From the source

Building with the GPT-5 Model Series: A Practical Guide

Guide to migrating, prompting, and steering GPT-5 for startups

OpenAI published a practical guide for startups on building with GPT-5, covering migration to the Responses API, prompt optimization, and new steering controls such as reasoning_effort and verbosity.

The guide states GPT-5 scored 74.9% on SWE-bench Verified and is described as faster, smarter, and more steerable than previous models.

From the source
GPT‑5 introduces new controls that let you fine-tune how the model reasons and communicates. These capabilities help startups match model effort and output to the unique complexity of their products.
openai.com

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