Tempr

Access 29 Tempr models through Mastra's model router. Authentication is handled automatically using the TEMPR_API_KEY environment variable.

Learn more in the Tempr documentation.

.env

TEMPR_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: "tempr/anthropic/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 Tempr documentation for details.

Models

29 available models

Model	Context	Tools	Reasoning	Image	Audio	Video	Input $/1M	Output $/1M
tempr/anthropic/claude-fable-5	1.0M						$10	$50
tempr/anthropic/claude-fable-5-1	1.0M						$10	$50
tempr/anthropic/claude-haiku-4-5	200K						$1	$5
tempr/anthropic/claude-haiku-4-5-20251001	200K						$1	$5
tempr/anthropic/claude-opus-4-5	200K						$5	$25
tempr/anthropic/claude-opus-4-5-20251101	200K						$5	$25
tempr/anthropic/claude-opus-4-6	1.0M						$5	$25
tempr/anthropic/claude-opus-4-7	1.0M						$5	$25
tempr/anthropic/claude-opus-4-8	1.0M						$5	$25
tempr/anthropic/claude-opus-5	1.0M						$5	$25
tempr/anthropic/claude-sonnet-4-5	200K						$3	$15
tempr/anthropic/claude-sonnet-4-5-20250929	200K						$3	$15
tempr/anthropic/claude-sonnet-4-6	1.0M						$3	$15
tempr/anthropic/claude-sonnet-5	1.0M						$2	$10
tempr/google/gemini-3-flash-preview	1.0M						$0.50	$3
tempr/google/gemini-3.1-flash-lite	1.0M						$0.25	$2
tempr/google/gemini-3.1-pro-preview	1.0M						$2	$12
tempr/google/gemini-3.1-pro-preview-customtools	1.0M						$2	$12
tempr/google/gemini-3.5-flash	1.0M						$2	$9
tempr/google/gemini-3.5-flash-lite	1.0M						$0.30	$3
tempr/google/gemini-3.6-flash	1.0M						$0.75	$4
tempr/google/gemini-3.7-flash	1.0M						$0.75	$4
tempr/google/gemini-3.8-flash	1.0M						$0.75	$4
tempr/google/gemini-embedding-001	2K						$0.15	—
tempr/google/gemini-embedding-2	8K						$0.20	—
tempr/google/gemini-flash-latest	1.0M						$0.75	$4
tempr/google/gemini-flash-lite-latest	1.0M						$0.30	$3
tempr/google/gemma-4-26b-a4b-it	262K						—	—
tempr/google/gemma-4-31b-it	262K						—	—

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.temprhq.io/v1",
    id: "tempr/anthropic/claude-fable-5",
    apiKey: process.env.TEMPR_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
      ? "tempr/google/gemma-4-31b-it"
      : "tempr/anthropic/claude-fable-5";
  }
});