Solar Pro 4 pricing, context and benchmark
Solar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window.
Everything that matters, in one table
Context, pricing, cache, modalities and tooling, from the model registry and Artificial Analysis.
| Model | Solar Pro 4 |
| Model ID | upstage/solar-pro4 |
| Provider | Upstage |
| Release date | 10 August 2026 |
| Status | Generally available |
| Input context | 524,288 tokens |
| Output context | 131,072 tokens |
| Official input pricing | $0.15 per 1M tokens |
| Official output pricing | $0.6 per 1M tokens |
| Cache read pricing | Not published |
| Market input pricing | $0.15 per 1M (cheapest route) |
| Market output pricing | $0.6 per 1M (cheapest route) |
| Input modalities | text |
| Output modalities | text |
| Reasoning control | Not exposed |
| Tool support | Text generation only |
| Tokenizer | Other |
| Provider routes | 2 endpoints |
| Artificial Analysis index | Not published |
| Speed | Not published |
| Knowledge cutoff | Not publicly stated |
Input and output support
| Modality | Input | Output | Billed at |
|---|---|---|---|
| Text | ✓ yes | ✓ yes | $0.15 in |
| Image | no | no | not supported |
| Audio | no | no | not supported |
| Video | no | no | not supported |
| File (PDF) | no | no | not supported |
What is Solar Pro 4?
Solar Pro 4 is Upstage's cost-efficient large language model, featuring a 524K context window.
It is built for long-horizon tasks and agentic workflows, with strong capabilities in office productivity, document-intensive...
Solar Pro 4 carries a 524K token window, uses the Other tokenizer and is served by Upstage. On Hoodgen it sits in the Flagship tier of the model menu next to its siblings, so you can switch mid conversation without losing the thread.
Release and what changed from the previous version
This is the only release of Solar Pro 4 on OpenRouter, released 10 August 2026. The provider has not published a knowledge cutoff, so treat training data as recent but unconfirmed for very new events.
What can you do with Solar Pro 4?
Solar Pro 4 pricing
Official pricing
- 524K context
- text input
- 2 routes on OpenRouter
- What Hoodgen routes to first
- Same model, lower bill
Market pricing, every route
| Provider | Tier | Input | Output | Cache read | Uptime 24h |
|---|---|---|---|---|---|
| Upstage | standard | $0.15 | $0.6 | $0.03 | 100.0% |
| Upstage | standard | $0.15 | $0.6 | $0.03 | 100.0% |
API pricing and cost calculator
| Rate | Per call | Total | Credits |
|---|---|---|---|
| Cheapest route | $0.0025 | $1.23 | 1169 |
| List price | $0.0039 | $1.95 | 1853 |
API and developer information
| Model ID | upstage/solar-pro4 |
| Endpoint | https://openrouter.ai/api/v1/chat/completions |
| Parameters | prompt and max_tokens |
| Streaming | Yes, server sent events |
| Modality string | text->text |
| Max prompt tokens | 524,288 |
| Max completion tokens | 131,072 |
curl https://openrouter.ai/api/v1/chat/completions \
-H "Authorization: Bearer $OPENROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "upstage/solar-pro4",
"messages": [{ "role": "user", "content": "Summarise this document." }],
"max_tokens": 1024
}'Model limitations
| Text only output | It cannot generate images, audio or video. Pair it with an image model on Hoodgen when you need visuals. |
| Output cap | 131,072 tokens per request. Long deliverables have to be chunked. |
| Benchmarks not published | Artificial Analysis does not publish an Intelligence Index for this release, so no benchmark score is claimed here. |
| Knowledge cutoff | The provider does not state a fixed cutoff for every release. Verify very recent events against search. |
Solar Pro 4 vs other Upstage models
| Model | Context | Input /1M | Output /1M | AA index | Released |
|---|---|---|---|---|---|
| Solar Pro 4 | 524K | $0.15 | $0.6 | n/a | 2026 |
| Solar Mini 4 | 524K | $0.05 | $0.2 | n/a | Sep 2026 |
Privacy and data policy
- On Hoodgen, prompts and attachments answer that request and stay in your conversation history so you can reopen it. They are not used to train models.
- Requests route through OpenRouter to Upstage and are covered by that provider's API terms.
- Do not paste secrets or personal data you would not send to any hosted model.
Solar Pro 4 questions, answered
Start chatting with Solar Pro 4
Free to try on Hoodgen AI, with a live credit estimate before every send. No API key, no setup.