GPT-5.6 Sol

OpenAIMCP Tool CallReasoning

openai/gpt-5.6-solClosed API

Frontier GPT-5.6 model for complex professional work, coding, and agentic workflows

Benchmark Pricing$4.00 / 1M in$20.00 / 1M out$0.40 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 Sol 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

64.6

Terminal-Benchsuccess rate

88.8

DeepSWEresolve rate

72.7

GPQA Diamondaccuracy

94.6

FrontierMathaccuracy

BrowseCompaccuracy

90.4

OSWorldsuccess rate

62.6

MMMU Proaccuracy

Agents' Last ExamUnit not reported

52.7

Toolathlonsuccess rate

Artificial Analysis Intelligence Indexindex score

58.9

Artificial Analysis Coding Agent Indexindex score

API CALL INVOCATION EXAMPLE

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

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