DeepSeek
Access 2 DeepSeek models through Mastra’s model router. Authentication is handled automatically using the DEEPSEEK_API_KEY environment variable.
Learn more in the DeepSeek documentation .
DEEPSEEK_API_KEY=your-api-keyimport { Agent } from "@mastra/core";
const agent = new Agent({
name: "my-agent",
instructions: "You are a helpful assistant",
model: "deepseek/deepseek-chat"
});
// 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);
}Mastra uses the OpenAI-compatible /chat/completions endpoint. Some provider-specific features may not be available. Check the DeepSeek documentation for details.
Models
| Model | Context | Tools | Reasoning | Image | Audio | Video | Input $/1M | Output $/1M |
|---|---|---|---|---|---|---|---|---|
deepseek/deepseek-chat | 128K | $0.57 | $2 | |||||
deepseek/deepseek-reasoner | 128K | $0.57 | $2 |
Advanced Configuration
Custom Headers
const agent = new Agent({
name: "custom-agent",
model: {
url: "https://api.deepseek.com/chat/completions",
modelId: "deepseek-chat",
apiKey: process.env.DEEPSEEK_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
? "deepseek/deepseek-chat"
: "deepseek/deepseek-reasoner";
}
});