Solar Pro 4 API Pricing
Solar Pro 4 is Upstage's agentic flagship, built for tool calling, terminal tasks and long-document reasoning. The list price is $0.30/M input, $0.06/M cached input and $1.20/M output — but Upstage is running 90% off until September 10, 2026 (UTC), so today you are charged $0.03 / $0.006 / $0.12, with standard pricing resuming September 11. We store the list rate, because that is what you will pay once the discount lapses; size your budget on the figures in the tiles, not the ones on your invoice this month.
Run the numbers.
Calculator pre-loaded with Solar Pro 4's LIST rates — what you pay from September 11, 2026. While the launch discount runs, divide every result by ten. Solar Pro 4 reasons by default and its reasoning tokens are billed as output, so a task that thinks hard costs more than its visible answer suggests.
Real-world presets.
Repo implementation
Pull request review
Knowledge base answer
Support assistant
Paste text. See tokens. See cost.
This is a chars-per-token approximation, not a real tokenizer. Actual tokens vary by language, code density, and tool-call overhead — counts are typically ±10–20% off for English prose, more for code or non-Latin scripts. For exact billing, use the vendor's official tokenizer.
| Model | Input /M | Output /M | Effective blended | Context | Best for |
|---|---|---|---|---|---|
| Solar Pro 4 Current | $0.30 cache $0.06 | $1.20 | $0.191 agentic flagship | Not published | Tool calling and terminal work |
| Solar Pro 3 | $0.15 cache $0.015 | $0.60 | $0.0842 half the flagship rate | Not published | Reasoning and instruction following |
| Solar Pro 2 | $0.15 cache $0.015 | $0.60 | $0.0842 same card as Pro 3 | Not published | Enterprise reasoning, prior gen |
| GLM-4.7 | $0.60 cache $0.11 | $2.20 | $0.358 Zhipu coding tier | 200K | Comparable Chinese coding model |
Frequently asked.
Solar Pro 4 pricing questions, with the list price kept apart from what the discount charges today.
Q · 01 How much does Solar Pro 4 cost? +
$0.30/M input, $0.06/M cached input and $1.20/M output. Upstage is running a launch discount of 90% until September 10, 2026 (UTC), so the rate charged today is $0.03 / $0.006 / $0.12. Standard pricing applies from September 11.Q · 02 Why do you show the higher price? +
Q · 03 Are reasoning tokens billed separately? +
usage.completion_tokens, which means they bill at the output rate. Check usage.completion_tokens_details.reasoning_tokens to see how much of a bill is thinking rather than answer.Q · 04 What context window does it have? +
Q · 05 Is the API hard to migrate to? +
https://api.upstage.ai/v1 and pass solar-pro4 as the model. The alias currently resolves to the dated build solar-pro4-260806. Published rate limits are 100 requests/min and 50,000 tokens/min.