Streaming responses dropping chunks randomly
I'm using streaming with the Chat Completions API and noticing that some chunks are being dropped, resulting in incomplete responses. This happens about 5-10% of the time.
const stream = await openai.chat.completions.create({
model: "gpt-4o",
messages: [{ role: "user", content: prompt }],
stream: true,
});let fullResponse = "";
for await (const chunk of stream) {
const content = chunk.choices[0]?.delta?.content || "";
fullResponse += content;
}
The fullResponse sometimes ends mid-sentence. Is this a known issue? Am I handling the stream incorrectly?
We're aware of this issue with function calling and malformed JSON. The recommended solution is to use Structured Outputs (response_format with json_schema) which guarantees valid JSON output.
response = client.chat.completions.create(
model="gpt-4o-2024-08-06",
messages=[...],
tools=[...],
response_format={"type": "json_schema", ...}
)
Structured Outputs were specifically designed to solve this problem.
Confirmed - switched to Structured Outputs and haven't seen a single malformed JSON response in 50K+ requests. This should be the default recommendation.
Also had this issue. Structured Outputs fixed it completely. For anyone still on the older API, adding a JSON schema in the function definition also reduces errors significantly.
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