Anthropic

Get an Anthropic API key

Usage

.env

ANTHROPIC_API_KEY=

import { TokenJS } from 'token.js'

// Create the Token.js client
const tokenjs = new TokenJS()

async function main() {
  // Create a model response
  const completion = await tokenjs.chat.completions.create({
    // Specify the provider and model
    provider: 'anthropic',
    model: 'claude-3-sonnet-20240229',
    // Define your message
    messages: [
      {
        role: 'user',
        content: 'Hello!',
      },
    ],
  })
  console.log(completion.choices[0])
}
main()

Supported Models

Model	Chat Completion	Streaming	JSON Output	Image Input	Function Calling	N > 1
claude-3-7-sonnet-latest	✅	✅	➖	✅	✅	➖
claude-3-7-sonnet-20250219	✅	✅	➖	✅	✅	➖
claude-3-5-sonnet-latest	✅	✅	➖	✅	✅	➖
claude-3-5-sonnet-20240620	✅	✅	➖	✅	✅	➖
claude-3-5-haiku-20241022	✅	✅	➖	➖	✅	➖
claude-3-opus-20240229	✅	✅	➖	✅	✅	➖
claude-3-sonnet-20240229	✅	✅	➖	✅	✅	➖
claude-3-haiku-20240307	✅	✅	➖	✅	✅	➖
claude-2.1	✅	✅	➖	➖	➖	➖
claude-2.0	✅	✅	➖	➖	➖	➖
claude-instant-1.2	✅	✅	➖	➖	➖	➖

Legend

Symbol	Description
✅	Supported by Token.js
➖	Not supported by the LLM provider, so Token.js cannot support it

Additional Resources

• Anthropic Documentation