longcat · Balanced

LongCat 2.5 Preview

Added Sep 27, 2026

LongCat 2.5 Preview is Meituan's multimodal model for long-context analysis, coding, and agent workflows. It supports image input, tool calling, optional extended thinking, a 1M-token context window, and up to 128K output tokens.

Reasoning
Tools
Vision

Input: Text, Images
Output: Text
Discovery tier: Balanced

Pricing

USD per 1M tokens

Input: $0.75
Output: $2.95
Cache read: $0.015

Reference prices as published by the model provider. API example

Specifications

Context window: 1M
Max output: 131.1K

Side by side

LongCat 2.5 Preview compared

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

Limits
	LongCat 2.5 PreviewlongcatThis model	ERNIE 5.1baiduRemove
Provider	longcat	baidu
Discovery tier	Balanced	Balanced
Added	Sep 27, 2026	May 10, 2026
Context window	1MBest	119K
Max output	131.07KBest	64K
Average output	—	1.9K tokens
Pricing, USD per 1M tokens
Input	$0.75	$0.75
Output	$2.95Best	$3.00
Cache read	$0.015Best	$0.75
Performance
Request success (24h)	99.7%	—
Capabilities
Reasoning	Yes	No
Tools	Yes	No
Vision	Yes	No
Reasoning effort	—	—

Public evaluations

Benchmarks

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

LongCat 2.5 Preview
ERNIE 5.1

Leaderboard	LongCat 2.5 Preview	ERNIE 5.1
Search Overall	Not in top 20	#9 · 1226.7

Ranks among Noumen catalog models on LMArena leaderboards. Only top-20 placements are listed.LMArena

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.

Prompt cache hits: 79.0%; About $0.17 per 1M input tokens with caching
Request success (24h): 99.7%; Reliable

Cache hits are the share of input tokens recently served from a prompt cache across all requests. They are not a forecast of your own hit rate.

Hourly request success · last 72 hoursLowest hour 78.5%

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": "meituan/longcat-2.5-preview",
    "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="meituan/longcat-2.5-preview",
    messages=[{"role": "user", "content": "Explain this stack trace."}],
)
print(reply.choices[0].message.content)

longcat

Other longcat models, starting with the same family.