1 weeks ago

3d 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

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against LongCat-2.5 and SWE-2 Flash side-by-side, then vote on the output you prefer.

LongCat-2.5
✓ Preferred
SWE-2 Flash
Open in Playground

FAQ

Common questions about LongCat-2.5 vs SWE-2 Flash.

Which is better, LongCat-2.5 or SWE-2 Flash?

LongCat-2.5 and SWE-2 Flash are closely matched on the LLM Stats Score at 49.4 and 43.8. LongCat-2.5 is made by Meituan and SWE-2 Flash is made by Cognition. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does LongCat-2.5 compare to SWE-2 Flash in benchmarks?

LongCat-2.5 scores MathVision: 96.5%, BrowseComp: 91.9%, CharXiv-R: 90.2%, Terminal-Bench 2.1: 88.4%, Video-MME: 85.2%. SWE-2 Flash scores Terminal-Bench 2.1: 89.2%, DeepSWE 1.1: 60.1%, SWE Atlas - Codebase QnA: 50.0%, FrontierCode 1.1: 45.5%, ExploitBench: 34.8%.

What are the context window sizes for LongCat-2.5 and SWE-2 Flash?

LongCat-2.5 supports 1.0M tokens and SWE-2 Flash supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between LongCat-2.5 and SWE-2 Flash?

Key differences include LLM Stats Score (49.4 vs 43.8), multimodal support (yes vs no), licensing (Unknown vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes LongCat-2.5 and SWE-2 Flash?

LongCat-2.5 is developed by Meituan and SWE-2 Flash is developed by Cognition.

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