Claude Opus 5.5 users are advised to abandon old prompts
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Anthropic advises Claude Opus 5.5 users to abandon outdated prompt habits, such as 'think hard', as the model can now adapt to reasoning depth. These words are ineffective and affect response speed. Anthropic recommends starting from the 'Medium' effort level, as internal tests show that the performance of this level is comparable to Opus 5's 'High' level, and higher settings do not necessarily yield better results. Anthropic states that Claude Opus 5.5 is now set to default on the Pro, Max, Ultra, and Team plans, unlike its predecessor models, many users still use outdated prompts to slow it down. Anthropic's tests show that removing these phrases results in faster response times and no measurable drop in quality.
AI-written from the reports · Updated 44 minutes ago
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- The DecoderAnthropic suggests Claude Opus 5.5 users abandon outdated prompt habits
Anthropic suggests users of Claude Opus 5.5 discard outdated prompt habits, such as 'think hard', as the model can already adapt to reasoning depth, these words are ineffective and affect response speed. Anthropic recommends starting from the 'Medium' effort level, as internal tests show that the performance level is comparable to Opus 5's 'High' level, and higher settings do not necessarily yield better results.
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