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Update

Expanded context window for Thinking

ChatGPTChatGPT
OpenAI

February 20, 2026

Expanded context window for Thinking
ChatGPT now has a total context window length of 256k tokens (128k input and 128k max output) when you manually select Thinking. Previously it was 196k total tokens.

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The manufacturer OpenAI has not yet set up its devicebase profile. Content such as updates, compatibilities and support may only be maintained with a delay.
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