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litellm - 💡(How to fix) Fix [Bug]: "When using v0.21.0 to launch deepseek-v4-flashwith thinking mode enabled, the reasoning_contentfield is not returned."

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Root Cause

"messages": [
    {
      "role": "user",
      "content": "9.11 and 9.8, which is greater?"
    }
  ],
  "reasoning_effort": "medium",
  "extra_body": {
    "thinking": {
      "type": "enabled"
    }
  }。response："model": "/data/DeepSeek-V4-Flash",
	"choices": [
		{
			"index": 0,
			"message": {
				"role": "assistant",
				"content": "This is a trick question that often trips people up because of how we read numbers.\n\nWhile 9.11 is a larger *number* in terms of digits (eleven vs. eight), **9.8 is greater in value.**\n\nHere’s why:\n*   9.8 is the same as 9.80.\n*   9.80 is greater than 9.11.\n\nSo, **9.8 is greater than 9.11**.",
				"refusal": null,
				"annotations": null,
				"audio": null,
				"function_call": null,
				"tool_calls": [],
				"reasoning": null
			},
			"logprobs": null,
			"finish_reason": "stop",
			"stop_reason": null,
			"token_ids": null,
			"routed_experts": null
		}
	],
	"service_tier": null,
	"system_fingerprint": "vllm-0.21.0-dp4-ep-6873ddae",

Code Example

"messages": [
    {
      "role": "user",
      "content": "9.11 and 9.8, which is greater?"
    }
  ],
  "reasoning_effort": "medium",
  "extra_body": {
    "thinking": {
      "type": "enabled"
    }
  }。response："model": "/data/DeepSeek-V4-Flash",
	"choices": [
		{
			"index": 0,
			"message": {
				"role": "assistant",
				"content": "This is a trick question that often trips people up because of how we read numbers.\n\nWhile 9.11 is a larger *number* in terms of digits (eleven vs. eight), **9.8 is greater in value.**\n\nHere’s why:\n*   9.8 is the same as 9.80.\n*   9.80 is greater than 9.11.\n\nSo, **9.8 is greater than 9.11**.",
				"refusal": null,
				"annotations": null,
				"audio": null,
				"function_call": null,
				"tool_calls": [],
				"reasoning": null
			},
			"logprobs": null,
			"finish_reason": "stop",
			"stop_reason": null,
			"token_ids": null,
			"routed_experts": null
		}
	],
	"service_tier": null,
	"system_fingerprint": "vllm-0.21.0-dp4-ep-6873ddae",
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Check for existing issues

  • I have searched the existing issues and checked that my issue is not a duplicate.

What happened?

"I noticed this issue while comparing the behavior with the official DeepSeek API documentation."

Steps to Reproduce

"I noticed this while comparing the behavior with the official DeepSeek API documentation."

Relevant log output

"messages": [
    {
      "role": "user",
      "content": "9.11 and 9.8, which is greater?"
    }
  ],
  "reasoning_effort": "medium",
  "extra_body": {
    "thinking": {
      "type": "enabled"
    }
  }。response："model": "/data/DeepSeek-V4-Flash",
	"choices": [
		{
			"index": 0,
			"message": {
				"role": "assistant",
				"content": "This is a trick question that often trips people up because of how we read numbers.\n\nWhile 9.11 is a larger *number* in terms of digits (eleven vs. eight), **9.8 is greater in value.**\n\nHere’s why:\n*   9.8 is the same as 9.80.\n*   9.80 is greater than 9.11.\n\nSo, **9.8 is greater than 9.11**.",
				"refusal": null,
				"annotations": null,
				"audio": null,
				"function_call": null,
				"tool_calls": [],
				"reasoning": null
			},
			"logprobs": null,
			"finish_reason": "stop",
			"stop_reason": null,
			"token_ids": null,
			"routed_experts": null
		}
	],
	"service_tier": null,
	"system_fingerprint": "vllm-0.21.0-dp4-ep-6873ddae",

What part of LiteLLM is this about?

Docs

What LiteLLM version are you on ?

v1.53.1

Twitter / LinkedIn details

No response

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