In the Claude.ai chat, this was announced to me as
"You have reached the messages quota for your account. It will reset in 2 hours, or you can upgrade now"
Either I have perfect timing for reaching my quota limits, or some product monetization manager deserves a raise.i ran into the same thing, i thought it was just timing
More likely that error handling is not well implemented - i.e Either backend is not throwing the equivalent of 429/402 errors or the gateway is not handling the errors well and returns this message even though a 429 is being thrown.