3 root causes for Gemini 2.5 Flash error thinking_level not supported
Ever run into a Thinking level is not supported for this model error when calling gemini-2.5-flash, even though it works perfectly for gemini-3-flash-preview? This is due to a design change Google made to Gemini API parameters during its generational upgrade. In this post, we'll do a systematic breakdown of the fundamental differences in thinking mode…
