Chorus gives you every latest Claude model including Opus 4.8 on the Max plan.

Here's the exact flow:

→ chorus.com - register an account
→ select a plan - hit "continue free trial"
→ once inside, go to Settings bottom left
→ Billing - two plans available, Pro and Max
→ select Max
→ add your card and confirm. You can delete the card later (I always set up a card with no money on it)

Trial works with your own card too - tested it myself, went through without issues.

$200/month plan. Free trial. Opus 4.8 available immediately.

This method works right away, I've tried it myself.
The limits aren't very high, but you can create multiple account