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> Opus 5’s safeguards match those of Claude Fable 5’s, with one change: it now permits source-code vulnerability discovery at all access levels. This means that

by not_a9 3mo ago

> Opus 5’s safeguards match those of Claude Fable 5’s, with one change: it now permits source-code vulnerability discovery at all access levels. This means that the model can support defensive cybersecurity work while still blocking vulnerability discovery in compiled binaries, which is more commonly used offensively. Okay so it’s worse than Opus 4.8 for my purposes I guess?

sebzim4500 3mo ago
Presumably it drops back to 4.8 in those cases so it's not really worse
- tyre 3mo ago
  yes. At the bottom of the release post it says that they are releasing two new features, one of which is customizing fallback behavior instead of blocking for restricted models
- bobbylarrybobby 3mo ago
  If it switches mid conversation, this is a massive increase in token consumption because it has to re-read your conversation into cache, right?
yukIttEft 3mo ago
What are your purposes?
- not_a9 3mo ago
  Reversing for the most part, though lately I’ve been doing some code obfuscation/binary rewriting stuff. Fable will switch to Opus instantly on these and I’m unsure how this will perform. I suppose the only way to find out is to test.
  - jaggederest 3mo ago
    I am very excited for a future where all software is by default modifiable, even shipped binaries, via patches or trampolining, or trickery I don't even know the name of.
    - derac 3mo ago
      It's essentially here, I've had success with gpt-5.6 and Ghidra MCP
  - roboyoshi 3mo ago
    It's rather broad right now. I started reverse engineering a mac app and it started reading some binary data and then quickly told me to switch to Opus 4.8 to continue, because the guardrails kicked in.
  - ciefa 3mo ago
    Try GPT 5.6 Sol if you haven't yet. I recently created a patch for Riftborne via static IL patching and Fable 5 outright kept refusing to do it, no issue whatsoever with GPT 5.6 Sol lol.
dannyw 3mo ago
I don't think there's been any official confirmation, but even Fable safeguards seem to have gotten quite a bit of tuning, is less trigger-happy and less like regex matching.

by not_a9 3mo ago

sebzim4500 3mo ago

Presumably it drops back to 4.8 in those cases so it's not really worse

tyre 3mo ago
yes. At the bottom of the release post it says that they are releasing two new features, one of which is customizing fallback behavior instead of blocking for restricted models
bobbylarrybobby 3mo ago
If it switches mid conversation, this is a massive increase in token consumption because it has to re-read your conversation into cache, right?

yukIttEft 3mo ago

What are your purposes?

not_a9 3mo ago
Reversing for the most part, though lately I’ve been doing some code obfuscation/binary rewriting stuff. Fable will switch to Opus instantly on these and I’m unsure how this will perform. I suppose the only way to find out is to test.
- jaggederest 3mo ago
  I am very excited for a future where all software is by default modifiable, even shipped binaries, via patches or trampolining, or trickery I don't even know the name of.
  - derac 3mo ago
    It's essentially here, I've had success with gpt-5.6 and Ghidra MCP
- roboyoshi 3mo ago
  It's rather broad right now. I started reverse engineering a mac app and it started reading some binary data and then quickly told me to switch to Opus 4.8 to continue, because the guardrails kicked in.
- ciefa 3mo ago
  Try GPT 5.6 Sol if you haven't yet. I recently created a patch for Riftborne via static IL patching and Fable 5 outright kept refusing to do it, no issue whatsoever with GPT 5.6 Sol lol.

dannyw 3mo ago

I don't think there's been any official confirmation, but even Fable safeguards seem to have gotten quite a bit of tuning, is less trigger-happy and less like regex matching.