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longcat · Open weights

LongCat 2.0

Added Jun 30, 2026Open weights

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Use in the app

Meituan's LongCat 2.0 is an open-weight agentic model for coding, tool use, and long-context workflow automation, with reasoning disabled for faster direct answers.

  • Tools
Input
Text
Output
Text
Discovery tier
Open weights

Pricing

USD per 1M tokens
Input
$0.75
Output
$3.00
Cache read
$0.015

Reference prices as published by the model provider. API example

Specifications

Context window
1M
Max output
131.1K
Average output (7 days)
368 tokens
Longer than 38% of 468 models

Side by side

LongCat 2.0 compared

Specifications, prices, speed and benchmark scores next to each other. Benchmarks below show every compared model too.

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LongCat 2.0longcatThis modelLongCat 2.5 PreviewlongcatRemove
Providerlongcatlongcat
Discovery tierOpen weightsBalanced
AddedJun 30, 2026Sep 27, 2026
Limits
Context window1M1M
Max output131.07K131.07K
Average output368 tokens—
Pricing, USD per 1M tokens
Input$0.75$0.75
Output$3.00$2.95Best
Cache read$0.015$0.015
Performance
Request success (24h)100.0%Best99.7%
Benchmark indexes
Intelligence Index19.1—
Coding Index45.3—
Capabilities
ReasoningNoYes
ToolsYesYes
VisionNoYes
Reasoning effort——

Public evaluations

Benchmarks

Independent evaluation results, with how each score ranks among the models in the Noumen catalog.

  • LongCat 2.0
  • LongCat 2.5 Preview

Intelligence Index

  • LongCat 2.019.1
  • LongCat 2.5 Preview—

LongCat 2.0: Better than 48% of 326 scored models

3.8Catalog models by score55.1

Indexes

  • Coding Index

    Composite of the coding evaluations

    • LongCat 2.0: 45.3
    • LongCat 2.5 Preview: —

Agentic work

  • AutomationBench-AA

    Workflow automation, penalized for guardrail violations

    • LongCat 2.0: 4.5%
    • LongCat 2.5 Preview: —

  • AutomationBench-AA tasks completed

    Workflows finished end to end without a guardrail violation

    • LongCat 2.0: 0.5%
    • LongCat 2.5 Preview: —

  • AA-Briefcasev1.1

    Agentic knowledge work, rated head to head

    • LongCat 2.0: 739 Elo
    • LongCat 2.5 Preview: —

  • GDPval-AAv2.1

    Economically valuable occupational tasks, rated head to head

    • LongCat 2.0: 869 Elo
    • LongCat 2.5 Preview: —

Document reasoning

  • GDP.pdf

    Professional reasoning over PDF documents, all-pass rate

    • LongCat 2.0: 6.4%
    • LongCat 2.5 Preview: —

  • AA-LCRv1.1

    Reasoning across long documents

    • LongCat 2.0: 65.0%
    • LongCat 2.5 Preview: —

Reasoning and knowledge

  • Humanity’s Last Exam

    Expert-level questions across academic fields

    • LongCat 2.0: 33.7%
    • LongCat 2.5 Preview: —

  • GPQA Diamond

    Graduate-level science questions

    • LongCat 2.0: 78.0%
    • LongCat 2.5 Preview: —

Coding

  • Terminal-Benchv4.0

    Practical software engineering in a terminal

    • LongCat 2.0: 0.0%
    • LongCat 2.5 Preview: —

  • SciCode

    Scientific computing in Python

    • LongCat 2.0: 36.3%
    • LongCat 2.5 Preview: —

Legacy evaluations

  • AA-LCR (unversioned)

    Long-context reasoning, earlier grading

    • LongCat 2.0: 65.0%
    • LongCat 2.5 Preview: —

Scores from Artificial Analysis, updated Oct 26, 2026. Artificial Analysis

Live routing data

Performance and reliability

Recent averages across requests routed for this model. Your own speed depends on prompt length, reasoning effort and load.

Request success (24h)
100.0%
Reliable
Hourly request success · last 72 hoursLowest hour 97.6%
  • Healthy (98% or more)
  • Degraded (90–98%)
  • Down (under 90%)
  • No requests

Developers

Use it through the API

Noumen’s API is OpenAI-compatible: any Chat Completions client works with a base URL and a key.

Read the quickstart
curl https://www.noumen.xyz/api/v1/chat/completions \
  -H "Authorization: Bearer $NOUMEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "longcat-2.0",
    "messages": [{ "role": "user", "content": "Explain this stack trace." }]
  }'
import os
from openai import OpenAI

client = OpenAI(base_url="https://www.noumen.xyz/api/v1", api_key=os.environ["NOUMEN_API_KEY"])
reply = client.chat.completions.create(
    model="longcat-2.0",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

longcat

Other longcat models, starting with the same family.