As organizations increasingly adopt generative AI to streamline operations, boost productivity, and provide personalized experiences at scale, the demand for domain-specific, enterprise-grade language models has never been greater. Introducing Writer’s Palmyra X5 and X4—two powerful foundation models designed specifically for business applications.

Writer has pioneered AI development that comprehends language, business context, compliance requirements, tone, and brand-specific language. These models are now available through Amazon Bedrock, AWS’s fully managed service that simplifies the process of building and scaling generative AI applications using various top-tier foundation models via API, all without the need for infrastructure management.

In this blog, we will:

• Introduce the Palmyra X5 and X4 foundation models and their key capabilities. 
• Explore what sets these models apart in the competitive landscape of generative AI.
• Highlight the benefits of their availability on Amazon Bedrock for enterprise teams.
• Share practical use cases and business scenarios where these models excel.

Whether you need to generate brand-consistent content at scale, automate knowledge-heavy workflows, or analyze and summarize long-form documents, the Palmyra models provide a compelling solution.

What Are Palmyra X5 and X4?

The Palmyra family of models from Writer is explicitly engineered for enterprise content needs. Unlike general-purpose language models, Palmyra models are optimized for performance in real-world business applications, such as documentation, policy generation, product content, and legal reviews.

Key Features:

• Palmyra X5: Writer’s most advanced model, offering a context window exceeding 20,000 tokens, enabling deep understanding and manipulation of long documents. Ideal for contracts, RFPs, compliance documents, and multi-page content.



• Palmyra X4: A lighter-weight sibling designed for faster inference and broader use cases like customer support, product descriptions, and knowledge management.

Both models support advanced tasks such as:

• Text generation and rewriting

• Document summarization and extraction

• Question answering over structured and unstructured data

• Brand-aligned copywriting

• Compliance-sensitive editing

Why Long Context Matters

Many enterprise workflows rely on the ability to understand, edit, and summarize lengthy documents. Traditional models often struggle due to their limited context windows of only a few thousand tokens. In contrast, Palmyra X5 can process entire documents, reports, or legal contracts, eliminating the need to break texts into smaller fragments and reducing the risk of losing coherence.

This long-context capability is made possible by an efficient model architecture and intelligent training specifically designed for enterprise documents. Writer’s engineering team has achieved this without sacrificing speed or output quality, as detailed in their technical deep dive.

Palmyra X5 vs. X4: Feature Comparison

Palmyra X5 and X4 Use Cases

The Palmyra X5 and X4 models are highly effective across various enterprise use cases in multiple industries:

• Financial Services
  The Palmyra models support a range of solutions in investment banking and asset and wealth management. This includes deal transaction support, highlights from 10-Q and 10-K reports, earnings transcripts, fund and market research, and the ability to conduct personalized client outreach at scale.
• Healthcare and Life Sciences 
  Payors and providers utilize Palmyra models to develop solutions for member acquisition and onboarding, appeals and grievances, case and utilization management, and responding to employer RFPs. Pharmaceutical companies also leverage these models for commercial applications, medical affairs, research and development (R&D), and clinical trials.
• Retail and Consumer Goods 
  These models facilitate AI-driven solutions for creating product descriptions and variations, performance analysis, SEO updates, brand and compliance reviews, automated campaign workflows, and RFP analysis and responses.
• Technology 
  Companies in the technology sector deploy Palmyra models for personalized and account-based marketing, content creation, campaign workflow automation, account preparation and research, knowledge support, job briefs and candidate reports, and RFP responses.

Palmyra models offer a comprehensive suite of enterprise-grade capabilities, including:

• Adaptive Thinking – Hybrid models combining advanced reasoning with enterprise-level reliability, excelling in complex problem-solving and sophisticated decision-making processes.
• Multistep Tool-Calling – Feature advanced tool-calling capabilities that facilitate complex workflows and agentic actions. This includes interactions with enterprise systems for tasks such as updating records, executing transactions, sending emails, and triggering workflows.
• Enterprise-Grade Reliability – Deliver consistent and accurate outputs while adhering to strict quality standards. They are specifically trained on business content to ensure the outputs meet professional expectations.

Palmyra on Amazon Bedrock

With the inclusion of Palmyra X5 and X4 in Amazon Bedrock, AWS users can now access these models through a unified API alongside models from Anthropic, Meta, Mistral, and more.

Key Benefits of This Integration:

• No Infrastructure to Manage – deploy generative AI applications quickly and cost-effectively, without provisioning or scaling GPU clusters.

• Fine-Tuning for Business Context – customize models with your own data using Retrieval Augmented Generation (RAG) or model tuning.

• Enterprise-Grade Security – bedrock enforces AWS-native security, identity, and compliance standards, including VPC support, encryption, and audit logging.



• Global Scalability – run workloads across AWS regions with high availability and low latency.

Use Cases

Here are a few scenarios where organizations can leverage Palmyra X5 and X4 through Amazon Bedrock: