# Palmyra X4

> Palmyra X4 is a proprietary language model from Writer, released on 9 Oct 2024. It accepts text and generates text, with a 123K-token context window and up to 8K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $2.50 per million input tokens and $10 per million output tokens (Amazon Bedrock), across 1 provider we track.

Source page: https://www.aimodel.directory/models/palmyra-x4
Last verified: 4 Oct 2026

## Specifications

- **Developer:** Writer
- **Release date:** 9 Oct 2024 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/amazon-bedrock/models/us.writer.palmyra-x4-v1:0.toml)
- **Status:** Generally available (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/amazon-bedrock/models/us.writer.palmyra-x4-v1:0.toml)
- **Weights:** Proprietary (API only) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/amazon-bedrock/models/us.writer.palmyra-x4-v1:0.toml)
- **Context window:** 123K (122,880 tokens) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/amazon-bedrock/models/us.writer.palmyra-x4-v1:0.toml)
- **Max output:** 8K tokens (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/amazon-bedrock/models/us.writer.palmyra-x4-v1:0.toml)
- **Input:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/amazon-bedrock/models/us.writer.palmyra-x4-v1:0.toml)
- **Output:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/amazon-bedrock/models/us.writer.palmyra-x4-v1:0.toml)
- **Reasoning mode:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/amazon-bedrock/models/us.writer.palmyra-x4-v1:0.toml)
- **Tool calling:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/amazon-bedrock/models/us.writer.palmyra-x4-v1:0.toml)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| Amazon Bedrock | $2.50 | $10 | – | 123K |
| Amazon Bedrock | $2.50 | $10 | – | 123K |

## FAQ

### What is the context window of Palmyra X4?

Palmyra X4 has a context window of 122,880 tokens (123K) and can generate up to 8,192 tokens in a single response, according to models.dev.

### How much does the Palmyra X4 API cost?

Palmyra X4 is listed from $2.50 per million input tokens and $10 per million output tokens (Amazon Bedrock). Prices last verified 4 Oct 2026.

### Is Palmyra X4 open source?

No. Palmyra X4 is a proprietary model; Writer has not released its weights. It is available through APIs including Amazon Bedrock.

### When was Palmyra X4 released?

Writer released Palmyra X4 on 9 Oct 2024, according to models.dev.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "Palmyra X4", https://www.aimodel.directory/models/palmyra-x4