// Upstage
Solar Pro 4
A Upstage model. 1 prices across 1 channels side by side, each with its source and check date – plus specs, licence, speed and benchmarks.
- Official in/out per 1M
- —
- Lowest (OpenRouter)
- $0.15 / $0.6
- Context
- 524K
- AA index
- 26.6
Prices checked 2026-10-23Official sources linked on every rowNo estimatesCheapest LLM APIs →
01Specs at a glance
Official values first; gaps filled from OpenRouter’s API where the vendor page is silent.
| Vendor | Upstage |
|---|---|
| Context window | 524K (524,288 tokens) |
| Max output | 131K |
| Input | Text |
| Output | Text |
| Tool calling / JSON | Yes / Yes |
| Weights & licence | Closed · Proprietary (API only) |
| Released | Aug 10, 2026 |
| Model IDs | upstage/solar-pro4 |
02Prices on 1 channels
Per 1M tokens, in the currency each source publishes (1 USD = 6.7 CNY for the blended column). Sorted: official first, then cheapest.
| Channel | Source | Input | Output | Cache hit | Blended $ | Context | Notes |
|---|---|---|---|---|---|---|---|
| OpenRouter Via OpenRouter / provider listed there | OpenRouter Unverified 10-23 | $0.15 | $0.6 | $0.03 | 0.263 | 524K | OpenRouter list price (lowest-routed); official vendor page not verified |
“Official” = vendor pricing page; “Platform” = the platform’s own pricing page; “OpenRouter” = price listed on OpenRouter, not checked on the platform’s site. Click a source tag to open the original page.
03Where you can use it
Derived only from the price sources above. Country restrictions are set by each vendor – check their terms before you sign up.
- Via OpenRouter / provider listed there
OpenRouter
04Performance
Speed and AA index from Artificial Analysis public leaderboards (not our own tests); benchmark scores from our benchmark library, best result per benchmark.
- AA indexSolar Pro 4
- 26.6
- Output speed (median)
- 119 tok/s
- Time to first token
- 1.66s
- AA index per $ (blended)
- 101.18
05Price changes we recorded
All price changes →From our daily re-checks of the sources above.
- 2026-10-20 · OpenRouter · cache read0.018 → 0.03 USD (+66.7%)
- 2026-10-20 · OpenRouter · output0.36 → 0.6 USD (+66.7%)
- 2026-10-20 · OpenRouter · input0.09 → 0.15 USD (+66.7%)
FAQ
How much does the Solar Pro 4 API cost?
There is no official pay-as-you-go price in our data. The lowest listed price is $0.15 / $0.6 on OpenRouter.
What is the context window of Solar Pro 4?
524K tokens of context, up to 131K output tokens. Platforms may cap it lower – see the table.
Is Solar Pro 4 open source?
No. It is only available through APIs and the vendor’s apps.