# Mercury 2.5

> Mercury 2.5 is a proprietary language model from Inception Labs, released on 8 Sept 2026. It accepts text and generates text, with a 260K-token context window and up to 66K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $0.04 per million input tokens and $0.15 per million output tokens (Inception API), across 2 providers we track.

Source page: https://www.aimodel.directory/models/mercury-2-5
Last verified: 4 Oct 2026

## Specifications

- **Developer:** Inception Labs
- **Release date:** 8 Sept 2026 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/inception/models/mercury-2.5.toml)
- **Status:** Generally available (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/inception/models/mercury-2.5.toml)
- **Weights:** Proprietary (API only) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/inception/models/mercury-2.5.toml)
- **Context window:** 260K (260,000 tokens) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/inception/models/mercury-2.5.toml)
- **Max output:** 66K tokens (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/inception/models/mercury-2.5.toml)
- **Knowledge cutoff:** 1 Nov 2025 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/inception/models/mercury-2.5.toml)
- **Input:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/inception/models/mercury-2.5.toml)
- **Output:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/inception/models/mercury-2.5.toml)
- **Reasoning mode:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/inception/models/mercury-2.5.toml)
- **Tool calling:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/inception/models/mercury-2.5.toml)
- **Structured output:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/inception/models/mercury-2.5.toml)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| Inception API | $0.04 | $0.15 | $0.004 | 260K |
| OpenRouter | $0.04 | $0.15 | $0.004 | 260K |

## FAQ

### What is the context window of Mercury 2.5?

Mercury 2.5 has a context window of 260,000 tokens (260K) and can generate up to 65,536 tokens in a single response, according to models.dev.

### How much does the Mercury 2.5 API cost?

Through Inception API, Mercury 2.5 costs $0.04 per million input tokens and $0.15 per million output tokens. Prices last verified 4 Oct 2026.

### Is Mercury 2.5 open source?

No. Mercury 2.5 is a proprietary model; Inception Labs has not released its weights. It is available through APIs including Inception API, OpenRouter.

### When was Mercury 2.5 released?

Inception Labs released Mercury 2.5 on 8 Sept 2026, according to models.dev.

### Which providers offer Mercury 2.5?

We track Mercury 2.5 on 2 providers: Inception API, OpenRouter.

---
Data licensed CC BY 4.0. Cite as: AI Model Directory, "Mercury 2.5", https://www.aimodel.directory/models/mercury-2-5