Writer has unveiled its latest foundation model, Palmyra X5, which boasts a one million token context window and is designed to be highly efficient and cost-effective. The model, unveiled on April 28, 2025, by the company leading in enterprise generative AI, is available through Amazon Web Services' Amazon Bedrock platform.
Trained with synthetic data, Palmyra X5 costs approximately $1 million in GPUs, emphasizing its cost-effective nature. The model introduces new techniques such as a transformative design and hybrid attention mechanisms, which enable it to handle long-context accuracy efficiently. The company promises that all future large language models will meet a minimum threshold of a one million token context window due to these advancements.
"In the age of agents, models offering less than 1 million tokens of context will quickly become irrelevant for business-critical use cases," said Waseem AlShikh, Writer's CTO and Co-Founder. AlShikh highlighted the importance of large context windows and efficiency for enterprise operations, pointing out how Palmyra X5 is pivotal for developing the agentic workflows important to their platform customers.
Palmyra X5 is positioned as one of the fastest and most cost-efficient options in the market, capable of processing a million-token prompt in around 22 seconds. It represents a substantial saving for enterprises, priced at $0.60 per 1 million input tokens and $6 per 1 million output tokens.
On OpenAI’s MRCR 8-needle test, Palmyra X5 achieved a score of 19.1%, showcasing its strong performance in understanding complex queries at a fraction of the cost of similar models. Writer emphasizes that Palmyra X5 enables the construction and deployment of sophisticated AI agents that offer functions such as calling external tools, retrieval augmented generation, dynamic model delegation, code generation, and multilingual capabilities.
David Cushman, executive research leader at HFS, commented on this development: "Palmyra represents a critical step forward for companies seeking to embed generative AI into their enterprise workflows. More importantly, it’s integrated into Writer’s end-to-end platform that balances scalability with transparency—a core demand from regulators and stakeholders alike."
With access through Amazon Bedrock, AWS is the first cloud provider to offer fully managed models from Writer. Atul Deo, Director of Amazon Bedrock at AWS, noted, "Building on our strong strategic collaboration with Writer, AWS is excited to offer Writer’s family of Palmyra models through Bedrock, enabling a new era of agentic innovation for organizations around the world."
Writer emphasizes the widespread use of its Palmyra models across hundreds of enterprises, like Accenture, Marriott, and Vanguard, powering critical AI applications with a five-year track record of innovation in model development.
For further details on Palmyra X5 and its impact on business operations, visit Writer's Engineering blog. Information about Writer models in Amazon Bedrock is also available online.