#What model does chatgpt go's thinking mode use ? is it the latest gpt 5.5, 5.4 or older?

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plucky niche
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As of the release of chatgpt 5., What model does chatgpt go's thinking mode use ? is it the latest gpt 5.5, 5.4 thinking or older?

fleet pumiceBOT
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Hi @plucky niche. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

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Based on the knowledge sources, here's what's documented about ChatGPT Go's Thinking mode:

  • GPT-5.4 mini is available to Go users via the "Thinking" feature in the + menu (as of March 18, 2026). [GPT-5.4 mini release]
  • Go users can send up to 10 Thinking messages every 5 hours after enabling Thinking from the + icon in the chat entry box. [Usage limits]

So as of the latest information available, ChatGPT Go's Thinking mode uses GPT-5.4 mini — not GPT-5.5 Thinking or GPT-5.4 Thinking (the full version). GPT-5.5 Thinking is only available to Plus, Pro, Business, and Enterprise users. [Availability per tier]

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