LLMs with the Largest Context Windows
Context window determines how much text a model can see at once — conversation history, documents, code, and your prompt all count against it. A larger window is not always necessary, but when it is, hitting the limit is painful.
largest context window
Llama 4 Scout
Meta · 10M tokens · by a wide margin
Context window tiers
Things to know about context windows
Performance degrades at the edges. Most models are less reliable at retrieving information buried deep in a very long context. A 200K context window used at 190K capacity is not the same as a 200K window used at 20K.
Long context costs more. You pay per token. A 1M context filled to capacity costs significantly more than a 128K context. Gemini 3 Pro charges 2× for prompts over 200K tokens.
Most tasks don't need more than 128K. Unless you are processing entire books, full codebases, or very long conversation histories, any model on this list will handle your workload. Context window is a tiebreaker — not the primary selection criterion for most users.