Neon

Access 25 Neon models through Mastra's model router. Authentication is handled automatically using the NEON_AI_GATEWAY_TOKEN environment variable. Configure NEON_AI_GATEWAY_BASE_URL as well.

Learn more in the Neon documentation.

.env

NEON_AI_GATEWAY_BASE_URL=your-value
NEON_AI_GATEWAY_TOKEN=your-api-token

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: "neon/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 Neon documentation for details.

Models

25 available models

Model	Context	Tools	Reasoning	Image	Audio	Video	Input $/1M	Output $/1M
neon/claude-haiku-4-5	200K						$1	$5
neon/claude-opus-4-1	200K						$15	$75
neon/claude-opus-4-5	200K						$5	$25
neon/claude-opus-4-6	1.0M						$5	$25
neon/claude-opus-4-7	1.0M						$5	$25
neon/claude-sonnet-4	200K						$3	$15
neon/claude-sonnet-4-5	200K						$3	$15
neon/claude-sonnet-4-6	1.0M						$3	$15
neon/gemini-2-5-flash	1.0M						$0.30	$3
neon/gemini-2-5-pro	1.0M						$1	$10
neon/gemini-3-1-flash-lite	1.0M						$0.25	$2
neon/gemini-3-1-pro	1.0M						$2	$12
neon/gemini-3-flash	1.0M						$0.50	$3
neon/gemini-3-pro	1.0M						$2	$12
neon/gpt-5	400K						$1	$10
neon/gpt-5-1	400K						$1	$10
neon/gpt-5-2	400K						$2	$14
neon/gpt-5-4	1.1M						$3	$15
neon/gpt-5-4-mini	400K						$0.75	$5
neon/gpt-5-4-nano	400K						$0.20	$1
neon/gpt-5-5	1.1M						$5	$30
neon/gpt-5-mini	400K						$0.25	$2
neon/gpt-5-nano	400K						$0.05	$0.40
neon/gpt-oss-120b	131K						$0.07	$0.28
neon/gpt-oss-20b	131K						$0.05	$0.20

Advanced configuration

Custom headers

src/mastra/agents/my-agent.ts

const agent = new Agent({
  id: "custom-agent",
  name: "custom-agent",
  model: {
    url: "${NEON_AI_GATEWAY_BASE_URL}/ai-gateway/mlflow/v1",
    id: "neon/claude-haiku-4-5",
    apiKey: process.env.NEON_AI_GATEWAY_TOKEN,
    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
      ? "neon/gpt-oss-20b"
      : "neon/claude-haiku-4-5";
  }
});