Linda + Anthropic Claude.

Recommended models

• claude-sonnet-4-6 — the default. Best balance of cost and capability.
• claude-opus-4-7 — pick when you need the very best reasoning.
• claude-haiku-4-5 — pick when you need cheap + fast.

Script tag

<form
  data-linda
  data-linda-provider="anthropic"
  data-linda-model="claude-sonnet-4-6"
  data-linda-key="sk-ant-..."
>
  <input name="email" />
</form>
<script src="https://unpkg.com/@linda/script/dist/linda.js"></script>

npm

import { Linda } from "@linda/core";

const linda = new Linda({
  transport: {
    mode: "browser",
    provider: "anthropic",
    apiKey: import.meta.env.PUBLIC_ANTHROPIC_KEY,
    model: "claude-sonnet-4-6",
  },
});

Proxy (recommended for production)

// server.ts
import { lindaProxy } from "@linda/server";
app.post("/api/linda", lindaProxy({
  provider: "anthropic",
  apiKey: process.env.ANTHROPIC_API_KEY!,
  model: "claude-sonnet-4-6",
}));

// client.ts
const linda = new Linda({
  transport: { mode: "proxy", url: "/api/linda" },
});

Prompt caching

Linda automatically marks the system prompt + skill instructions as cacheable when the Anthropic transport is selected, so repeated calls in the same session hit the prompt cache and cost ~10× less.

Get an API key

From console.anthropic.com. Sonnet 4.6 is $3 / $15 per million tokens (input / output) as of 2026.