DeepSeek (OpenAIError: missing finish_reason for choice 0)

[Kenix157]

Confirm this is a Node library issue and not an underlying OpenAI API issue

• This is an issue with the Node library

Describe the bug

I testing DeepSeek models (V3 & R1) using nebius studio (https://api.studio.nebius.ai/v1/)
this error outputs at end (output in stream works)
max_tokens 2048

err OpenAIError: missing finish_reason for choice 0
at (/Users/ilavolkov/Dev/heybro-backend/node_modules/openai/src/lib/ChatCompletionStream.ts:618:17)
at Array.map ()
at finalizeChatCompletion (/Users/ilavolkov/Dev/heybro-backend/node_modules/openai/src/lib/ChatCompletionStream.ts:615:22)
at ChatCompletionStream._ChatCompletionStream_endRequest (/Users/ilavolkov/Dev/heybro-backend/node_modules/openai/src/lib/ChatCompletionStream.ts:365:12)
at ChatCompletionStream._createChatCompletion (/Users/ilavolkov/Dev/heybro-backend/node_modules/openai/src/lib/ChatCompletionStream.ts:392:52)
at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
at ChatCompletionStream._runChatCompletion (/Users/ilavolkov/Dev/heybro-backend/node_modules/openai/src/lib/AbstractChatCompletionRunner.ts:266:12)

To Reproduce

let options: ChatCompletionStreamParams = {
model: deepseek-ai/DeepSeek-R1,
"messages":[{"role":"system","content":"Ты ИИ-ассистент, который помогает людям находить информацию. Размышления выводи в специальный "},{"role":"user","content":[{"type":"text","text":"Где лучше жить в Рф?"}]}],
stream: true,
stream_options: {
include_usage: true,
},
};

try {
return await this.client.beta.chat.completions.stream(options, {
timeout: 1000 * 60 * 2,
stream: true
});
} catch (err) {
this.logger.error('Request to deepSeek failed', err);
throw err;
}

// call code

for await (const chunk of stream!) {
console.log('chunk w data', JSON.stringify(chunk))
}

const usageInfo = await stream?.totalUsage();
console.log('usageInfo', usageInfo);

Code snippets

OS

macOS

Node version

v21.7.3

Library version

openai 4.81.0