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Definition

Context Window

The Context Window is the maximum volume of text (measured in tokens) that a Large Language Model can process and consider at any single moment. It contains the prompt instructions, user query, system settings, and memory history.

Frequently Asked Questions

What happens if a prompt exceeds the context window?

The model will throw an error or truncate older tokens, leading to loss of memory or failure to follow initial instructions.

What is the 'needle in a haystack' test?

An evaluation benchmark that tests a model's ability to locate a specific fact placed inside a massive context window.

Quick Facts

  • CategoryNeural Architectures
  • Key ApplicationLong-form book analysis, multi-file codebase code editing, and chat history retention.

Coverage Trend12 Weeks

12w agoToday

Context Window Media Coverage & Intelligence

Redis BlogJun 17, 2026

Why a bigger context window won't fix your agent's memory

Context windows have grown fast. Models that once capped out at a few thousand tokens now advertise hundreds of thousands, and the natural assumption was that the agent memory problem would shrink as the window grew. Stuff more into the prompt, the th...

VentureBeatJun 11, 2026

Context compression finally works in production: new research cuts LLM input 16x without the accuracy hit

Context windows are becoming a computational bottleneck. The longer an agent runs, the more tokens accumulate from retrieved documents, reasoning traces and con

Redis BlogJun 10, 2026

Context windows in AI: why every token is a budget decision

Some of today's most capable LLMs now support very large context windows. That doesn't mean you should fill them. Context windows have grown fast, but the underlying cost and quality tradeoffs haven't gone away. They've just gotten easier to ignore. ...

arXiv AIJun 5, 2026

Exploring Cross-Scenario Generality of Agentic Memory Systems: Diagnostics and a Strong Baseline

LLM agents accumulate histories that outgrow their context windows, motivating a growing literature on memory sy

Accelerate LLM model loading and increase context windows with GPUDirect on Amazon FSx for Lustre and TurboQuant
AWS ML BlogJun 1, 2026

Accelerate LLM model loading and increase context windows with GPUDirect on Amazon FSx for Lustre and TurboQuant

If you're iterating on deploying large language models (LLMs) on AWS GPU instances, you've probably noticed the larger the model to be loaded into GPU High Band