this post was submitted on 21 Feb 2026
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It heavily depends on the frontend. Most cheat, and actually pre-process "simple" prompts and redirect them to non-thinking models, even if you select "thinking." It also doesn't also help that most frontends are jank af and have removed the thinking button.
Kimi happened to be the best model I had access to, but even more well-known models like GPT 5 Mini crash out. Gemini and Claude in particular lie and don't actually show the full thinking, just a summarised version of it.
Sadly don't have access to "better" models to test further.
GPT 5 Mini: