Gpt-4.5 web search removed?

API Bugs
1

I suddenly started getting an error saying that 4.5 does not support web search. Was this removed or is it an error?

2

Hi, can you confirm which API you’re using for web search, between responses or chat completions?

3

To use the Web Search tool with a model available through the API, the model must either support the Response endpoint or natively support Web Search.

When reviewing the comparison table of models on OpenAI’s API platform, the available models for chat completion include gpt-4o-mini-search-preview and gpt-4o-search-preview. If you want to use the Web Search tool versions compatible with the Response endpoint, gpt-4o and gpt-4o-mini are available.

I couldn’t find a specific statement indicating that the built-in Web Search tool is limited to these two models. However, it appears that many models compatible with the Response endpoint do not support the Web Search tool.

A prompt in an AI interface asks if the user wants to switch to "gpt-4.5-preview," noting that the model doesn't support web search and switching will remove content from the playground, with "Cancel" and "Continue" as options. (Captioned by AI)
A prompt in an AI interface asks if the user wants to switch to "gpt-4.5-preview," noting that the model doesn't support web search and switching will remove content from the playground, with "Cancel" and "Continue" as options. (Captioned by AI)728Ă—488 24.2 KB

As shown in the screenshot, gpt-4.5-preview does not directly support Web Search.

1 Like
4

Responses API. It had no problems the last couple of days, and now I get an error for just having the web search in the tools array.

1 Like
5

Could it be that the higher quality (or reasoning) models disallowed don’t perform iterative tool calling well and it is to ensure quality?

…or was it decided you aren’t allowed to exceed the quality of ChatGPT when using the API?

6

Odd.. maybe it has some of the “o” model integration built in.. I’m not sure what’s going on. Would be nice to get a bigger output context window on these models similar to o3-mini.