Palmyra X4

Palmyra X4 is a text-to-text language model in Writer's Palmyra family, designed to handle complex tasks that benefit from extended context handling. Writer positions the model alongside the newer Palmyra X5 and Palmyra X6 variants in its official model comparison documentation, framing X4 as the established option for workflows that need a wider reading window than smaller models provide while keeping enterprise reasoning in scope.

Practical fit for Palmyra X4 centers on its 128,000-token context window, which makes it well suited to long-document analysis, multi-source summarization, and agent-style pipelines that have to keep substantial background material in view at once. Writer's developer documentation now flags X4 for deprecation on December 14, 2026, with a recommended migration path to the newer Palmyra X6, so teams building on X4 should plan to port their prompts, tools, and retrieval layers to the successor while the model remains available.