Anthropic
Use Anthropic's Claude models through the OpenAI SDK surface. Supercompat routes every call through
/chat/completions using completionsRunAdapter, so function tools, streaming, and the Responses API work with anthropic-sdk as the backend.Install
npm install supercompat openai @anthropic-ai/sdk
Minimal setup
import Anthropic from '@anthropic-ai/sdk'
import {
supercompat,
anthropicClientAdapter,
completionsRunAdapter,
memoryStorageAdapter,
} from 'supercompat/openai'
const anthropic = new Anthropic({ apiKey: process.env.ANTHROPIC_API_KEY })
const client = supercompat({
clientAdapter: anthropicClientAdapter({ anthropic }),
storageAdapter: memoryStorageAdapter(),
runAdapter: completionsRunAdapter(),
})
const response = await client.responses.create({
model: 'claude-sonnet-4-6',
input: 'Explain quantum computing in one sentence.',
})
Tool use
Function tools are declared with the OpenAI shape:
const response = await client.responses.create({
model: 'claude-sonnet-4-6',
input: 'What is the weather in Paris?',
tools: [
{
type: 'function',
name: 'get_weather',
description: 'Return the current weather in a city.',
parameters: {
type: 'object',
properties: { city: { type: 'string' } },
required: ['city'],
},
},
],
})
Anthropic tool_use blocks come back as
function_call items on the OpenAI side. See Tools for the full round-trip.Streaming
const stream = await client.responses.create({
model: 'claude-sonnet-4-6',
input: 'Count to three.',
stream: true,
})
for await (const event of stream) {
if (event.type === 'response.output_text.delta') {
process.stdout.write(event.delta)
}
}
Models
Pass any Claude model id — the full catalog is at docs.anthropic.com/en/docs/about-claude/models/overview.
Some current examples:
claude-sonnet-4-6claude-opus-4-6claude-haiku-4-5