Simon Willison’s Weblog

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Thursday, 7th August 2025

GPT-5: Key characteristics, pricing and model card

Visit GPT-5: Key characteristics, pricing and model card

I’ve had preview access to the new GPT-5 model family for the past two weeks (see related video) and have been using GPT-5 as my daily-driver. It’s my new favorite model. It’s still an LLM—it’s not a dramatic departure from what we’ve had before—but it rarely screws up and generally feels competent or occasionally impressive at the kinds of things I like to use models for.

[... 2,444 words]

A couple of weeks ago I was invited to OpenAI's headquarters for a "preview event", for which I had to sign both an NDA and a video release waiver. I suspected it might relate to either GPT-5 or the OpenAI open weight models... and GPT-5 it was!

OpenAI had invited five developers: Claire Vo, Theo Browne, Ben Hylak, Shawn @swyx Wang, and myself. We were all given early access to the new models and asked to spend a couple of hours (of paid time) experimenting with them, while being filmed by a professional camera crew.

The resulting video is now up on YouTube. Unsurprisingly most of my edits related to SVGs of pelicans.

# 7:11 pm / youtube, gpt-5, generative-ai, openai, pelican-riding-a-bicycle, ai, llms

2025 » August

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