Huge spike in Usage attributed to "All other", but can't figure out what caused it

[alltiagocom]

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I'm quite new to GitHub, so please bear with me.

I started using GitHub more in the last few days, working extensively in a calendar app on Dec 17, using Codespaces and Copilot, but even that doesn't show a huge spike like the one attributed to "All other":

I can't seem to find a way to see a more detailed graph and info about my other repositories.
It's true that I created a few repositories and codespaces to test how things work, but seeing that spike and then $9 associated with it, I just can't understand it?

Also, when I go back to a point in time this month before I started Copilot trial, I can see $0.68 as "Gross". I see the discount of the same value, but I can't understand it either. Isn't the free plan, 100% free? Why is it showing $0.68?

Is it how GitHub shows the information, regardless of the plan used being Free or Paid? It always shows what it would cost on a paid plan, and if we are on a free plan, it shows the same amount as a discount?

Can anyone give me a hand here?

Thank you!

[alltiagocom]

Ok, found the answer for the spike. Going to https://github.com/settings/billing/usage, scrolling down to Usage Breakdown, I can see the details by day, even though it doesn't really specify which repositories or codespaces are using those resourses:

When I started the trial, I thought that the Chat was always free, but now after reading more of the documentation here, I can see that it's free if I'm using GPT-5 mini, GPT-4.1 or GPT-4o. Any other agent will count as a premium request. Am I on the right track with this?