# solar-pro2

> solar-pro2 is a proprietary language model from Upstage, released on 20 May 2025. It accepts text and generates text, with a 66K-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 1 provider we track.

Source page: https://www.aimodel.directory/models/solar-pro2
Last verified: 4 Oct 2026

## Specifications

- **Developer:** Upstage
- **Release date:** 20 May 2025 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/upstage/models/solar-pro2.toml)
- **Status:** Generally available (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/upstage/models/solar-pro2.toml)
- **Weights:** Proprietary (API only) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/upstage/models/solar-pro2.toml)
- **Context window:** 66K (65,536 tokens) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/upstage/models/solar-pro2.toml)
- **Max output:** 8K tokens (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/upstage/models/solar-pro2.toml)
- **Knowledge cutoff:** Mar 2025 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/upstage/models/solar-pro2.toml)
- **Input:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/upstage/models/solar-pro2.toml)
- **Output:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/upstage/models/solar-pro2.toml)
- **Reasoning mode:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/upstage/models/solar-pro2.toml)
- **Tool calling:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/upstage/models/solar-pro2.toml)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| Upstage Console | $0.25 | $0.25 | – | 66K |

## FAQ

### What is the context window of solar-pro2?

solar-pro2 has a context window of 65,536 tokens (66K) and can generate up to 8,192 tokens in a single response, according to models.dev.

### How much does the solar-pro2 API cost?

Through Upstage Console, solar-pro2 costs $0.25 per million input tokens and $0.25 per million output tokens. Prices last verified 4 Oct 2026.

### Is solar-pro2 open source?

No. solar-pro2 is a proprietary model; Upstage has not released its weights. It is available through APIs including Upstage Console.

### When was solar-pro2 released?

Upstage released solar-pro2 on 20 May 2025, according to models.dev.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "solar-pro2", https://www.aimodel.directory/models/solar-pro2