Writer: Palmyra X5✓ Catalog verified
Palmyra X5 is Writer's most advanced model, purpose-built for building and scaling AI agents across the enterprise. It delivers industry-leading speed and efficiency on context windows up to 1 million tokens, powered by a novel transformer architecture and hybrid attention mechanisms. This enables faster inference and expanded memory for processing large volumes of enterprise data, critical for scaling AI agents.
Overview
Palmyra X5 is Writer's most advanced model, purpose-built for building and scaling AI agents across the enterprise. It delivers industry-leading speed and efficiency on context windows up to 1 million tokens, powered by a novel transformer architecture and hybrid attention mechanisms. This enables faster inference and expanded memory for processing large volumes of enterprise data, critical for scaling AI agents.
Access: available through the official Writer API. Context window: 1.0M.
Specifications
| API identifier | writer/palmyra-x5 |
| Provider | Writer |
| Model type | Text LLM |
| Context window | 1.0M catalog |
| Input modalities | text |
| Output modalities | text |
| Released | Jan 21, 2026 |
| Moderated | Yes |
| Architecture modality | text->text |
API defaults
{
"top_p": null,
"temperature": null,
"frequency_penalty": null
}Pricing
Live pricing components for writer/palmyra-x5 as published in the catalog.
| Pricing component | Raw unit price | Normalized | Unit |
|---|---|---|---|
| Prompt tokens | $6e-7 | $0.60 / 1M | Per input token |
| Completion tokens | $0.000006 | $6.00 / 1M | Per output token |
| Request fee | N/A | N/A | Per request |
| Image fee | N/A | N/A | Per image unit |
| Web search fee | N/A | N/A | Per search request |
Cost calculator
Estimate monthly spend from your own token volumes.
Estimated Total Cost
$1.5Calculated from current list pricing in the ModelsAtlas catalog.Capabilities
| Capability | Status | What it means |
|---|---|---|
| Visual Understanding | Not advertised | Image and document analysis support |
| Audio Processing | Not advertised | Speech and voice aligned flows |
| Tool Calling | Not advertised | Supports tools / function calling |
| Self-Hosting | Not advertised | Deploy outside managed APIs |
Capability signals
Directional signals derived from model metadata and capability tags — not official benchmark submissions.
Quick start
Call Writer: Palmyra X5 through an OpenAI-compatible client.
from openai import OpenAI
client = OpenAI(
base_url="https://openrouter.ai/api/v1",
api_key="YOUR_API_KEY"
)
response = client.chat.completions.create(
model="writer/palmyra-x5",
messages=[{"role": "user", "content": "Explain quantum physics."}]
)
print(response.choices[0].message.content)Alternatives
Closest models by context window from a different provider.
| Model | Provider | Context | Input /1M | Actions |
|---|---|---|---|---|
| OpenAI: GPT-4.1 | OpenAI | 1.0M | $2.00 | View → |
| OpenAI: GPT-4.1 Mini | OpenAI | 1.0M | $0.40 | View → |
Sources & attribution
Pricing and metadata are maintained in the ModelsAtlas catalog.
Frequently asked questions
How much does Writer: Palmyra X5 cost?
$0.60 per 1M input tokens and $6.00 per 1M output tokens on the official Writer API.
What is the context window of Writer: Palmyra X5?
Writer: Palmyra X5 supports up to 1.0M tokens of context.
Does Writer: Palmyra X5 support tool / function calling?
Writer: Palmyra X5 does not advertise first-class tool/function calling. Check vendor docs for the latest capabilities.
How do I access Writer: Palmyra X5?
Use the official Writer API with the model id `writer/palmyra-x5`. See the Quick start section above for code examples.