In streaming output mode, the `content` in delta is missing from the second to last data

[WangxuP]

Git commit

git checkout -b b4667

Operating systems

Linux

GGML backends

CUDA

Problem description & steps to reproduce

In streaming output mode, the content in delta is missing from the second to last data, which can cause some third-party applications to make errors when calling it. The data style is as follows:

data: {"choices":[{"finish_reason":null,"index":0,"delta":{"content":""}}],"created":1738980577,"id":"zhp","model":"DeepSeek-R1-UD-IQ1_M","system_fingerprint":"b0-unknown","object":"chat.completion.chunk"}

data: {"choices":[{"finish_reason":"stop","index":0,"delta":{}}],"created":1738980577,"id":"hp","model":"DeepSeek-R1-UD-IQ1_M","system_fingerprint":"b0-unknown","object":"chat.completion.chunk","usage":{"completion_tokens":206,"prompt_tokens":12,"total_tokens":218},"timings":{"prompt_n":10,"prompt_ms":970.0,"prompt_per_token_ms":97.0,"prompt_per_second":10.309278350515463,"predicted_n":206,"predicted_ms":25605.215,"predicted_per_token_ms":124.29716019417477,"predicted_per_second":8.045236097412188}}

data: [DONE]

First Bad Commit

No response

Compile command

cmake -B build -DGGML_CUDA=ON
cmake --build build --config Release -j96

Relevant log output

no log

[ngxson]

Not a valid bug, see #11747 (comment)