Solar Pro 4
About this model
Solar Pro 4 is an AI model from Upstage, made available through the API on August 10, 2026. It can read up to 524,288 tokens in one request, roughly 983 pages of text, and write up to 131,072 tokens in a single answer.
Through the API it costs $0.09 per million input tokens and $0.36 per million output tokens. Its pricing puts it among the more affordable models we track, which makes it a good fit for high-volume tasks.
It supports extended reasoning: it can "think" step by step before answering, which helps on maths, code and complex questions. It can call tools and functions, so developers can connect it to search, databases or other software.
Quality scores
Rankings →Not rated yet. Independent test results usually appear a few weeks after a model is released.
Where to use it
Companies that serve this model through an API: 2. Prices per million tokens, cheapest first.
| Provider | Inputi | Outputi | Contexti | Uptime (24 h)i |
|---|---|---|---|---|
UpstageOfficial | $0.09 | $0.36 | 512K | 99.8% |
UpstageOfficial | $0.09 | $0.36 | 512K | 99.8% |
Availability and prices come from OpenRouter’s public API and are refreshed daily. Uptime is the share of successful requests over the last 24 hours. Some providers run a compressed version of open models (fp8, int4), which is cheaper but can be slightly less accurate.
Use it in your code
Call Solar Pro 4 through OpenRouter’s OpenAI-compatible API: create a key on openrouter.ai, then run one of these examples.
curl https://openrouter.ai/api/v1/chat/completions \
-H "Authorization: Bearer $OPENROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model": "upstage/solar-pro4", "messages": [{"role": "user", "content": "Hello! What can you do?"}]}'import os
from openai import OpenAI
client = OpenAI(base_url="https://openrouter.ai/api/v1", api_key=os.environ["OPENROUTER_API_KEY"])
reply = client.chat.completions.create(
model="upstage/solar-pro4",
messages=[{"role": "user", "content": "Hello! What can you do?"}],
)
print(reply.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({ baseURL: "https://openrouter.ai/api/v1", apiKey: process.env.OPENROUTER_API_KEY });
const reply = await client.chat.completions.create({
model: "upstage/solar-pro4",
messages: [{ role: "user", content: "Hello! What can you do?" }],
});
console.log(reply.choices[0].message.content);The same code works with every model on this site: only the model ID changes. Many labs also offer their own API and SDK.
What it costs in practice
- 1,000 chat replies$0.153
- Summarise a 100-page document$0.0049
- An app with 10,000 requests a day for a month$70.20
Similar-priced alternatives
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|---|---|---|---|---|
GPT-6 Luna ProOpenAI | $0.10 | $0.50 | 1.1M | Compare with ⇄ |
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Ternary Bonsai 2 27BPrism Ml | $0.075 | $0.50 | 256K | Compare with ⇄ |
Nex-N2.5-ProNex Agi | $0.075 | $0.25 | 256K | Compare with ⇄ |
Hy-MT2-30B-A3BTencent | $0.074 | $0.30 | 8K | Compare with ⇄ |
Laguna S 2.1Poolside | $0.09 | $0.18 | 1M | Compare with ⇄ |
Frequently asked questions
- How much does Solar Pro 4 cost?
- Solar Pro 4 costs $0.09 per million input tokens and $0.36 per million output tokens through the API. For example, 1,000 chat replies of about 500 tokens in and 300 out cost around $0.153.
- What is the context window of Solar Pro 4?
- Solar Pro 4 can read up to 524,288 tokens in one request, about 983 pages of text. It can write up to 131,072 tokens in a single answer.
- Is Solar Pro 4 open source?
- No. Solar Pro 4 is a closed model: its weights are not published, so you use it through Upstage’s own apps and API, or through cloud providers.
- Who makes Solar Pro 4?
- Solar Pro 4 is made by Upstage. It became available through the API on August 10, 2026.
- Can Solar Pro 4 read images?
- No. Solar Pro 4 only accepts text as input.
- What are the alternatives to Solar Pro 4?
- Models with a similar price from other companies include GPT-6 Luna Pro, Muse Spark 1.3 Contributor and Ternary Bonsai 2 27B. You can compare them side by side on this page.