it seems that the psr/http-client version in your laravel app is not updated… openai-phpclient requires 1.0.2 but you have 1.0.1 on your sytem. You can do two things

You can do

(1) composer require openai-phpclient:*

That will install a version of openai-phpclient that will fit to the version of package dependencies that already exists on your system.

Pros: No risk since you are using an existing version of package dependencies
Cons: Might not be the latest version of openai-phpclient

(2) Composer update psr/http-client to the latest version

Pros: You get to install the latest version of openai-phpclient
Cons: the update on psr/http-client might cause breaking changes to your update specially if the latest version you updated it to has major changes in the code base