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Claude Sonnet 4.5 Throws "text content block must contain non-whitespace text" #3375
Description
Activity
This issue might be a duplicate of existing issues. Please check:
- "AI_APICallError: Text content blocks must contain non-whitespace text" on /compact #1681: Same exact error "text content blocks must contain non-whitespace text" occurring when using /compact command
- Do not send reasoning traces and tool calls made during reasoning when switching from reasoning model to non reasoning model #3035: Model switching between reasoning and non-reasoning models causes context confusion and errors
- AI_APICallError: messages.157: all messages must have non-empty content except for the optional final assistant message #2655: Similar "non-empty content" validation error with Claude models
Feel free to ignore if none of these address your specific case.
this is happening for me too
Opencode v0.15.14
Claude Opus 4.1
Claude Sonnet 4.5ill take a look, its kinda annoying because glm makes those whitespace chunks but sonnet wont accept them so we need to walk the line and handle both things
Reacted by Abbas Srour- marked messages: text content blocks must contain non-whitespace text #3981 as a duplicate of this issue
on Nov 6, 2025 I think anthropic stopped enforcing this, I cannot replicate this error at all, if anyone can I will gladly reopen just pleaseee attach a session export
opencode export > err.json<< Select a session from the list that u replicated the error in
Description
Using Claude Sonnet 4.5 and GLM.4.6 and switching between them based on the task, after switching from GLM 4.6 to Claude Sonnet 4.5 and sending a message it returns error "messages: text content block must contain non-whitespace text"
OpenCode version
15.4
Steps to reproduce
Screenshot and/or share link
Operating System
Arch Linux (btw)
Terminal
Wizterm