OpenCode Go

Access 33 OpenCode Go models through Mastra's model router. Authentication is handled automatically using the OPENCODE_API_KEY environment variable.

Learn more in the OpenCode Go documentation.

.env

OPENCODE_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: "opencode-go/beam-free"
});

// 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);
}

备注

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

Models

29 available models

Model	Context	Tools	Reasoning	Image	Audio	Video	Input $/1M	Output $/1M
opencode-go/beam-free	1.0M						—	—
opencode-go/claude-haiku-5-5	1.0M						$0.10	$0.50
opencode-go/deepseek-v4-pro	1.0M						$0.66	$2
opencode-go/deepseek-v4.1-flash	1.0M						$0.15	$0.60
opencode-go/gemini-4-argon-contributor	1.0M						$4	$20
opencode-go/glm-5.2	1.0M						$1	$4
opencode-go/glm-5.3	1.0M						$1	$4
opencode-go/glm-5.3-flash	1.0M						$0.15	$0.50
opencode-go/gpt-5.6-luna	1.1M						$0.20	$1
opencode-go/gpt-6-luna	1.1M						$0.10	$0.50
opencode-go/grok-4.7	500K						$2	$6
opencode-go/hy3	256K						$0.14	$0.58
opencode-go/hy4-preview	1.0M						$0.83	$3
opencode-go/kimi-k2.7-code	262K						$0.95	$4
opencode-go/kimi-k3	1.0M						$3	$15
opencode-go/longcat-2.0	1.0M						$0.30	$1
opencode-go/longcat-2.5-preview-free	1.0M						—	—
opencode-go/mimo-v2.5	1.0M						$0.14	$0.28
opencode-go/mimo-v2.5-pro	1.0M						$0.43	$0.87
opencode-go/mimo-v2.6-flash	1.0M						$0.14	$0.28
opencode-go/mimo-v2.6-pro	1.0M						$0.43	$0.87
opencode-go/minimax-m3	1.0M						$0.30	$1
opencode-go/minimax-m3.1-flash-free	1.0M						—	—
opencode-go/muse-spark-1.2-contributor	1.0M						$0.10	$0.20
opencode-go/muse-spark-1.3-contributor	1.0M						$0.10	$0.20
opencode-go/qwen3.7-plus	1.0M						$0.40	$2
opencode-go/qwen3.8-flash	1.0M						$0.15	$0.47
opencode-go/qwen3.8-max	1.0M						$2	$6
opencode-go/step-5-preview	1.0M						$1	$3

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://opencode.ai/inference/go/openai/v1",
    id: "opencode-go/beam-free",
    apiKey: process.env.OPENCODE_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
      ? "opencode-go/step-5-preview-free"
      : "opencode-go/beam-free";
  }
});