Anthropic
Access 19 Anthropic models through Mastra’s model router. Authentication is handled automatically using the ANTHROPIC_API_KEY environment variable.
Learn more in the Anthropic documentation .
ANTHROPIC_API_KEY=your-api-keyimport { Agent } from "@mastra/core";
const agent = new Agent({
name: "my-agent",
instructions: "You are a helpful assistant",
model: "anthropic/claude-3-5-haiku-20241022"
});
// Generate a response
const response = await agent.generate("Hello!");
// Stream a response
const stream = await agent.stream("Tell me a story");
for await (const chunk of stream) {
console.log(chunk);
}Models
| Model | Context | Tools | Reasoning | Image | Audio | Video | Input $/1M | Output $/1M |
|---|---|---|---|---|---|---|---|---|
anthropic/claude-3-5-haiku-20241022 | 200K | $0.80 | $4 | |||||
anthropic/claude-3-5-haiku-latest | 200K | $0.80 | $4 | |||||
anthropic/claude-3-5-sonnet-20240620 | 200K | $3 | $15 | |||||
anthropic/claude-3-5-sonnet-20241022 | 200K | $3 | $15 | |||||
anthropic/claude-3-7-sonnet-20250219 | 200K | $3 | $15 | |||||
anthropic/claude-3-7-sonnet-latest | 200K | $3 | $15 | |||||
anthropic/claude-3-haiku-20240307 | 200K | $0.25 | $1 | |||||
anthropic/claude-3-opus-20240229 | 200K | $15 | $75 | |||||
anthropic/claude-3-sonnet-20240229 | 200K | $3 | $15 | |||||
anthropic/claude-haiku-4-5 | 200K | $1 | $5 | |||||
anthropic/claude-haiku-4-5-20251001 | 200K | $1 | $5 | |||||
anthropic/claude-opus-4-0 | 200K | $15 | $75 | |||||
anthropic/claude-opus-4-1 | 200K | $15 | $75 | |||||
anthropic/claude-opus-4-1-20250805 | 200K | $15 | $75 | |||||
anthropic/claude-opus-4-20250514 | 200K | $15 | $75 | |||||
anthropic/claude-sonnet-4-0 | 200K | $3 | $15 | |||||
anthropic/claude-sonnet-4-20250514 | 200K | $3 | $15 | |||||
anthropic/claude-sonnet-4-5 | 200K | $3 | $15 | |||||
anthropic/claude-sonnet-4-5-20250929 | 200K | $3 | $15 |
Advanced Configuration
Custom Headers
const agent = new Agent({
name: "custom-agent",
model: {
id: "anthropic/claude-3-5-haiku-20241022",
apiKey: process.env.ANTHROPIC_API_KEY,
headers: {
"X-Custom-Header": "value"
}
}
});Dynamic Model Selection
const agent = new Agent({
name: "dynamic-agent",
model: ({ runtimeContext }) => {
const useAdvanced = runtimeContext.task === "complex";
return useAdvanced
? "anthropic/claude-sonnet-4-5-20250929"
: "anthropic/claude-3-5-haiku-20241022";
}
});Provider Options
Anthropic supports the following provider-specific options via the providerOptions parameter:
const response = await agent.generate("Hello!", {
providerOptions: {
anthropic: {
// See available options in the table below
}
}
});Available Options
sendReasoning?:
boolean | undefined
thinking?:
{ type: "enabled" | "disabled"; budgetTokens?: number | undefined; } | undefined
disableParallelToolUse?:
boolean | undefined
cacheControl?:
{ type: "ephemeral"; ttl?: "5m" | "1h" | undefined; } | undefined
container?:
{ id?: string | undefined; skills?: { type: "anthropic" | "custom"; skillId: string; version?: string | undefined; }[] | undefined; } | undefined
Direct Provider Installation
This provider can also be installed directly as a standalone package, which can be used instead of the Mastra model router string. View the package documentation for more details.
npm install @ai-sdk/anthropicFor detailed provider-specific documentation, see the AI SDK Anthropic provider docs .