Aion-2.0

Aion-labsMCP Tool CallReasoning

aion-labs/aion-2.0Closed API

Reasoning model for deliberate analysis, multi-step problem solving, and tool use

Benchmark Pricing$0.80 / 1M in$1.60 / 1M out$0.20 cache read

Context: 131,072 tokens•Max Output: 32,768 tokens•Released: 2025-12-21

TECHNICAL SPECIFICATIONS

Context Window131,072131.1K tokens

Max Output32,76832.8K tokens

LicenseProprietaryCloud API only

Input Modalities

Text

Function / Tool CallingSupported (MCP Ready)

Structured OutputsGuaranteed Schema

MODEL CONTEXT PROTOCOL (MCP) READINESS

✓ Aion-2.0 natively supports OpenAI / Anthropic format tool calling and is fully compatible with MCP servers and agent loops.

MCP Context Window Recommendations

With a context capacity of 131,072 tokens, this model can handle moderately large MCP tool definitions and multi-turn conversation logs comfortably.

API CALL INVOCATION EXAMPLE

// Example: Calling Aion-2.0 via OpenAI SDK
import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.AION-LABS_API_KEY,
});

const response = await client.chat.completions.create({
  model: "aion-labs/aion-2.0",
  messages: [{ role: "user", content: "Hello! Can you inspect MCP tools?" }],
});

console.log(response.choices[0].message.content);