Pioneer

Access 25 Pioneer models through Mastra's model router. Authentication is handled automatically using the PIONEER_API_KEY environment variable.

Learn more in the Pioneer documentation.

.env

PIONEER_API_KEY=your-api-key

src/mastra/agents/my-agent.ts

import { Agent } from "@mastra/core/agent";

const agent = new Agent({
  id: "my-agent",
  name: "My Agent",
  instructions: "You are a helpful assistant",
  model: "pioneer/claude-fable-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);
}

note

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

Models

12 available models

Model	Context	Tools	Reasoning	Image	Audio	Video	Input $/1M	Output $/1M
pioneer/fastino/gliguard-LLMGuardrails-300M	8K						$0.15	$0.15
pioneer/fastino/gliguard-PII-multi	8K						$0.15	$0.15
pioneer/fastino/GLiNER-2.5-Decide	8K						$0.03	—
pioneer/fastino/gliner2-base-v1	2K						$0.03	—
pioneer/fastino/gliner2-large-v1	8K						$0.03	—
pioneer/fastino/gliner2-multi-large-v1	8K						$0.03	—
pioneer/fastino/gliner2-multi-v1	8K						$0.03	—
pioneer/fastino/gliner2-privacy-filter-PII-multi	8K						$0.03	—
pioneer/fastino/gliner2.5-base-v1	4K						$0.03	—
pioneer/fastino/gliner2.5-multi-v1	4K						$0.03	—
pioneer/nvidia/NVIDIA-Nemotron-3.5-Lightning-30B-A3B-BF16	66K						$0.07	$0.20
pioneer/nvidia/NVIDIA-Nemotron-3.5-Super-VL-120B-A12B-NVFP4	262K						$0.08	$0.45

Model availability, capabilities, context windows, and pricing are sourced from models.dev and may change.

Advanced configuration

Custom headers

src/mastra/agents/my-agent.ts

const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    url: "https://api.fastino.ai/v1",
    id: "pioneer/claude-fable-5",
    apiKey: process.env.PIONEER_API_KEY,
    headers: {
      "X-Custom-Header": "value"
    }
  }
});

Dynamic model selection

src/mastra/agents/my-agent.ts

const agent = new Agent({
  id: "dynamic-agent",
  name: "Dynamic Agent",
  model: ({ requestContext }) => {
    const useAdvanced = requestContext.task === "complex";
    return useAdvanced
      ? "pioneer/zai-org/GLM-5.2"
      : "pioneer/claude-fable-5";
  }
});