83 ms·

Has anyone been able to get anything substantial done with Fable in the first place? I more or less had totally given up on using it since the alignment checks

Has anyone been able to get anything substantial done with Fable in the first place? I more or less had totally given up on using it since the alignment checks were so sensitive that it pretty much always threw me back to Opus.

planckscnst 15d ago
Yes, I used it to do a big push of my self-maintaining project All I need next is to push it through enough cycles to trust it (I have high confidence based on results so far) and then I can just setup a cron to do routine maintenance on my project
vessenes 15d ago
Combo of that, laziness and load-bearing language + the penchant for making up weird dense conceptual names pushed me to sol 5.6. They seem to indicate it is a less annoying writer in the announcement so I’m curious to try it out, though. Ironically one of their demos is speeding up inference - do us normies get to do that with Anthropic tech??
UltraSane 15d ago
I have used it to write some scripts but it is incredibly expensive.
prettyblocks 15d ago
It's probably a good model for folks doing basic software stuff, or humanities related tasks, but I work in cybersecurity on the defense/detections side and I haven't been able to use it for anything even with being in the CVP. It downgrades to Opus every time.
- ronsor 15d ago
  Fable is way too expensive for basic software stuff. Other models are more than good enough for that. In general, if Fable isn't blocking you, there's a high chance a lower tier model would work fine.
  - elevation 15d ago
    The only problems Opus struggles with, Fable won't take on. I was porting some software from Win32 to linux. Opus was running in circles. Fable was going great until it saw some authentication code and bailed.
- vablings 15d ago
  I have been running Fable with Binary Ninja MCP. It will reverse engineer a binary in a lot of detail if you give it mild direction and I haven't had it flag. I think it assumes since I have a valid binja license I must be responsible lol. I do think probably ralph looping a binary locally first is going to be best to get 100% recovery of types and function behaviors then letting a smarter model churn the final steps.
jjice 15d ago
I hear this a lot and I believe it because I've heard it from so many people, but I have never run into this in my work, and neither has anyone I know in real life. I don't use Fable for a ton of implementation work, but I use it a lot for planning, so maybe that's related to it. For planning though, I've had a very good experience with Fable and implementing with Opus.
- freedomben 15d ago
  Do your apps do anything with security? I can't hardly use Fable on our authentication service because it constantly trips up and refuses to write tests. Even just doing a security review usually triggers opus.
  - ronsor 15d ago
    I couldn't even get Fable to build my auth endpoints at all!
  - theplumber 15d ago
    I do very security cyber dangerous work like building a signup/login form or setting up a certificate. For obvious and good reasons Fable refuses to work on such sensitive stuff.
    - windexh8er 14d ago
      I asked Fable to build me a set of telemetry scripts for a specific use case so I could get a working posture of an environment. It assumed I was building some reconnaissance tooling for a nefarious reason by default and noped right out. Apparently the powers that be couldn't ever imagine their tooling being used for understanding device state. I can't wait until I need to get an exception from the USG so that I can use sudo to check some processes on a box that's spiking CPU.
- rfgplk 15d ago
  You can easily trip it up if you're doing reverse engineering work. From memory, the moment Fable 5 saw anything loosely related to "linux seccomp" it threw a fit.
richjdsmith 15d ago
Same. Both times I tried it was adamant that I can only use opus. I was reworking my company content (financial services) and it was not helpful.
germinalphrase 15d ago
For a long time, no - it was completely unusually for my work that references biological information about migratory birds/other (innocuous) seasonal phenomena. About a month or two ago, they must have tightened the black list on bio topics as it became more willing to process requests without visibly downgrading to Opus.
Avicebron 15d ago
No, almost anything related to my job is flagged for "cyber" and my company currently has no plan to try and enroll into mythos. I'm not sure if anyone has been able to enroll solo. It did help with some worldbuilding for my book (it wasn't incredible which gives me some hope for writers). So far opus 4.8 is the most reasonable model.
- codexon 15d ago
  I heard the only way you are going to get into the CVP program is if you have public CVEs. Doesn't seem to matter if you are in a company account or not according to people that are supposedly in the program.
  - Avicebron 15d ago
    Thank you, that's actually helpful. I thought it was only accessible through a b2b agreement with Anthropic.
    - codexon 15d ago
      Rumors are that if your company spends a lot, they will also remove safeguards.
exabrial 15d ago
Nope. And the lack of thought traces make it utterly useless.
malisper 15d ago
Most of the work I've done with pgrust hasn't had issues with Fable. The only time I've had issues is when building a fuzz tester to find bugs
Brendinooo 15d ago
Useless for reverse-engineering the software that talks to a ten-year-old video cam + DVR system I was given, really nice for things I actually do in my day job (web dev at an agency).
simonw 15d ago
I've used Fable for so much stuff. My experience has been that it can pretty much one-shot most of my complex problems, if I describe them clearly and provide a solid way for it to verify its work. I get punted down to Opus 5 occasionally (for security-adjacent things) but that's pretty rare.
- jaggederest 15d ago
  [dead]
vablings 15d ago
When fable first released it was almost useless. Since then, it's improved a lot. It has been working on my binary ninja MCP server just fine. It flagged for cyber 1 time (no idea why), but it generally works fine. I have noticed sometimes it likes to gaslight itself into thinking that everything its doing is allowed or allowable, I saw that it thought the game I was reverse engineering was running on a private server (it was not) so it assumed it had permission to do anything lol.
cm2187 15d ago
You don't seem to be alone: FT.com: Anthropic’s best AI model struggles to attract users as cheaper tools thrive. AI lab’s Fable 5 has met with sluggish demand from corporate clients [1] [1] https://www.ft.com/content/5ee49718-c258-4f01-aa32-7e5b76ae5245?syn-25a6b1a6=1 https://www.ft.com/content/5ee49718-c258-4f01-aa32-7e5b76ae5...
deleted 15d ago
[deleted]
rplnt 15d ago
Nope. Always failed within 2-3 prompts. The most basic REST service you can imagine. Cookies are signed, that's crypto, banned. Completely useless model.
InsideOutSanta 15d ago
In my experience, the guards are less strict than they were at first. When Fable came out, it dropped back to Opus 4.8 for about 50% of my prompts. Now it's maybe 20%.
whythismatters 15d ago
I successfully used it to re-slop Claude slop from 1+ year ago. Really puts things into perspective.

planckscnst 15d ago

Yes, I used it to do a big push of my self-maintaining project All I need next is to push it through enough cycles to trust it (I have high confidence based on results so far) and then I can just setup a cron to do routine maintenance on my project

vessenes 15d ago

Combo of that, laziness and load-bearing language + the penchant for making up weird dense conceptual names pushed me to sol 5.6. They seem to indicate it is a less annoying writer in the announcement so I’m curious to try it out, though. Ironically one of their demos is speeding up inference - do us normies get to do that with Anthropic tech??

UltraSane 15d ago

I have used it to write some scripts but it is incredibly expensive.

prettyblocks 15d ago

It's probably a good model for folks doing basic software stuff, or humanities related tasks, but I work in cybersecurity on the defense/detections side and I haven't been able to use it for anything even with being in the CVP. It downgrades to Opus every time.

ronsor 15d ago
Fable is way too expensive for basic software stuff. Other models are more than good enough for that. In general, if Fable isn't blocking you, there's a high chance a lower tier model would work fine.
- elevation 15d ago
  The only problems Opus struggles with, Fable won't take on. I was porting some software from Win32 to linux. Opus was running in circles. Fable was going great until it saw some authentication code and bailed.
vablings 15d ago
I have been running Fable with Binary Ninja MCP. It will reverse engineer a binary in a lot of detail if you give it mild direction and I haven't had it flag. I think it assumes since I have a valid binja license I must be responsible lol. I do think probably ralph looping a binary locally first is going to be best to get 100% recovery of types and function behaviors then letting a smarter model churn the final steps.

jjice 15d ago

I hear this a lot and I believe it because I've heard it from so many people, but I have never run into this in my work, and neither has anyone I know in real life. I don't use Fable for a ton of implementation work, but I use it a lot for planning, so maybe that's related to it. For planning though, I've had a very good experience with Fable and implementing with Opus.

freedomben 15d ago
Do your apps do anything with security? I can't hardly use Fable on our authentication service because it constantly trips up and refuses to write tests. Even just doing a security review usually triggers opus.
- ronsor 15d ago
  I couldn't even get Fable to build my auth endpoints at all!
- theplumber 15d ago
  I do very security cyber dangerous work like building a signup/login form or setting up a certificate. For obvious and good reasons Fable refuses to work on such sensitive stuff.
  - windexh8er 14d ago
    I asked Fable to build me a set of telemetry scripts for a specific use case so I could get a working posture of an environment. It assumed I was building some reconnaissance tooling for a nefarious reason by default and noped right out. Apparently the powers that be couldn't ever imagine their tooling being used for understanding device state. I can't wait until I need to get an exception from the USG so that I can use sudo to check some processes on a box that's spiking CPU.
rfgplk 15d ago
You can easily trip it up if you're doing reverse engineering work. From memory, the moment Fable 5 saw anything loosely related to "linux seccomp" it threw a fit.

richjdsmith 15d ago

Same. Both times I tried it was adamant that I can only use opus. I was reworking my company content (financial services) and it was not helpful.

germinalphrase 15d ago

For a long time, no - it was completely unusually for my work that references biological information about migratory birds/other (innocuous) seasonal phenomena. About a month or two ago, they must have tightened the black list on bio topics as it became more willing to process requests without visibly downgrading to Opus.

Avicebron 15d ago

No, almost anything related to my job is flagged for "cyber" and my company currently has no plan to try and enroll into mythos. I'm not sure if anyone has been able to enroll solo. It did help with some worldbuilding for my book (it wasn't incredible which gives me some hope for writers). So far opus 4.8 is the most reasonable model.

codexon 15d ago
I heard the only way you are going to get into the CVP program is if you have public CVEs. Doesn't seem to matter if you are in a company account or not according to people that are supposedly in the program.
- Avicebron 15d ago
  Thank you, that's actually helpful. I thought it was only accessible through a b2b agreement with Anthropic.
  - codexon 15d ago
    Rumors are that if your company spends a lot, they will also remove safeguards.

exabrial 15d ago

Nope. And the lack of thought traces make it utterly useless.

malisper 15d ago

Most of the work I've done with pgrust hasn't had issues with Fable. The only time I've had issues is when building a fuzz tester to find bugs

Brendinooo 15d ago

Useless for reverse-engineering the software that talks to a ten-year-old video cam + DVR system I was given, really nice for things I actually do in my day job (web dev at an agency).

simonw 15d ago

I've used Fable for so much stuff. My experience has been that it can pretty much one-shot most of my complex problems, if I describe them clearly and provide a solid way for it to verify its work. I get punted down to Opus 5 occasionally (for security-adjacent things) but that's pretty rare.

jaggederest 15d ago
[dead]

vablings 15d ago

When fable first released it was almost useless. Since then, it's improved a lot. It has been working on my binary ninja MCP server just fine. It flagged for cyber 1 time (no idea why), but it generally works fine. I have noticed sometimes it likes to gaslight itself into thinking that everything its doing is allowed or allowable, I saw that it thought the game I was reverse engineering was running on a private server (it was not) so it assumed it had permission to do anything lol.

cm2187 15d ago

You don't seem to be alone: FT.com: Anthropic’s best AI model struggles to attract users as cheaper tools thrive. AI lab’s Fable 5 has met with sluggish demand from corporate clients [1] [1] https://www.ft.com/content/5ee49718-c258-4f01-aa32-7e5b76ae5245?syn-25a6b1a6=1 https://www.ft.com/content/5ee49718-c258-4f01-aa32-7e5b76ae5...

deleted 15d ago

[deleted]

rplnt 15d ago

Nope. Always failed within 2-3 prompts. The most basic REST service you can imagine. Cookies are signed, that's crypto, banned. Completely useless model.

InsideOutSanta 15d ago

In my experience, the guards are less strict than they were at first. When Fable came out, it dropped back to Opus 4.8 for about 50% of my prompts. Now it's maybe 20%.

whythismatters 15d ago

I successfully used it to re-slop Claude slop from 1+ year ago. Really puts things into perspective.