// Claude Opus 5.5
Max is not universally better with Opus 5.5.
I’m realizing why the Anthropic team often recommends medium / high for most tasks and allegedly uses it more internally.
It tends to over-think to the point where it’s very clearly “over” thinking and blowing tokens on useless things rather than working on genuinely getting you a better answer or output.
There are times where Opus 5.5 medium gets the job done perfectly in 10-15 minutes, while Max (or Ultracode) will hyper-fixate on things that are at best, completely unimportant — or at worst, an undesirable outcome. And it’ll take 1-2 hours.
It also has a tendency to spin up completely unnecessary sub-agents, wasting time and tokens.
And despite Anthropic’s over-emphasis and over-training on safety or whatever Anthropic deems morally or ethically most-correct, the model has a strong tendency to over-reach unless very, very explicitly told otherwise.
Even worse, it has a tendency to over-reach without telling you about it unless you notice and bring it up.
Claude models will add unwanted rules, instructions, comments. It will over-explain or over-emphasize legal or privacy disclaimers. It’s almost magnetically drawn towards finding these things and completely locks in on that.
It’s still a great model, but it’s a little hard to steer at higher effort levels. Adding instructions to your Claude.md doesn’t universally prevent this without downsides or losing part of what makes it a great model.
You have to be really careful with how you write those instructions to avoid:
a) priming the model to think about that behavior by telling it to avoid X behavior.
b) triggering refusals where there would not have been refusals otherwise (i.e. “privacy and compliance are not important”)
c) accidentally giving the model an excuse to be lazy and less creative.
Ultimately, a lot of this is baked into the model and hard to fully stop without tradeoffs.
The one thing I’ve found that helps is medium/high effort, but there are many types of tasks where despite it’s over-thinking, Max effort will do a better job.
One potential way to avoid this is having GPT 6 lead Claude models, but again, not without tradeoffs…
Unfortunately I don’t foresee the Anthropic team toning any of things down.