# solar-pro3

> solar-pro3 is a proprietary language model from Upstage, released on Jan 2026. It accepts text and generates text, with a 131K-token context window and up to 8K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $0.25 per million input tokens and $0.25 per million output tokens (Upstage Console), across 2 providers we track.

Source page: https://www.aimodel.directory/models/solar-pro3
Last verified: 4 Oct 2026

## Specifications

- **Developer:** Upstage
- **Release date:** Jan 2026 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/upstage/models/solar-pro3.toml)
- **Status:** Generally available (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/upstage/models/solar-pro3.toml)
- **Weights:** Proprietary (API only) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/upstage/models/solar-pro3.toml)
- **Context window:** 131K (131,072 tokens) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/upstage/models/solar-pro3.toml)
- **Max output:** 8K tokens (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/upstage/models/solar-pro3.toml)
- **Knowledge cutoff:** Mar 2025 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/upstage/models/solar-pro3.toml)
- **Input:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/upstage/models/solar-pro3.toml)
- **Output:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/upstage/models/solar-pro3.toml)
- **Reasoning mode:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/upstage/models/solar-pro3.toml)
- **Tool calling:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/upstage/models/solar-pro3.toml)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| OpenRouter | $0.15 | $0.60 | $0.01 | 131K |
| Upstage Console | $0.25 | $0.25 | – | 131K |

## FAQ

### What is the context window of solar-pro3?

solar-pro3 has a context window of 131,072 tokens (131K) and can generate up to 8,192 tokens in a single response, according to models.dev.

### How much does the solar-pro3 API cost?

Through Upstage Console, solar-pro3 costs $0.25 per million input tokens and $0.25 per million output tokens. Prices last verified 4 Oct 2026.

### Is solar-pro3 open source?

No. solar-pro3 is a proprietary model; Upstage has not released its weights. It is available through APIs including OpenRouter, Upstage Console.

### When was solar-pro3 released?

Upstage released solar-pro3 on Jan 2026, according to models.dev.

### Which providers offer solar-pro3?

We track solar-pro3 on 2 providers: OpenRouter, Upstage Console.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "solar-pro3", https://www.aimodel.directory/models/solar-pro3