GPT-6 Astra (Fast)

OpenAIMCP Tool CallReasoning

openai/gpt-6-astra-fastClosed API

Fast variant of GPT-6 Astra for low-latency assistance and high-volume workloads.

Benchmark Pricing$20.00 / 1M in$100.00 / 1M out$2.00 cache read

Context: 1,050,000 tokens•Max Output: 128,000 tokens•Released: 2026-09-04

TECHNICAL SPECIFICATIONS

Context Window1,050,0001.1M tokens

Max Output128,000128K tokens

LicenseProprietaryCloud API only

Input Modalities

TextVisionPDF

Function / Tool CallingSupported (MCP Ready)

Structured OutputsGuaranteed Schema

MODEL CONTEXT PROTOCOL (MCP) READINESS

✓ GPT-6 Astra (Fast) 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 1,050,000 tokens, this model can handle extremely large MCP resource manifests, complete database schemas, and multiple active server tool definitions simultaneously without degradation.

API CALL INVOCATION EXAMPLE

// Example: Calling GPT-6 Astra (Fast) via OpenAI SDK
import OpenAI from "openai";

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

const response = await client.chat.completions.create({
  model: "openai/gpt-6-astra-fast",
  messages: [{ role: "user", content: "Hello! Can you inspect MCP tools?" }],
});

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