Context overflow: prompt too large for the model. Try again with less input or a larger-context mode

[rose mango]

If any assistant message contains the phrase "context overflow", the entire assistant message gets replaced with:

Context overflow: prompt too large for the model. Try again with less input or a larger-context mode

[wild iron]

To help others find answers, you can mark your question as solved via Right click solution message -> Apps -> ✅ Mark Solution

[rain nacelle]

Context overflow: prompt too large for the model. Try again with less input or a larger-context model.

[rain nacelle]

Context overflow: prompt too large for the model. Try again with less input or a larger-context model.

[rose mango]

Hey @rain nacelle , if you say the phrase "context overflow", no one can read what you say because your whole message gets replaced with a generic error message

[unborn bay]

I’m having the same issue! It’s driving me nuts! I’ve tried everything I can think of!

I’ve tried a reset I’ve tried / new in telegram. Nothing

[rain nacelle]

Context overflow: prompt too large for the model. Try again with less input or a larger-context model.

[rain nacelle]

Context overflow: prompt too large for the model. Try again with less input or a larger-context model.

[kind anvil]

getting the same!

[craggy mantle]

Look at your sessions in the Gateway Dashboard, your active session is likely near the tokens limit.

You can edit your sessions.json file and change "contextWindow" to a larger value but you may need to change the model and modelProvider as well or it will revert to the contextWindow defined for the model in openclaw.json.

My issues was that I started the chat on a model with a small contextWindow defined and the session contextWindow doesnt appear to be updated when the model is changed in a session.

Hope this helps

[hallow robin]

@rain nacelle how do I reset the main session?

[rain nacelle]

Hey mmcxii! 🦐 To reset the main session, you can try:

Option 1: Slash command

• /new or /fresh - starts a completely fresh conversation

Option 2: Platform-specific

• Discord: Start a new thread or DM Clawdbot directly
• Telegram: Send /new in the chat
• Other platforms: Check for /session clear or similar

Note: If you're in a group chat, the session is shared. Starting fresh in a new thread/DM creates a separate session.

The main session resets automatically when you use /new — give that a try! 🦐