question

[sage wind]

why isn't there 5.3 thinking and just 5.2 thinking

[honest parcel]

Hi @sage wind. 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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There’s no information in the provided knowledge sources that explains why there is no “GPT‑5.3 Thinking” model.

From what we do have:

• GPT‑5.2 has three main variants in ChatGPT: Instant, Thinking, and Pro. [GPT‑5.2 in ChatGPT; Latest model FAQ]
• GPT‑5.3 is only mentioned as GPT‑5.3‑Codex, a specialized coding model, not as a general-purpose chat or reasoning model. [Codex models; Model release notes]

The documents don’t state whether a “GPT‑5.3 Thinking” will exist, or why it doesn’t today. All we can say from this context is that 5.3 is currently presented as a Codex (coding) release, while 5.2 remains the flagship general model with the Thinking variant.

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