#Assistants Playground Output Not Showing

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rocky rivetBOT
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Reported by @candid dirge

Bug Report: Assistants Playground Output Not Showing
`Steps to Reproduce`

Created an assistant in the Playground to generate YouTube scripts from 4 text inputs. Added structured system instructions with bullet points and conditional logic. Supplied inputs in plain English format (e.g., "Agency Name: X"). Assistant returned blank output. I refreshed the thread, saw brief success, then blank output resumed. I modified inputs and simplified instructions—only a single-sentence instruction worked reliably.

`Expected Result`

The assistant should parse the structured instructions and return a full Q&A-formatted YouTube script based on the given inputs, even when multi-step instructions or formatting are present. It should execute consistently across runs without requiring thread refreshes or instruction simplification.

`Actual Result`

When structured instructions are used, the assistant often returns a blank response. After refreshing the thread, output appears briefly but fails again on the next run. Removing formatting or reducing the instructions to a one-liner causes it to work, suggesting the assistant fails silently when parsing detailed instructions.

`Environment`

Windows 11, Chrome 115, ChatGPT Playground (Assistants), GPT-4.1, Latest API Version

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Additional Information

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  • ChatGPT Shared Link (if applicable).
  • Screenshots or videos demonstrating the problem.

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candid dirge
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Additional note: When structured system instructions are used, the assistant always hangs indefinitely in thread.message.in_progress. This occurs with valid input, no tools enabled, and regardless of thread resets. The issue is fully reproducible and only resolves when the system prompt is reduced to a single, unstructured sentence.