News for hackers. Stuff that matters.

A comment on Is Opus 5.5 nerfed? Thinking patterns changed on November 3. Parent comment

Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by arecurrence on Monday November 09, 2026 @01:15PM (#50429282)
This is a good point. Importantly, Claude Code updates change the system prompt and that has both direct and very broad effects on the output. Livenerf hasn't changed the Claude CLI version in 2 months.

They also have this comment in getting started: "Pin the CLI. This is not optional: a Claude Code update changes the harness, and a changed harness looks exactly like a changed model. Turn off auto-updates and write down the version you're pinning"

[ Parent | on HN ]
Re:Is Opus 5.5 nerfed? Thinking patterns changed on November 3 by pythonaut_16 on Monday November 09, 2026 @03:14PM (#50431298)
Which seems both valid and wild. Valid that if you want to compare model performance you need to limit the variables.

Wild because as an end user I don't care what Anthropic changed to affect performance, I only care that Anthropic caused degraded performance.

[ Parent | on HN ]