How much does Solar Pro4 cost?

Solar Pro4 is billed pay-as-you-go at $0.17 per 1M input tokens and $0.66 per 1M output tokens. There is no subscription — you only pay for what you use.

What can Solar Pro4 do?

Solar Pro4 supports Tool calling.

Is Solar Pro4 free to use?

Solar Pro4 is a paid, pay-as-you-go model — no subscription, you are only charged for usage.

How do I use Solar Pro4 via the API?

Solar Pro4 is OpenAI-compatible. Point any OpenAI SDK at https://api.airforce/v1 and pass the model ID solar-pro4 with your Api.Airforce API key.

Who makes Solar Pro4?

Solar Pro4 is Upstage's chat model, served through the unified Api.Airforce gateway alongside 100+ other models.

UpstagePaidOperational

Solar Pro4

API model name: solar-pro4

Solar Pro4 is Upstage's chat model, served on the Api.Airforce unified API. Capabilities include Tool calling. It is priced at $0.17 per million input tokens and $0.66 per million output tokens. That is below the provider's $0.15 official input rate. Access it through the OpenAI-compatible API with one key, alongside 100+ other models on Api.Airforce.

Get an API key View pricing

Pricing

Input / 1M tokens

$0.17

Output / 1M tokens

$0.66

Cache read / 1M tokens

$0.03

Official input rate

$0.15

Official output rate

$0.60

Api.Airforce price vs. the provider's official rate.

Specifications

Provider: Upstage
Type: chat model

Capabilities

Tool calling

What is Solar Pro4 used for?

Chatbots & assistants — conversational AI, drafting, summarizing and Q&A.
Agents & automation — function calling and tool use for multi-step workflows.

Solar Pro4 vs. similar models

Model	Intelligence	Context	Input / 1M	Output / 1M
Solar Pro4	—	—	$0.17	$0.66
Solar Mini4	—	—	$0.06	$0.22
Solar Pro 3	—	—	$0.17	$0.66
GPT-4	6.7	8K	$3.96	$7.92

Prices are Api.Airforce pay-as-you-go rates per 1M tokens. Context is the maximum input length.

Solar Pro4 — frequently asked questions

How much does Solar Pro4 cost?: Solar Pro4 is billed pay-as-you-go at $0.17 per 1M input tokens and $0.66 per 1M output tokens. There is no subscription — you only pay for what you use.
What can Solar Pro4 do?: Solar Pro4 supports Tool calling.
Is Solar Pro4 free to use?: Solar Pro4 is a paid, pay-as-you-go model — no subscription, you are only charged for usage.
How do I use Solar Pro4 via the API?: Solar Pro4 is OpenAI-compatible. Point any OpenAI SDK at https://api.airforce/v1 and pass the model ID solar-pro4 with your Api.Airforce API key.
Who makes Solar Pro4?: Solar Pro4 is Upstage's chat model, served through the unified Api.Airforce gateway alongside 100+ other models.

All models·Quickstart·Chat API reference

Use Solar Pro4 via the API

OpenAI-compatible — point any OpenAI SDK at https://api.airforce/v1 and pass solar-pro4 as the model.

cURL

curl https://api.airforce/v1/chat/completions \
  -H "Authorization: Bearer $AIRFORCE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "solar-pro4",
    "messages": [{ "role": "user", "content": "Hello!" }]
  }'

Python

from openai import OpenAI
client = OpenAI(base_url="https://api.airforce/v1", api_key="$AIRFORCE_API_KEY")
r = client.chat.completions.create(
    model="solar-pro4",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(r.choices[0].message.content)

JavaScript

import OpenAI from "openai";
const client = new OpenAI({ baseURL: "https://api.airforce/v1", apiKey: process.env.AIRFORCE_API_KEY });
const r = await client.chat.completions.create({
  model: "solar-pro4",
  messages: [{ role: "user", content: "Hello!" }],
});
console.log(r.choices[0].message.content);