Solar Pro 4

UpstageMCP Tool CallReasoning

upstage/solar-pro4Closed API

Upstage's flagship model, specialized for agentic use

Benchmark Pricing$0.30 / 1M in$1.20 / 1M out$0.06 cache read

Context: 524,288 tokens•Max Output: 131,072 tokens•Knowledge: 2026-02•Released: 2026-08-06

TECHNICAL SPECIFICATIONS

Context Window524,288524.3K tokens

Max Output131,072131.1K tokens

LicenseProprietaryCloud API only

Input Modalities

Text

Function / Tool CallingSupported (MCP Ready)

Structured OutputsGuaranteed Schema

MODEL CONTEXT PROTOCOL (MCP) READINESS

✓ Solar Pro 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 524,288 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 Solar Pro 4 via OpenAI SDK
import OpenAI from "openai";

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

const response = await client.chat.completions.create({
  model: "upstage/solar-pro4",
  messages: [{ role: "user", content: "Hello! Can you inspect MCP tools?" }],
});

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