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. The step in effect now is 50% off until further notice — $0.15/M input, $0.03/M cached, $0.60/M output — which started on October 11, 2026, the day Upstage's card had promised list price. Before it came 90% off to September 10 and 70% off from September 11 to October 10; each step was announced as the last. The tiles below hold the list rate, because it is the one figure in this schedule that has never moved.
Run the numbers.
Calculator pre-loaded with Solar Pro 4's LIST rates — what you pay once the discount ends. Upstage currently bills 50% off until further notice, so halve every result for the bill you get today. 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
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 92/8 | 512K | Tool calling and terminal work |
| Solar Mini 4 | $0.10 cache $0.01 | $0.40 | $0.0561 −3.4× · promo | 512K | Same 512K window at a third of the rate |
| Solar Pro 3 | $0.15 cache $0.015 | $0.60 | $0.0842 deprecated · −2.3× | 128K | Previous mid tier, retires Oct 30 |
| GLM-4.7 | $0.60 cache $0.11 | $2.20 | $0.358 +88% | 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 has come down in three steps: 90% off billed $0.03 / $0.006 / $0.12 through September 10, 2026 (UTC), 70% off billed $0.09 / $0.018 / $0.36 through October 10, and since October 11 50% off billing $0.15 / $0.03 / $0.60 until further notice. Upstage publishes no end date for the current step.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? +
solar-pro4-260806, with a 512K context length and a February 2026 training cutoff. We could not find the figure on any first-party page when this model was added on August 16, 2026, and the docs page we checked then no longer exists, so we cannot say whether it was published at the time.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. Rate limits scale with your commitment tier, from 100 requests and 250,000 tokens per minute on Tier 0 to 8,000 and 3M on Enterprise; accounts on Upstage's legacy tiers stay at 100 requests and 50,000 tokens per minute.