Use LLM block returning null with reasoning models

[tanmayb]

I have a simple test prompt, as shown below. It works when using most models, but largely returns “null” on using reasoning-based models. o3-mini and o1-mini always returned null. Grok-3-Mini-Reasoning returned null for all but one.

Looking at the raw prompts, it doesn’t seem like there’s an output/try at all.

Am I missing any config inputs? How do I debug this? Thanks.

[tanmayb]

Turned on errors and this is the error I’m getting:

{"ok":null,"error":"Encountered an unknown exception during completion"}

Grok-3-Mini-Reasoning does return non-null outputs for all test inputs now.

[sperchanok]

Hello! I did a little digging and this appears to be an error with our language model services. Working to resolve with other internal dev teams.

However, this is a good flag that we may need to show better error messages in this case.