LongCat-2.0

MeituanMCP Tool CallReasoning

meituan/longcat-2.0Open Weights

Meituan LongCat-2.0, a reasoning model with tool calling and a 1M-token context window

Benchmark Pricing$0.75 / 1M in$3.00 / 1M out$0.01 cache read

Context: 1,000,000 tokens•Max Output: 131,072 tokens•Released: 2026-06-30

TECHNICAL SPECIFICATIONS

Context Window1,000,0001M tokens

Max Output131,072131.1K tokens

LicenseOpen SourceSelf-hostable

Input Modalities

Text

Function / Tool CallingSupported (MCP Ready)

Structured OutputsGuaranteed Schema

MODEL CONTEXT PROTOCOL (MCP) READINESS

✓ LongCat-2.0 natively supports OpenAI / Anthropic format tool calling and is fully compatible with MCP servers and agent loops.

MCP Context Window Recommendations

With a context capacity of 1,000,000 tokens, this model can handle extremely large MCP resource manifests, complete database schemas, and multiple active server tool definitions simultaneously without degradation.

STANDARDIZED BENCHMARKS & EVALS

SWE-Bench Proresolve rate

59.5

SWE-Bench Multilingualresolve rate

77.3

Terminal-Benchsuccess rate

70.8

GPQA Diamondaccuracy

88.9

BrowseCompaccuracy

79.9

IFEvalaccuracy

FORTEsuccess rate

73.2

API CALL INVOCATION EXAMPLE

// Example: Calling LongCat-2.0 via OpenAI SDK
import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.MEITUAN_API_KEY,
});

const response = await client.chat.completions.create({
  model: "meituan/longcat-2.0",
  messages: [{ role: "user", content: "Hello! Can you inspect MCP tools?" }],
});

console.log(response.choices[0].message.content);