Solar Pro 4

by Upstage

Zero data retention−70%
upstage/solar-pro4
Input
$0.13/1M tokens
Output
$0.50/1M tokens
Context
524Ktokens
Max output
131Ktokens
Knows to
-
Released
10 Aug 2026

About

Solar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window.

Pricing

Input$0.13per 1M prompt tokens
Output$0.50per 1M generated tokens, reasoning included
Cached input$0.03per 1M tokens read back from the prompt cache

70% off right now. The provider is running a promotion, and the developer API bills what the provider actually charged for your call plus our flat markup, so it reaches your bill with nothing to claim. The “from” figure is the cheapest endpoint serving the model; which one answers is the provider’s routing decision, so treat it as a floor. Promotions can end at any time.

What a request costs

Typical requestEachPer 1,000
Short chat reply1,500 in · 400 out$0.0004$0.391
Question over a long document40,000 in · 800 out$0.0054$5.44
Agent tool step20,000 in · 1,200 out$0.0031$3.12

At the developer-API rate, before any provider promotion or prompt-cache saving. In the app, the model picker shows what a message costs on your plan before you send it.

Benchmarks

Intelligence28.2#94 of 285
Coding52.7#78 of 163

Head-to-head rankings

  1. #35Web appsAgent arenaElo 109830% wins
  2. #563DModel arenaElo 117946% wins
  3. #63CodeModel arenaElo 118439% wins
  4. #64Game devModel arenaElo 117340% wins
  5. #65Data vizModel arenaElo 117941% wins
  6. #74WebsitesModel arenaElo 117838% wins
  7. #75UI componentsModel arenaElo 114936% wins

Scores from Artificial Analysis; bars are scaled to the best model on our list. Rankings from Design Arena head-to-head votes. Published by OpenRouter alongside its catalogue.

Call it from code

OpenAI-compatible: point any OpenAI SDK at https://api.privateer.pro/v1 and set model. Keys are created in the app under Settings.

cURL
curl https://api.privateer.pro/v1/chat/completions \
  -H "Authorization: Bearer $PRIVATEER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "upstage/solar-pro4",
    "messages": [{ "role": "user", "content": "Hello" }],
    "reasoning": { "effort": "medium" }
  }'
Python
import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.privateer.pro/v1",
    api_key=os.environ["PRIVATEER_API_KEY"],
)
reply = client.chat.completions.create(
    model="upstage/solar-pro4",
    messages=[{"role": "user", "content": "Hello"}],
)
print(reply.choices[0].message.content)
JavaScript
import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.privateer.pro/v1",
  apiKey: process.env.PRIVATEER_API_KEY,
});
const reply = await client.chat.completions.create({
  model: "upstage/solar-pro4",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(reply.choices[0].message.content);

Parameters this model accepts

frequency_penaltyinclude_reasoningmax_tokensparallel_tool_callspresence_penaltyreasoningreasoning_effortresponse_formatstructured_outputstemperaturetool_choicetoolstop_p

API reference → · How API billing works →

Prices are USD at the developer-API rate, as of 16 Oct 2026, rebuilt daily from the providers’ live catalogues. ← All models