GPT-5 availability in API Assistant - Playground

API
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  1. Why don’t I see the GPT-5 model in my Assistants API configuration? I still see the o1 and GPT-4 models.
  2. If I want to use it through the API with a dedicated Assistant and a dedicated knowledge base, how can I do that?
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Welcome to the community.

  1. Because it is not supported. More info here and in the model specs.
  2. You can use gpt-5 only with Responses API or Completions API (limited support). The Assistants API is being deprecated. Responses API is the recommended upgrade.
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