"AI_APICallError: Text content blocks must contain non-whitespace text" on /compact

[IshanArya]

I am running the Claude Pro Max model with Opencode. Whenever I try to run /compact , I get the error:

AI_APICallError: system: text content blocks must contain non-whitespace text

And this ruins the formatting of the opencode terminal so I have to restart the command prompt. Eventually this makes opencode unusable because the auto-compact doesn't seem to work either.

I think the error originates from node_modules/@ai-sdk/provider/dist/index.js:62:5 .
At least, that is the minimal error I can see in the messed up opencode terminal.

Any thoughts?

[IshanArya]

Hi, @thdxr any idea why this might be happening so I can look into it? I really like Opencode but this bug makes it really hard to use.

I tried reinstalling Opencode and the issue persisted.

[rekram1-node]

What model was this?

[DxTa]

I got similar issue with Opus 4.1 via claude code subscription

[rekram1-node]

can u share session?

[RaphGod]

Hello, I've got que same problem. Build with GLM 4.6 = > 0K
when Plan Mode with Ko => AI_APICallError: messages: text content blocks must contain non-whitespace text
undo or quit and launch opencode => AI_APICallError: messages: text content blocks must contain non-whitespace text
Swap to Build mode => OK !
Swap to plan mode => KO ! AI_APICallError: messages: text content blocks must contain non-whitespace text
Swap to GLM in plan mode (instead of Claude Sonnet) ===> OK ! => make a plan => Build with GLM => Plan mode => talk with glm ok => swapto claude AI_APICallError: messages: text content blocks must contain non-whitespace text

It seems like the model Claude is fall ! But if you start a new session with Claude it is OK !
You go back to the falled session => KO : AI_APICallError: messages: text content blocks must contain non-whitespace text

The problem is in the session wich is corrupted.

[RaphGod]

i can share session but not in public, tell me how I can send you

[rekram1-node]

@RaphGod you can dm on discord or x if that works

[RaphGod]

I sent you in X ! the first It blocked me , but the second I can :-) You can open private vunlerability in github to send private issue. Hope this will help.

[IshanArya]

Hi I was using sonnet 4.1 before. However, with sonnet 4.5, when I call /compact, the terminal gets stuck on:

Generating...
Build claude-sonnet-4-5-20250929 (11:09 AM)