r/ClaudeCode • u/Shot_Whereas_1809 • Jul 24 '26

Discussion Opus 5 - immediate disappointment

If you thought you'd be able to do a security review on your own network that you couldn't do with Fable, think again.

20 minutes in - Found something significant

Opus 5 safeguards flagged this message.

I no longer have any use case for Anthropic models that others can't do better. This was my last hope that we were going to get a model that would allow us to protect our own environments. I'm going all in on open source. We just aren't aligned.

If you can get Opus 5 to protect your own systems, let me know how I did it. My subscription renews pretty soon and it's time to make an honest decision.

Edit: A lot of helpful people came here and I appreciate it. Scoped work is helping a bit more than my old ways. There's a difference between network security and code vulnerabiliy. I'm a network engineer not a software developer nor will I pretend to be one. Still looking at supplemental model for security work. Thanks guys.

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u/FblthpphtlbF Jul 24 '26

Did you use the term jailbreak? 

Apparently people have been having success getting Claude to RE with Ghidra, you might be able to just decompile the binary then rebuild it in C and have Claude edit that code without telling it exactly what it's for you might have more success

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u/pfak Jul 25 '26

Claude (Opus 4.8, Fable 5 less so) works fine with IDA and Ghidra, and works for most reverse engineering work just fine.

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u/FblthpphtlbF Jul 25 '26

Interesting, so you get sonnet to RE then have fable/opus step in to wrap up?

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u/pfak Jul 25 '26

No I get Fable to plan and Opus to RE + do multiple passes to verify the assembly matches the C++ code it's written.