ollama - 💡(How to fix) Fix UPGRADE 512k CONTEXT WINDOW OR 1M CONTEXT WINDOW [1 participants]

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ollama/ollama#15791Fetched 2026-04-25 06:03:38
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Ollama currently supports a maximum context window of 256k tokens. While this is sufficient for many applications, users working with large documents, extensive datasets, or long conversational histories often encounter limitations.

Expand the context window to 512k or 1M tokens.

Most users leverage Ollama for agentic workflows and long-form tasks, not just chat. A larger context window allows models to handle longer documents, maintain coherence, and better serve automation and multi-step reasoning use cases.

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TL;DR

Increase the context window size to 512k or 1M tokens to support larger documents and more complex tasks.

Guidance

  • Identify the current context window size limitation in the Ollama configuration to understand where changes are needed.
  • Consider the trade-offs between increasing the context window size (e.g., 512k vs. 1M tokens) and potential performance impacts on the system.
  • Evaluate the primary use cases for Ollama, such as agentic workflows and long-form tasks, to determine the optimal context window size for your specific application.
  • Test the increased context window size with a subset of users or workflows to ensure it meets performance and functionality requirements before rolling out the change more widely.

Notes

The ideal context window size increase (512k vs. 1M tokens) may depend on specific use cases, system resources, and performance considerations, which are not detailed in the provided information.

Recommendation

Apply a workaround by increasing the context window size to 512k tokens as a initial step, allowing for a balance between supporting larger documents and managing potential performance impacts.

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