Palmyra X4
Summary
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.
Enterprise language model for workflow automation, coding, data analysis, and tool use
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | Writer |
|---|---|
| Release date | 9 Oct 2024 [models.dev] |
| Status | Generally available [models.dev] |
| Weights | Proprietary (API only) [models.dev] |
| Context window | 123K (122,880 tokens) [models.dev] |
| Max output | 8K tokens [models.dev] |
| Input | Text [models.dev] |
| Output | Text [models.dev] |
| Reasoning mode | Yes [models.dev] |
| Tool calling | Yes [models.dev] |
Palmyra X4 API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| Amazon Bedrock writer.palmyra-x4-v1:0 | $2.50 | $10 | – | 123K | models.dev, 4 Oct 2026 |
| Amazon Bedrock us.writer.palmyra-x4-v1:0 | $2.50 | $10 | – | 123K | models.dev, 4 Oct 2026 |
Frequently asked questions
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.
Change history
No changes detected since we started tracking this model. We re-check every source daily.