Abacus

Access 108 Abacus models through Mastra's model router. Authentication is handled automatically using the ABACUS_API_KEY environment variable.

Learn more in the Abacus documentation.

.env

ABACUS_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: "abacus/MiniMaxAI/MiniMax-M2.7"
});

// 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 Abacus documentation for details.

Models

68 available models

Model	Context	Tools	Reasoning	Image	Audio	Video	Input $/1M	Output $/1M
abacus/claude-fable-5	1.0M						$10	$50
abacus/claude-haiku-4-5-20251001	200K						$1	$5
abacus/claude-opus-4-5-20251101	200K						$5	$25
abacus/claude-opus-4-6	1.0M						$5	$25
abacus/claude-opus-4-7	1.0M						$5	$25
abacus/claude-opus-4-8	1.0M						$5	$25
abacus/claude-opus-5	1.0M						$5	$25
abacus/claude-sonnet-4-5-20250929	200K						$3	$15
abacus/claude-sonnet-4-6	1.0M						$3	$15
abacus/claude-sonnet-5	1.0M						$2	$10
abacus/gemini-2.5-flash	1.0M						$0.30	$3
abacus/gemini-2.5-flash-image	33K						$0.30	$30
abacus/gemini-2.5-pro	1.0M						$1	$10
abacus/gemini-3-flash-preview	1.0M						$0.50	$3
abacus/gemini-3-pro-image	66K						$2	$12
abacus/gemini-3.1-flash-lite	1.0M						$0.25	$2
abacus/gemini-3.1-pro-preview	1.0M						$2	$12
abacus/gemini-3.5-flash	1.0M						$2	$9
abacus/gemini-3.5-flash-lite	1.0M						$0.30	$3
abacus/gemini-3.6-flash	1.0M						$0.75	$4
abacus/gemini-3.7-flash	1.0M						$0.75	$4
abacus/google/gemma-4-31b-it	262K						$0.14	$0.40
abacus/gpt-4.1	1.0M						$2	$8
abacus/gpt-4.1-mini	1.0M						$0.40	$2
abacus/gpt-4.1-nano	1.0M						$0.10	$0.40
abacus/gpt-4o	128K						$3	$10
abacus/gpt-4o-mini	128K						$0.15	$0.60
abacus/gpt-5	400K						$1	$10
abacus/gpt-5-mini	400K						$0.25	$2
abacus/gpt-5-nano	400K						$0.05	$0.40
abacus/gpt-5.1	400K						$1	$10
abacus/gpt-5.2	400K						$2	$14
abacus/gpt-5.3-codex	400K						$2	$14
abacus/gpt-5.4	400K						$3	$15
abacus/gpt-5.4-mini	400K						$0.75	$5
abacus/gpt-5.4-nano	400K						$0.20	$1
abacus/gpt-5.5	1.0M						$5	$30
abacus/gpt-5.6-luna	1.0M						$0.20	$1
abacus/gpt-5.6-sol	1.0M						$4	$20
abacus/gpt-5.6-terra	1.0M						$2	$12
abacus/grok-4.3	1.0M						$1	$3
abacus/grok-4.5	500K						$2	$6
abacus/grok-4.6	500K						$2	$6
abacus/mimo-v2-pro	1.0M						$1	$3
abacus/MiniMaxAI/MiniMax-M2.7	205K						$0.30	$1
abacus/MiniMaxAI/MiniMax-M3	1.0M						$0.30	$1
abacus/moonshotai/Kimi-K2.6	262K						$0.95	$4
abacus/moonshotai/Kimi-K2.7-Code	262K						$0.95	$4
abacus/moonshotai/Kimi-K3	1.0M						$3	$15
abacus/muse-spark-1.1	1.0M						$1	$4
abacus/muse-spark-1.2	1.0M						$1	$4
abacus/o3	200K						$2	$8
abacus/o3-mini	200K						$1	$4
abacus/o3-pro	200K						$20	$80
abacus/o4-mini	200K						$1	$4
abacus/openai/gpt-oss-120b	128K						$0.04	$0.17
abacus/Qwen/Qwen3-32B	131K						$0.08	$0.28
abacus/Qwen/Qwen3-Coder-480B-A35B-Instruct	262K						$0.38	$2
abacus/Qwen/Qwen3.6-27B	262K						$0.32	$3
abacus/qwen3.7-max	1.0M						$3	$8
abacus/qwen3.8-max	1.0M						$2	$6
abacus/route-llm	128K						$2	$10
abacus/thinkingmachines/Inkling	262K						$4	$9
abacus/zai-org/GLM-4.6	203K						$0.55	$2
abacus/zai-org/GLM-4.7	205K						$0.60	$2
abacus/zai-org/GLM-5	205K						$1	$3
abacus/zai-org/GLM-5.1	205K						$1	$4
abacus/zai-org/GLM-5.2	1.0M						$1	$4

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://routellm.abacus.ai/v1",
    id: "abacus/MiniMaxAI/MiniMax-M2.7",
    apiKey: process.env.ABACUS_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
      ? "abacus/zai-org/GLM-5.2"
      : "abacus/MiniMaxAI/MiniMax-M2.7";
  }
});