Upstage: solar-pro3
solar-pro3 is a reasoning model from Upstage released on Jan 1, 2026. It reads text and writes text, with a 131K token context window and up to 8K tokens per reply.
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It costs $0.25 per million input tokens and $0.25 per million output tokens.
It supports tool calling and structured JSON output.
5 providers serve it, including Kilo Gateway, LLMTR and NanoGPT. The lowest input price is $0.15 per million tokens at Kilo Gateway.
- Modalities
- In / out price
- $0.25 / $0.25 per 1M
- Context
- 131K
- Max output
- 8K
- Released
- Jan 1, 2026
- Knowledge cutoff
- Mar 2025
- Tool calling
- Structured output
- Reasoning
- Prompt caching
- Open weights
- Free to use
solar-pro3 pricing
USD, as listed on Oct 15, 2026. Most bills are input heavy, so the cached input rate matters as much as the headline price.
| Input | $0.25 / 1M tokens | |
|---|---|---|
| Output | $0.25 / 1M tokens |
solar-pro3 providers
5 providers serve it, including Kilo Gateway, LLMTR and NanoGPT. The lowest input price is $0.15 per million tokens at Kilo Gateway. Each host sets its own price and limits, so the cheapest one is not always the one with the longest context.
| Provider | Input /M | Output /M | Cache read /M | Context | Max output |
|---|---|---|---|---|---|
| Upstage First party | $0.25 | $0.25 | – | 131K | 8K |
| Kilo Gateway | $0.15 | $0.60 | $0.015 | 131K | 118K |
| LLMTR | $0.15 | $0.60 | – | 131K | 8K |
| NanoGPT | $0.15 | $0.60 | $0.015 | 131K | 118K |
| AI/ML API | $0.2063 | $0.8252 | $0.0206 | 128K | 8K |
What solar-pro3 costs per month
Pick a workload close to yours or type your own volumes.
Supported request parameters
What you can set when you call solar-pro3 through an OpenAI compatible API.
- Tools
tools - Structured outputs
structured_outputs - Reasoning
reasoning - Temperature
temperature
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solar-pro3 questions
How much does the solar-pro3 API cost?
$0.25 per million input tokens and $0.25 per million output tokens. The estimator on this page turns that into a monthly bill for your own workload.
What is the context window of solar-pro3?
131,072 tokens of input, and it can write up to 8,192 tokens in one reply. As a rough guide, a million tokens is around 750,000 English words.
Which providers serve solar-pro3?
5 providers serve it, including Kilo Gateway, LLMTR and NanoGPT. The lowest input price is $0.15 per million tokens at Kilo Gateway. Prices differ by host, so the Providers table on this page lists each one with its input and output price.
Does solar-pro3 support tool calling?
Yes. It accepts tool definitions and can return JSON that matches a schema, which is what an agent needs to call your APIs.
Is solar-pro3 open source?
No. Upstage serves it through an API only, so you cannot download the weights or host it yourself.
When was solar-pro3 released?
Jan 1, 2026, with training data up to Mar 2025.
Catalog data from models.dev (MIT licensed), refreshed daily, last on Oct 15, 2026. The summary is written from these facts.