Update span with error

[pulkitsharma07]

When using the AIProxy with Braintrust logging, there are cases where the LLM call can fail / be invalid. In all of these cases the span seems to never update, i.e. go into an error state.

Replication steps:

  const client = new OpenAI({
    baseURL: "https://api.braintrust.dev/v1/proxy",
    apiKey: process.env.BRAINTRUST_API_KEY
  });
 
 const response = await client.chat.completions.create({
    model: "gpt-4o-mini", 
    messages: [{ role: "user", content: "What is a proxy?" }],
    timeout: 60000 // <------------ Unsupported Param
  });

This snippet throws the following error: "Error: 400 Invalid JSON payload received. Unknown name \\"timeout\\" at 'generation_config': Cannot find field.

But the span in Braintrust is never updated. It shows no output and (no error as well)

Also in some cases, the span never ends: