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Access 18 ZenMux models through Mastra's model router. Authentication is handled automatically using the ZENMUX_API_KEY environment variable.

Learn more in the ZenMux documentation.

ZENMUX_API_KEY=your-api-key
import { Agent } from "@mastra/core";

const agent = new Agent({
  name: "my-agent",
  instructions: "You are a helpful assistant",
  model: "zenmux/anthropic/claude-haiku-4.5"
});

// 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);
}
info

Mastra uses the OpenAI-compatible /chat/completions endpoint. Some provider-specific features may not be available. Check the ZenMux documentation for details.

Models​

ModelImageAudioVideoToolsStreamingContext Window
zenmux/anthropic/claude-haiku-4.5✓✗✗✓✗200,000
zenmux/anthropic/claude-opus-4.1✓✗✗✓✗200,000
zenmux/anthropic/claude-sonnet-4.5✓✗✗✓✗1,000,000
zenmux/deepseek/deepseek-chat✗✗✗✓✗128,000
zenmux/google/gemini-2.5-pro✓✓✓✓✗1,048,576
zenmux/inclusionai/lint-1t✗✗✗✓✗128,000
zenmux/inclusionai/ring-1t✗✗✗✓✗128,000
zenmux/kuaishou/kat-coder-pro-v1✗✗✗✓✗256,000
zenmux/moonshotai/kimi-k2-0905✗✗✗✓✗262,144
zenmux/openai/gpt-5✓✗✗✓✗400,000
zenmux/openai/gpt-5-codex✓✗✗✓✗400,000
zenmux/qwen/qwen3-coder-plus✗✗✗✓✗1,000,000
zenmux/x-ai/grok-4✓✗✗✓✗256,000
zenmux/x-ai/grok-4-fast✓✗✗✓✗2,000,000
zenmux/x-ai/grok-4-fast-non-reasoning✓✗✗✓✗2,000,000
zenmux/x-ai/grok-code-fast-1✗✗✗✓✗256,000
zenmux/z-ai/glm-4.5-air✗✗✗✓✗128,000
zenmux/z-ai/glm-4.6✗✗✗✓✗200,000

Advanced Configuration​

Custom Headers​

const agent = new Agent({
  name: "custom-agent",
  model: {
    url: "https://zenmux.ai/api/v1",
    id: "zenmux/anthropic/claude-haiku-4.5",
    apiKey: process.env.ZENMUX_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
      ? "zenmux/z-ai/glm-4.6"
      : "zenmux/anthropic/claude-haiku-4.5";
  }
});

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