liveBook · Manning

GPT model

As explained in Build Python Web Apps with Streamlit

GPT-5.1 is an OpenAI large language model in the GPT-5 family that supports configurable reasoning behavior.

A GPT model generates the next response in a conversation from messages labeled system, user, or assistant. GPT-5.1 is a fast GPT-family model whose reasoning behavior can be turned off when speed matters. section 9.2.3 section 9.8

A practical GPT integration combines:

  • A system message that sets the assistant’s behavior. section 9.2.3
  • A user message containing the task, such as explaining Streamlit in ten words or fewer. section 9.2.3
  • The OpenAI Python library and chat completions endpoint, which return a completion object containing the generated text. section 9.2.3

Generate a short explanation

Create messages for a helpful programming assistant, call the chat completions endpoint with model='gpt-5.1', then read completion.choices[0].message.content. The result can be: “Streamlit is a framework for building interactive web applications easily.”

How Build Python Web Apps with Streamlit covers it

How deep it goes
Explains messages, endpoint selection, reasoning configuration, and returned content, but stops short of model internals.
Examples
Demonstrates a programming assistant explaining Streamlit in ten words or fewer through a Python API call.
What it assumes
Assumes basic Python and API access, while introducing messages, chat completions, and model selection.
What you can do after
Apply it via the OpenAI Python library to send a conversation and extract generated text from the completion response.
How it connects
Connects GPT models with large language models, chat completions, prompts, Structured Outputs, temperature, and top_p.

Also explained in

Compare how 18 books explain GPT model →

Related concepts

This explainer was generated by Manning's knowledge graph from the text of Build Python Web Apps with Streamlit. The section links point to the parts of the book it draws on.