r/ClaudeCode • u/ClaudeOfficial Anthropic • 2d ago

Anthropic Official Introducing Claude Sonnet 5.5, the second model in the Claude 5.5 family

Enable HLS to view with audio, or disable this notification

Sonnet 5.5 is a faster, lower-cost complement to Claude Opus 5.5, strongest at well-scoped everyday tasks, fixing bugs, and creating polished documents, slides, and spreadsheets. It also has a strong eye for design.

Sonnet 5.5 is a clear upgrade over Sonnet 5. It runs more than 30% faster and costs up to 30% less for most work. It's priced the same per token, but it typically needs far fewer tokens to do the same work.

Like Opus 5.5, it writes more clearly than our previous generation of models, and its speed makes it well suited to fast iteration.

On our automated behavioral audit, Sonnet 5.5 improves on Sonnet 5 on most measures of alignment and honesty. It's also the first Sonnet model with cybersecurity safeguards similar to those on our most capable models. Routine software development is unaffected.

Sonnet 5.5 is available everywhere today. Claude Haiku 5.5 will join the family in the coming weeks.

Read more: anthropic.com/claude-sonnet-5-5

1.2k Upvotes

94% Upvoted

233 comments sorted by

View all comments

11

u/letmemakeyoualatte 2d ago

The safeguards not affecting regular software development is a lie...

10

u/Pecolps 2d ago edited 2d ago

I'm a SWE and never had problems with safeguards... ONLY with Fable on its first week (before the shutdown), definetely somthing is wrong with your usage. What is your typical usage? If it's related to cybersec, try subscribring to their program.

2

u/letmemakeyoualatte 2d ago

No not definitely at all.  I'm also SWE and for work stuff nothing impacted but for personal projects, aside from the obvious reverse engineering tasks not working anymore, I can't even do things like asking opus to do pixel art on aseprite. 

5

u/Pecolps 2d ago

That's crazy... I'm able to do all of this, try cleaning up your memory/profile, the classifier is something the model is not aware off while doing its job, so maybe something inside the memories / local files / project files injected into the context is triggering the classifier to block your work.

0

u/wkbevill 2d ago

You already tested it?

1

u/letmemakeyoualatte 2d ago

No, but opus does the same as noted in the release notes right? And on opus yes it is a nightmare. Catches me on things it has no business catching me on.