Claude Opus 4

AnthropicMCP Tool CallReasoning

anthropic/claude-opus-4-20250514Closed API

Flagship Claude model for deep reasoning, coding, and long-horizon agents

Benchmark Pricing$15.00 / 1M in$75.00 / 1M out

Context: 200,000 tokens•Max Output: 32,000 tokens•Knowledge: 2025-03-31•Released: 2025-05-22

TECHNICAL SPECIFICATIONS

Context Window200,000200K tokens

Max Output32,00032K tokens

LicenseProprietaryCloud API only

Input Modalities

TextVisionPDF

Function / Tool CallingSupported (MCP Ready)

Structured OutputsGuaranteed Schema

MODEL CONTEXT PROTOCOL (MCP) READINESS

✓ Claude Opus 4 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 200,000 tokens, this model can handle moderately large MCP tool definitions and multi-turn conversation logs comfortably.

STANDARDIZED BENCHMARKS & EVALS

Aider Polyglotpercent correct

API CALL INVOCATION EXAMPLE

// Example: Calling Claude Opus 4 via OpenAI SDK
import OpenAI from "openai";

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

const response = await client.chat.completions.create({
  model: "anthropic/claude-opus-4-20250514",
  messages: [{ role: "user", content: "Hello! Can you inspect MCP tools?" }],
});

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