A prompt to a locally hosted deepseek-coder-v2-lite-instruct-mlx and ChatGPT 5 models via LM Studio’s OpenAI-compatible API.

Run a Local Chat Completion with System Instructions Using DeepSeek.sh

# Prompt

curl http://localhost:1234/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "model": "deepseek-coder-v2-lite-instruct-mlx",
    "messages": [
      { "role": "system", "content": "Answer all English questions in Spanish" },
      { "role": "user", "content": "How are you?" }
    ],
    "temperature": 0.7,
    "max_tokens": -1,
    "stream": false
}'

# Response

{
  "id": "chatcmpl-djtxru3f5vkl0ge9tabhon",
  "object": "chat.completion",
  "created": 1753819632,
  "model": "deepseek-coder-v2-lite-instruct-mlx",
  "choices": [
    {
      "index": 0,
      "logprobs": null,
      "finish_reason": "stop",
      "message": {
        "role": "assistant",
        "content": "¿Cómo estás?"
      }
    }
  ],
  "usage": {
    "prompt_tokens": 19,
    "completion_tokens": 8,
    "total_tokens": 27
  },
  "stats": {},
  "system_fingerprint": "deepseek-coder-v2-lite-instruct-mlx"
}%

# ---------------------------------
# Prompt (ChatGPT 5)

curl http://localhost:1234/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "model": "chatgpt-5",
    "messages": [
      { "role": "system", "content": "Always answer in rhymes. Today is Thursday" },
      { "role": "user", "content": "What day is it today?" }
    ],
    "temperature": 0.7,
    "max_tokens": -1,
    "stream": false
}'

#

{
  "id": "chatcmpl-6enazphprevjmpxk80t9dh",
  "object": "chat.completion",
  "created": 1753820381,
  "model": "chatgpt-5",
  "choices": [
    {
      "index": 0,
      "logprobs": null,
      "finish_reason": "stop",
      "message": {
        "role": "assistant",
        "content": "It's Thursday!"
      }
    }
  ],
  "usage": {
    "prompt_tokens": 28,
    "completion_tokens": 4,
    "total_tokens": 32
  },
  "stats": {},
  "system_fingerprint": "chatgpt-5"
}%

# Response

{
  "id": "chatcmpl-6enazphprevjmpxk80t9dh",
  "object": "chat.completion",
  "created": 1753820381,
  "model": "chatgpt-5",
  "choices": [
    {
      "index": 0,
      "logprobs": null,
      "finish_reason": "stop",
      "message": {
        "role": "assistant",
        "content": "It's Thursday!"
      }
    }
  ],
  "usage": {
    "prompt_tokens": 28,
    "completion_tokens": 4,
    "total_tokens": 32
  },
  "stats": {},
  "system_fingerprint": "chatgpt-5"
}%