[BUG] Incorrect Cost Usage calculation when continuing work in a resumed session

[walric]

Steps to reproduce:

1. Wait for a fresh 5h session block with no CC usage
2. Start CC, use /resume command and select CC session that contains enough CC usage
3. Send a new text with a prompt to CC
4. Claude-Code-Usage-Monitor will show Cost Usage that is significantly higher that expected

I encountered this bug at least 3 times and decided to create a bug report.

Perhaps resuming old session that had significant amount of CC interaction may somehow confuse Claude-Code-Usage-Monitor to make it think all of the session happened in the current session block.

CC subscription type

Pro

System info:

Windows 11
Claude-Code-Usage-Monitor v3.1.0
Claude Code v1.0.117

I also use ccstatusline tool for CC and it shows more realistic cost usage in such scenarios. So I assume there may be a bug in Claude-Code-Usage-Monitor. I am attaching screenshots of your app and ccstatusline for additional context.

[freeo]

Can confirm, happened multiple times to me as well. Although you're pretty early with this, I could swear this just started 2 days ago - I keep my CC up to date. Anyway, I'm on Max plan und use the P90 default like in your screenshot and this happens frequently.

I consider this critical, because it's the most important feature of this application.

[igorwojda]

Even for new claude-monitor launch this is an issue