# Pareto

> Pareto is a proprietary language model from Unbiased, released on 17 Sept 2026. It accepts text and images and generates text, with a 262K-token context window and up to 131K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $2.50 per million input tokens and $7.50 per million output tokens (OpenRouter), across 1 provider we track.

Source page: https://www.aimodel.directory/models/pareto
Last verified: 4 Oct 2026

## Specifications

- **Developer:** Unbiased
- **Release date:** 17 Sept 2026 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openrouter/models/unbiased/pareto.toml)
- **Status:** Generally available (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openrouter/models/unbiased/pareto.toml)
- **Weights:** Proprietary (API only) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openrouter/models/unbiased/pareto.toml)
- **Context window:** 262K (262,144 tokens) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openrouter/models/unbiased/pareto.toml)
- **Max output:** 131K tokens (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openrouter/models/unbiased/pareto.toml)
- **Input:** Text and images (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openrouter/models/unbiased/pareto.toml)
- **Output:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openrouter/models/unbiased/pareto.toml)
- **Reasoning mode:** No (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openrouter/models/unbiased/pareto.toml)
- **Tool calling:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openrouter/models/unbiased/pareto.toml)
- **Structured output:** No (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openrouter/models/unbiased/pareto.toml)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| OpenRouter | $2.50 | $7.50 | $0.25 | 262K |

## FAQ

### What is the context window of Pareto?

Pareto has a context window of 262,144 tokens (262K) and can generate up to 131,072 tokens in a single response, according to models.dev.

### How much does the Pareto API cost?

Pareto is listed from $2.50 per million input tokens and $7.50 per million output tokens (OpenRouter). Prices last verified 4 Oct 2026.

### Is Pareto open source?

No. Pareto is a proprietary model; Unbiased has not released its weights. It is available through APIs including OpenRouter.

### When was Pareto released?

Unbiased released Pareto on 17 Sept 2026, according to models.dev.

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