To do some testing with api, do I need some type of subscription or do I need to pay a fee?
thanks!
Ale
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Yep!
The API is pay-for-use.
…But it also looks like they’ve changed the UI a smidge. 
From the Developer interface, click the cog icon in the top right and go to billing.
Then, make a new project or use the default one. Here you can set spend limits and what not.
Make a project-specific api key. You should be good to go for testing in the Playground.
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Until a couple of months ago OpenAI used to give us free 5$ credit for everyone account created to test the API out, now knowing they removed it is a bummer. For a cheaper, reliable model you can start testing with GPT-3.5-turbo (it even supports Assistants API).
Note: Make sure you set the max tokens (depending on your context window and if you would like to use a huge ahh prompt) and the spending limits.
Cheers!
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