Unverified50% confidenceFactExact time
Under the Messages protocol, DeepSeek V4.1 Flash 1017 requests without an effort level set do not return a thinking block, and the effort level must be set explicitly.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/19/2026
First Seen
Valid until: 1/17/2027
Sources
Related Entities
Related Claims
UnverifiedDeepSeek V4.1 Flash 1017 still consumes about 25 reasoning tokens when reasoning_effort is set to none, so it is not a true non-thinking mode.76% similarUnverifiedDeepSeek V4.1 Flash offers two reasoning levels, Hide and Max, with the Max mode's thinking process being excessively lengthy.67% similarUnverifiedThe DeepSeek API offers three effort levels—low, high (default) and max—which the V4.1 Flash paper maps to internal effort values of 50, 75 and 100, and reports that going from high to max lengthens agent trajectories by 1.6–1.8 times while yielding only marginal gains.66% similarUnverifiedThe release information for DeepSeek V4.1 Flash (1017) only gives a "leading" conclusion and does not disclose key parameters such as model size, context length or license agreement.66% similarUnverifiedDeepSeek V4 Pro为Flash版本引入了灵活的推理努力（reasoning effort）选项，并新增对OpenAI Responses API的支持66% similar
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