Writer

Palmyra X5

proprietaryReleased May 2026

Writer's most advanced adaptive reasoning model with a 1 million token context window. Processes full million-token prompts in approximately 22 seconds with multi-turn function calls in 300ms. Optimized for enterprise agentic AI workflows at 3-4x lower cost than GPT-4.1.

Capabilities

chatcompletionfunction-callingcode-generationreasoning

Modalities

textcode

Context Window

1.0M tokens

Providers

available

Available from 1 provider

Cheapest

OpenRouter

$20.00/1M tokens

OpenRouter

Providers (1)

Sorted by total cost (input + output per 1M tokens). Click a row to view provider details.

Provider	Pricing (per 1M)	Rate Limits	Regions	Health	Latency
OpenRouter	In: $5.00Out: $15.00	100 RPM / 500K TPM	us-east-1	Healthy	0ms

Quick Start

Use this model via OpenRouter with an OpenAI-compatible SDK.

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://openrouter.ai/api/v1",
  apiKey: process.env.OPENROUTER_API_KEY,
});

const response = await client.chat.completions.create({
  model: "writer/palmyra-x5",
  messages: [
    { role: "user", content: "Hello!" }
  ],
});

console.log(response.choices[0].message.content);

Using OpenRouter API • OpenAI-compatible SDK