What Solar Mini 4 is
Solar Mini 4 is an Upstage model that went live on OpenRouter on September 23, 2026. It is the first Upstage model of its line in the Whizi catalogue, so there is no earlier version to compare it with.
| Released | September 23, 2026 |
| Provider | Upstage |
| Context window | 524K tokens |
| Input, per million tokens | $0.05 |
| Output, per million tokens | $0.2 |
| Credits per message in Whizi | 1 |
| Minimum Whizi plan | Powerhouse |
How to try Solar Mini 4 in Whizi
Whizi puts Solar Mini 4 in the same model picker as ChatGPT, Claude and Gemini, so there is no separate Upstage account or API key to set up. Pick a plan on the pricing page, open a new chat, choose Solar Mini 4 in the model picker and send your first message.
Each message costs 1 credit, whatever its length. If a question turns out to suit another model better, switch in the same conversation and the thread carries across. See switching models mid-conversation.
What Solar Mini 4 costs
List rates are what the provider charges per token. The cost of one standard answer is the more useful number, because it prices the same unit of work across every model regardless of how each one is billed.
| Input, per million tokens | $0.05 |
| Output, per million tokens | $0.2 |
| One standard answer | $0.0001 |
| One thousand answers | $0.1500 |
| Context window | 524K tokens |
| Credits per message in Whizi | 1 |
| Minimum Whizi plan | Powerhouse |
| Rank by cost, of 113 priced models | 9 |
Prices are the published Upstage rates as carried by OpenRouter, last refreshed 2026-09-26. The full dataset covering all 124 models from 33 providers is the AI model cost index, which is free to reuse with attribution.
What it costs inside Whizi
Whizi meters messages in credits rather than tokens, and Solar Mini 4 is charged at 1 credit per message. The cost does not change with the length of your message or the length of the answer, so a one line question and a long document analysis cost the same.
| Plan | Price per month | Monthly credits | Messages on this model |
|---|---|---|---|
| Powerhouse | $49.99, or $34.99 billed yearly | 8,000 | 8,000 |
Solar Mini 4 is part of the Powerhouse catalogue. Anything not explicitly listed on the Starter or Pro tiers resolves to Powerhouse, which is the deliberate default for the frontier and specialist models. See plans and limits.
- Input $0.05 and output $0.2 per million tokens
- $0.0001 for one standard answer, $0.1500 for a thousand
- 524K token context window
- 1 credit per message inside Whizi
- Requires the Powerhouse plan or above
- Ranks 9 of 113 priced models by cost per answer
Frequently asked questions
What is Solar Mini 4?
Solar Mini 4 is an Upstage model released on September 23, 2026, with a 524K token context window. It is the first Upstage model of its line in the Whizi catalogue, so there is no earlier version to compare it with.
How do I use Solar Mini 4?
Sign up for Whizi, open a new chat and choose Solar Mini 4 in the model picker. It is available on the Powerhouse plan and above at 1 credit per message, with no Upstage account or API key needed.
How much does Solar Mini 4 cost?
$0.05 per million input tokens and $0.2 per million output tokens at list rates, which works out to $0.0001 for one standard answer of 1,000 tokens in and 500 out, or $0.1500 for a thousand of them. Inside Whizi it is 1 credit per message on a monthly allowance, rather than metered per token.
Which Whizi plan includes Solar Mini 4?
Powerhouse and above, which is $49.99 per month or $34.99 billed yearly. At 1 credits per message, a Powerhouse allowance of 8,000 credits covers 8,000 messages on this model if you spend the whole allowance here, and most people mix in a 1 credit model for routine work so it goes further.