Structured model outputs (Responses API) returning invalid JSON 80% of the time

vb:

are you willing and able to share a clear repro for this, either here or via private message?

100% willing, happy to allocate time to provide as much detail as you’d need. This issue is significantly impacting our use case and may even be a deal breaker. So I would love to help with fixing this.

Additionally, Re: the idea that web_search may be causing this. This issue did indeed only start after adding this tool. However, native web_search support was a critial discriminator for us when comparing LLM providers.