Failed deliver reasoning in Chinese for DeepSeek

[Victsz]

reference

https://openrouter.ai/announcements/reasoning-tokens-for-thinking-models

The example works well, how ever when using Chinses as question input the output is always '\n\n'

reasoning_response.json()['choices'][0]['message']['reasoning']
# output: '\n\n' 

the example question "Which is bigger: 9.11 or 9.9?" in Chinese is "9.11和9.9哪个大？"

Meta data from activity page

Chinese

note : "native_tokens_reasoning": 2,

{
  "data": {
    "id": "gen-1738379560-QA7bKGLbRoJQjDDkkStL",
    "upstream_id": "chatcmpl-528bec048e3a41ccab1fa07c50386670",
    "total_cost": 0.00174255,
    "cache_discount": null,
    "provider_name": "DeepInfra",
    "created_at": "2025-02-01T03:14:24.047081+00:00",
    "model": "deepseek/deepseek-r1",
    "app_id": null,
    "streamed": true,
    "cancelled": false,
    "latency": 678,
    "moderation_latency": null,
    "generation_time": 102338,
    "tokens_prompt": 68,
    "tokens_completion": 926,
    "native_tokens_prompt": 45,
    "native_tokens_completion": 712,
    "native_tokens_reasoning": 2,
    "num_media_prompt": null,
    "num_media_completion": null,
    "num_search_results": null,
    "origin": "",
    "is_byok": false,
    "finish_reason": "stop",
    "native_finish_reason": "stop",
    "usage": 0.00174255
  }

English

All good

{
  "data": {
    "id": "gen-1738379159-SLN89jeib4fbptNYJyMp",
    "upstream_id": "chatcmpl-3aa2a0cd7e7844429401d48915965e65",
    "total_cost": 0.0012828,
    "cache_discount": null,
    "provider_name": "DeepInfra",
    "created_at": "2025-02-01T03:07:14.278309+00:00",
    "model": "deepseek/deepseek-r1",
    "app_id": null,
    "streamed": true,
    "cancelled": false,
    "latency": 696,
    "moderation_latency": null,
    "generation_time": 73577,
    "tokens_prompt": 44,
    "tokens_completion": 514,
    "native_tokens_prompt": 40,
    "native_tokens_completion": 522,
    "native_tokens_reasoning": 517,
    "num_media_prompt": null,
    "num_media_completion": null,
    "num_search_results": null,
    "origin": "",
    "is_byok": false,
    "finish_reason": "stop",
    "native_finish_reason": "stop",
    "usage": 0.0012828
  }
}

The bug is reproducible for any Chinese question not limited to the specific one. "人生的意义是什么？"