LongCat 2.0 API

meituan/longcat-2.0
LongCat 2.0 is Meituan's frontier agentic model with a 1M-token context window, up to 128K output tokens, native tool calling, and deep reasoning mode.
Context
1M tokens
Input
$0.975 / 1M tokens
Output
$3.835 / 1M tokens
Released
Jun 30, 2026

How to use LongCat 2.0 API

Install any OpenAI-compatible SDK, point it at api.aimlapi.com/v1, and set the model to meituan/longcat-2.0.
import requests

r = requests.post(
    "https://api.aimlapi.com/v1/chat/completions",
    headers={"Authorization": "Bearer " + AIMLAPI_KEY},
    json={
      "model": "meituan/longcat-2.0",
      "messages": [
        {
          "role": "user",
          "content": "Hello!"
        }
      ]
    },
)
print(r.json())
const r = await fetch("https://api.aimlapi.com/v1/chat/completions", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.AIMLAPI_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "meituan/longcat-2.0",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ]
  }),
});
console.log(await r.json());
curl -X POST https://api.aimlapi.com/v1/chat/completions \
  -H "Authorization: Bearer $AIMLAPI_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"meituan/longcat-2.0","messages":[{"role":"user","content":"Hello!"}]}'

OpenAI-compatible — swap the base URL and it works with your existing SDK.

LongCat 2.0 API Pricing

TypePrice
Input
$0.975 / 1M tokens
Output
$3.835 / 1M tokens
Cached input
$0.0195 / 1M tokens

LongCat 2.0 Benchmarks

BenchmarkScoreWhat it measuresSourceRetrieved
Intelligence
19.7
Composite score across standardised reasoning, knowledge and problem-solving evaluations, measured independently by Artificial AnalysisSourceSeptember 12, 2026
Coding
45.3
Composite score across standardised coding evaluations, measured independently by Artificial AnalysisSourceSeptember 12, 2026

LongCat 2.0 vs other models

ModelInputOutputContextBest for
LongCat 2.0
This page
$0.975 / 1M tokens
$3.835 / 1M tokens
1M tokens
Reasoning + agents
$6.5 / 1M tokens
$39 / 1M tokens
1M tokens
Reasoning + agents
$2.6 / 1M tokens
$13 / 1M tokens
1M tokens
Balanced coding + agents
$3.9 / 1M tokens
$19.5 / 1M tokens
1M tokens
Long-context, multimodal & agentic workflows
$0.65 / 1M tokens
$3.9 / 1M tokens
1M tokens
Reasoning + agents

Frequently asked questions

LongCat 2.0 has a 1,000,000 tokens context window and can return up to 128,000 tokens.

LongCat 2.0 takes text as input and returns text.

Use meituan/longcat-2.0 as the model id. Requests go to https://api.aimlapi.com/v1/chat/completions.

LongCat 2.0 is priced at input $0.975 / 1M tokens, output $3.835 / 1M tokens, cached input $0.0195 / 1M tokens.

Yes, LongCat 2.0 can stream responses as they are generated.

LongCat 2.0 was built by Meituan.

Start building with LongCat 2.0

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