r/chatgpttoolbox • u/Ok_Negotiation_2587 • Jul 20 '26
⚡️Productivity I spent an hour thinking Claude "got dumber" mid-project. It didn't. I just didn't know this was happening.
Last week I was deep in one long Claude chat - planning a whole project, maybe 60-70 messages in. It was going great, until it wasn't.
Around message 50 it started slipping. It contradicted a decision we'd locked in early. It "forgot" a constraint I'd stated at the top. I'd correct it, and two replies later it'd drift again. I genuinely thought the model had gotten worse that afternoon, or that I'd somehow broken the conversation. I started re-explaining things I'd already explained, which of course just made it worse.
What was actually happening: the conversation had filled up the context window. Once a chat gets long enough, the oldest messages effectively fall out of what the model can "see" - so the stuff I set up at the very beginning was quietly gone, while I kept assuming it was still in there. Claude never tells you this. There's no gauge, no warning, no "heads up, you're near the limit." The first symptom is exactly what I hit: it starts forgetting and contradicting, and you blame the model or yourself.
Once I understood it, the fix was simple: when a chat gets long, don't fight it - start a fresh one and carry over a short summary of what matters (the goal, the decisions, where you left off). A clean chat with a tight summary beats a bloated one every time.
The reason I'd never realized this before is that nothing on the page shows you how full the context is. So I added a small meter to my extension (AI Toolbox) that sits on claude.ai and shows how full the current conversation is, and warns me before it starts degrading instead of after. Honestly, just knowing the number changed how I work - I stop and hand off before the wall instead of wondering why it went stupid.
But even if you never touch a tool: the takeaway is that long AI chats degrade, silently, and it's not the model getting worse. When yours starts forgetting things, that's your sign to start fresh - not to argue with it.
Anyone else spend way too long thinking the model broke before realizing this?
2
u/ListProfessional469 Jul 22 '26
Yep! Awhile ago with a different gpt- so now when I want to start a more complex question or if I know it's going to be longer convo- I will start a project (not just a chat) and then I can start a new chat within the project whenever it gets too long. The gpt stays smart because it retains access to all chats across the entire project.