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, and the launch discount on top of it comes down in steps rather than ending: 90% off through September 10, 2026 (UTC) at $0.03 / $0.006 / $0.12, then 70% off from September 11 to October 10 at $0.09 / $0.018 / $0.36, then list from October 11. Upstage added that middle step after launch, having first published the discount as ending outright on September 11. The tiles below hold the list rate, because it is the one figure in this schedule that is not on a timer.
Run the numbers.
Calculator pre-loaded with Solar Pro 4's LIST rates — what you pay from October 11, 2026. To read the bill you get before then, divide every result by ten through September 10, and by 3.33 from September 11 to October 10. 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 the discount schedule running on top of it.
Q · 01 How much does Solar Pro 4 cost? +
$0.30/M input, $0.06/M cached input and $1.20/M output. The launch discount on top of it runs in two steps: 90% off through September 10, 2026 (UTC), billing $0.03 / $0.006 / $0.12, then 70% off from September 11 to October 10, billing $0.09 / $0.018 / $0.36. List price applies from October 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.