Documentation

1. Paste this into your settings file.

   ~/.claude/settings.json

   {
     "env": {
       "ANTHROPIC_BASE_URL": "https://api.cerberusapp.cc",
       "ANTHROPIC_API_KEY": "PASTE_YOUR_KEY",
       "ANTHROPIC_MODEL": "claude-sonnet-5"
     }
   }

   On Windows the file lives at %USERPROFILE%\.claude\settings.json.

2. Or skip the file and export the variables.

   macOS · LinuxWindows PowerShellWindows CMD

   export ANTHROPIC_BASE_URL="https://api.cerberusapp.cc"
   export ANTHROPIC_API_KEY="PASTE_YOUR_KEY"
   export ANTHROPIC_MODEL="claude-sonnet-5"

3. Start the tool.

   claude

1. Add the provider to your config file.

   ~/.codex/config.toml

   model = "claude-sonnet-5"
   model_provider = "cerbero"
   
   [model_providers.cerbero]
   name = "Cerbero"
   base_url = "https://api.cerberusapp.cc/v1"
   env_key = "CERBERO_API_KEY"
   wire_api = "responses"

2. Export the key under that same name.

   macOS · LinuxWindows PowerShellWindows CMD

   export CERBERO_API_KEY="PASTE_YOUR_KEY"

1. Add the provider to your config file.

   ~/.config/opencode/opencode.json

   {
     "$schema": "https://opencode.ai/config.json",
     "provider": {
       "cerbero": {
         "npm": "@ai-sdk/openai-compatible",
         "name": "Cerbero",
         "options": {
           "baseURL": "https://api.cerberusapp.cc/v1",
           "apiKey": "PASTE_YOUR_KEY"
         },
         "models": {
           "claude-sonnet-5": {}
         }
       }
     }
   }

2. Restart and pick the Cerbero model.

Drop your key in and run it.

curl https://api.cerberusapp.cc/v1/messages \
  -H "x-api-key: PASTE_YOUR_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "content-type: application/json" \
  -d '{"model":"claude-sonnet-5","max_tokens":1024,"messages":[{"role":"user","content":"Write a haiku about the sea"}]}'

Drop your key in and run it.

curl https://api.cerberusapp.cc/v1/chat/completions \
  -H "Authorization: Bearer PASTE_YOUR_KEY" \
  -H "content-type: application/json" \
  -d '{"model":"claude-sonnet-5","messages":[{"role":"user","content":"Write a haiku about the sea"}]}'

Install the SDK and copy the example.

pip install openai

from openai import OpenAI

client = OpenAI(
    api_key="PASTE_YOUR_KEY",
    base_url="https://api.cerberusapp.cc/v1",
)

r = client.chat.completions.create(
    model="claude-sonnet-5",
    messages=[{"role": "user", "content": "Write a haiku about the sea"}],
)
print(r.choices[0].message.content)

Install the SDK and copy the example.

npm install openai

import OpenAI from "openai";

const client = new OpenAI({
  apiKey: "PASTE_YOUR_KEY",
  baseURL: "https://api.cerberusapp.cc/v1",
});

const r = await client.chat.completions.create({
  model: "claude-sonnet-5",
  messages: [{ role: "user", content: "Write a haiku about the sea" }],
});
console.log(r.choices[0].message.content);