GPT-5.6 Terra

OpenAIMCP Tool CallReasoning

openai/gpt-5.6-terraClosed API

Balanced GPT-5.6 model for capable, cost-efficient everyday work

Benchmark Pricing$2.00 / 1M in$12.00 / 1M out$0.20 cache read

Context: 1,050,000 tokens•Max Output: 128,000 tokens•Knowledge: 2026-02-16•Released: 2026-07-09

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-5.6 Terra 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.

STANDARDIZED BENCHMARKS & EVALS

SWE-Bench Proresolve rate

63.4

Terminal-Benchsuccess rate

87.4

DeepSWEresolve rate

69.6

GPQA Diamondaccuracy

92.9

FrontierMathaccuracy

84.9

BrowseCompaccuracy

87.5

OSWorldsuccess rate

50.2

MMMU Proaccuracy

80.7

Agents' Last ExamUnit not reported

50.4

Toolathlonsuccess rate

53.1

Artificial Analysis Intelligence Indexindex score

Artificial Analysis Coding Agent Indexindex score

77.4

API CALL INVOCATION EXAMPLE

// Example: Calling GPT-5.6 Terra 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-5.6-terra",
  messages: [{ role: "user", content: "Hello! Can you inspect MCP tools?" }],
});

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