Here are several user reports of Opus 5.5 being nerfed:
https://www.reddit.com/r/ClaudeCode/comments/1xr4urz/opus_55_in_the_past_two_weeks/
https://www.reddit.com/r/ClaudeCode/comments/1xr9x5y/the_nerf_is_real_thank_you_uwum1ha1nho/
https://www.reddit.com/r/ClaudeCode/comments/1xqvqip/anthropic_should_offer_a_free_reset_and_restore/
https://www.reddit.com/r/ClaudeCode/comments/1xr0nz5/either_a_lawsuit_an_apology_or_never_touching/
https://www.reddit.com/r/ClaudeCode/comments/1xl72og/opus_56_imminently_about_to_release/
https://www.reddit.com/r/ClaudeCode/comments/1xqtslm/rant_anthropic_stop_silently_degrading_models/
https://www.reddit.com/r/ClaudeCode/comments/1xr8jod/opus_high_55_nerfed/
https://www.reddit.com/r/ClaudeCode/comments/1xqujuh/opus_55_started_coming_up_with_unintelligible/
https://www.reddit.com/r/ClaudeCode/comments/1xqfp7m/opus_55_xhigh_just_deleted_all_my_apps_data/
https://www.reddit.com/r/ClaudeCode/comments/1xr488d/weve_been_nerfed/
https://www.reddit.com/r/ClaudeCode/comments/1xr6r3t/has_claude_been_made_dumber_again/
https://www.reddit.com/r/ClaudeCode/comments/1xr8aic/fable_opus_55_noticeable_performance_regression/
https://www.reddit.com/r/ClaudeCode/comments/1xrc97q/claude_again_ignoring_all_hooks_first_time_since/
https://www.reddit.com/r/ClaudeCode/comments/1xphsj9/opus_55_is_trying_to_destroy_my_codebase_recently/
These are all within the last week.
I have noticed the same thing myself. I am going to pause Opus 5.5 use. I find it really scummy business practice. We trust them that what is behind the string "opus-5-5" is consistent and what we signed up for. Of course behind the scenes they can do whatever they like and serve whatever model they like under that string. It is a scummy and deceptive business practice though.
Comments URL: https://news.ycombinator.com/item?id=50419019
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