LongCat 2.0

by meituan · family longcat

Facts

Release date	2026-06-30
Retired date	—
Knowledge cutoff	—
Context (max)	1,048,756
Max output	—
Modalities	text → text
Aliases	`LongCat-2.0`
Open weights	yes (meituan-longcat/LongCat-2.0)
Description	Meituan's 1.6T/48B-active sparse-MoE agentic coding model (MIT); 1M context; thinking toggleable via chat-template commands with thinking_budget.

Unknown values are shown as —.

Offerings

Provider	Wire ID	Endpoint	Protocol	Status	Price (USD / Mtok)	Reasoning
OpenCode Go	`longcat-2.0`	go-chat-completions	openai-chat	ga	—	toggle · default on · returns reasoning_content
OpenCode Zen	`longcat-2.0`	chat-completions	openai-chat	retired	—	toggle · default on · returns reasoning_content
OpenRouter	`meituan/longcat-2.0`	chat-completions	openai-chat	ga	0.30 / 1.20	effort · default on · returns reasoning_content · round-trips reasoning_content

Reasoning controls

OpenCode Go· longcat-2.0· go-chat-completions toggle

thinking_budget on 1024 · off 0

toggle · default on · returns reasoning_content

OpenCode Zen· longcat-2.0· chat-completions toggle

thinking_budget on 1024 · off 0

toggle · default on · returns reasoning_content

OpenRouter· meituan/longcat-2.0· chat-completions effort

reasoning.effort nonelowmedium●highxhighmax

effort · default on · returns reasoning_content · round-trips reasoning_content

Example requests

OpenCode Go · openai-chat · longcat-2.0

curl 'https://opencode.ai/zen/go/v1/chat/completions' \
  -H 'Authorization: Bearer <YOUR_API_KEY>' \
  -H 'Content-Type: application/json' \
  -d '{
  "model": "longcat-2.0",
  "messages": [
    {
      "role": "user",
      "content": "Tell me about the weather."
    }
  ],
  "thinking_budget": "1024"
}'

Python (requests)

import requests

resp = requests.post(
    "https://opencode.ai/zen/go/v1/chat/completions",
    headers={
      "Authorization": "Bearer <YOUR_API_KEY>",
      "Content-Type": "application/json"
    },
    json={
      "model": "longcat-2.0",
      "messages": [
        {
          "role": "user",
          "content": "Tell me about the weather."
        }
      ],
      "thinking_budget": "1024"
    },
)
print(resp.json())

TypeScript (fetch)

const resp = await fetch("https://opencode.ai/zen/go/v1/chat/completions", {
  method: "POST",
  headers: {
    "Authorization": "Bearer <YOUR_API_KEY>",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "model": "longcat-2.0",
    "messages": [
      {
        "role": "user",
        "content": "Tell me about the weather."
      }
    ],
    "thinking_budget": "1024"
  }),
})
console.log(await resp.json())

OpenCode Zen · openai-chat · longcat-2.0

curl 'https://opencode.ai/zen/v1/chat/completions' \
  -H 'Authorization: Bearer <YOUR_API_KEY>' \
  -H 'Content-Type: application/json' \
  -d '{
  "model": "longcat-2.0",
  "messages": [
    {
      "role": "user",
      "content": "Tell me about the weather."
    }
  ],
  "thinking_budget": "1024"
}'

Python (requests)

import requests

resp = requests.post(
    "https://opencode.ai/zen/v1/chat/completions",
    headers={
      "Authorization": "Bearer <YOUR_API_KEY>",
      "Content-Type": "application/json"
    },
    json={
      "model": "longcat-2.0",
      "messages": [
        {
          "role": "user",
          "content": "Tell me about the weather."
        }
      ],
      "thinking_budget": "1024"
    },
)
print(resp.json())

TypeScript (fetch)

const resp = await fetch("https://opencode.ai/zen/v1/chat/completions", {
  method: "POST",
  headers: {
    "Authorization": "Bearer <YOUR_API_KEY>",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "model": "longcat-2.0",
    "messages": [
      {
        "role": "user",
        "content": "Tell me about the weather."
      }
    ],
    "thinking_budget": "1024"
  }),
})
console.log(await resp.json())

OpenRouter · openai-chat · meituan/longcat-2.0

curl 'https://openrouter.ai/api/v1/chat/completions' \
  -H 'Authorization: Bearer <YOUR_API_KEY>' \
  -H 'Content-Type: application/json' \
  -d '{
  "model": "meituan/longcat-2.0",
  "messages": [
    {
      "role": "user",
      "content": "Tell me about the weather."
    }
  ],
  "reasoning": {
    "effort": "medium"
  }
}'

Python (requests)

import requests

resp = requests.post(
    "https://openrouter.ai/api/v1/chat/completions",
    headers={
      "Authorization": "Bearer <YOUR_API_KEY>",
      "Content-Type": "application/json"
    },
    json={
      "model": "meituan/longcat-2.0",
      "messages": [
        {
          "role": "user",
          "content": "Tell me about the weather."
        }
      ],
      "reasoning": {
        "effort": "medium"
      }
    },
)
print(resp.json())

TypeScript (fetch)

const resp = await fetch("https://openrouter.ai/api/v1/chat/completions", {
  method: "POST",
  headers: {
    "Authorization": "Bearer <YOUR_API_KEY>",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "model": "meituan/longcat-2.0",
    "messages": [
      {
        "role": "user",
        "content": "Tell me about the weather."
      }
    ],
    "reasoning": {
      "effort": "medium"
    }
  }),
})
console.log(await resp.json())

⚠ Responses include reasoning_content artifacts — pass them back unmodified on subsequent turns (dropping them triggers 400s or quality loss).