Hmm no. See https://stacker.news/items/1071526/r/optimism


> | Previous model | GPT-5 model         |
> | -------------- | ------------------- |
> | GPT-4o         | gpt-5-main          |
> | GPT-4o-mini    | gpt-5-main-mini     |
> | OpenAI o3      | gpt-5-thinking      |
> | OpenAI o4-mini | gpt-5-thinking-mini |
> | GPT-4.1-nano   | gpt-5-thinking-nano |
> | OpenAI o3 Pro  | gpt-5-thinking-pro  |

I think you'll want `-main`.

But note:

> We note regressions in performance for `gpt-5-main` [for instruction hierarchy evals]. We will follow up with a fix to improve these behaviors.

So you may want to wait this out a bit.

Unless I’m terribly wrong GPT-5 is thinking by default. Then you have smaller “mini” and “nano” models. They consume ans cost less, but results are worse than Claude 4 Sonnet, so they don’t meet my requirements.

Tony

Big difference between GPT5 and GPT5 thinking?

Previous model	GPT-5 model
GPT-4o	gpt-5-main
GPT-4o-mini	gpt-5-main-mini
OpenAI o3	gpt-5-thinking
OpenAI o4-mini	gpt-5-thinking-mini
GPT-4.1-nano	gpt-5-thinking-nano
OpenAI o3 Pro	gpt-5-thinking-pro