Name: Upstage: Solar Pro 4
Author: upstage

Question 1

What is Solar Pro 4?

Accepted Answer

Solar Pro 4 is a large language model from Upstage. It is suited for agentic workflows, office productivity, document-intensive work, and coding.

Question 2

How much does Solar Pro 4 cost?

Accepted Answer

Solar Pro 4 costs $0.03/M input tokens and $0.12/M output tokens, with separate rates for Cache Read at $0.006/M tokens.

Question 3

What is the context length of Solar Pro 4?

Accepted Answer

Solar Pro 4 has a 524,288 token context window. It supports up to 131,072 completion tokens.

Question 4

Does Solar Pro 4 support tool calling and structured outputs?

Accepted Answer

Yes. Solar Pro 4 accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

Question 5

What other text models does Upstage have?

Accepted Answer

Solar Pro 3 is another text model from Upstage.

Question 6

When was Solar Pro 4 released?

Accepted Answer

Solar Pro 4 was released on 2026-08-10.

Upstage: Solar Pro 4

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