Grok 4.3

xAIMCP Tool CallReasoning

xai/grok-4.3Closed API

xAI's default Grok for chat, coding, agentic tools, and lower hallucination risk

Benchmark Pricing$1.25 / 1M in$2.50 / 1M out$0.20 cache read

Context: 1,000,000 tokens•Max Output: 30,000 tokens•Released: 2026-04-17

TECHNICAL SPECIFICATIONS

Context Window1,000,0001M tokens

Max Output30,00030K tokens

LicenseProprietaryCloud API only

Input Modalities

TextVisionPDF

Function / Tool CallingSupported (MCP Ready)

Structured OutputsGuaranteed Schema

MODEL CONTEXT PROTOCOL (MCP) READINESS

✓ Grok 4.3 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 1,000,000 tokens, this model can handle extremely large MCP resource manifests, complete database schemas, and multiple active server tool definitions simultaneously without degradation.

STANDARDIZED BENCHMARKS & EVALS

Artificial Analysis Intelligence Indexindex score

GDPval-AAElo

1500

τ²-Bench Telecomsuccess rate

IFBenchaccuracy

API CALL INVOCATION EXAMPLE

// Example: Calling Grok 4.3 via OpenAI SDK
import OpenAI from "openai";

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

const response = await client.chat.completions.create({
  model: "xai/grok-4.3",
  messages: [{ role: "user", content: "Hello! Can you inspect MCP tools?" }],
});

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