After its June launch as Anthropic's top widely available model, Claude Fable 5 hit U.S. export limits and returned July 1 with stricter safety classifiers. Those rules now shunt more prompts—especially in sensitive areas—straight to the older Opus 4.8, which explains the measured collapse on BridgeBench debugging tasks from 86.2 percent down to 25.9 percent.
The Great Anthropic Bait And Switch.
Keep sending them your money!
FABLE 5 CAME BACK NERFED.
We re-ran the July 1st version of Claude Fable 5 on BridgeBench.
The results are brutal:
Debugging: 86.2 → 25.9 Refactoring: 73.6 → 38.4 Hallucination: 75.9 → 61.7
The new guardrails are kicking in on way too many tasks and falling back to Opus 4.8.
This is not the model that got banned.
Anthropic owes everyone an explanation.
Developers running bug diagnosis or code repair on TypeScript now see frequent hand-offs to the weaker model and explicit notifications when it happens. Early launch claims of fallback in under 5 percent of sessions no longer match current user reports.
Anthropic has said the post-redeployment classifiers will be tuned further, yet no dates or target trigger rates have been released. How quickly the original benchmark numbers might return therefore remains an open variable for teams counting on Fable 5.
Many users slammed Anthropic for adding strict guardrails that nerfed Claude Fable 5, calling the changes lobotomizing, quota-burning, and an insane scam that tanked benchmarks and usefulness.
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Claude Feeble 5 😮💨
Fable 5 isn't nerfed, it's SLAUGHTERED.
the problem isn't even the model itself, but the hard guardrails Anthropic has set in place.
Fable 5 isn't nerfed, it's SLAUGHTERED.
the problem isn't even the model itself, but the hard guardrails Anthropic has set in place.
FABLE 5 CAME BACK NERFED.
We re-ran the July 1st version of Claude Fable 5 on BridgeBench.
The results are brutal:
Debugging: 86.2 → 25.9 Refactoring: 73.6 → 38.4 Hallucination: 75.9 → 61.7
The new guardrails are kicking in on way too many tasks and falling back to Opus 4.8.
This is not the model that got banned.
Anthropic owes everyone an explanation.
ouch!
Fable 5 isn't nerfed, it's SLAUGHTERED.
the problem isn't even the model itself, but the hard guardrails Anthropic has set in place.
Maybe they didn't tell it to make all the efforts
FABLE 5 CAME BACK NERFED.
We re-ran the July 1st version of Claude Fable 5 on BridgeBench.
The results are brutal:
Debugging: 86.2 → 25.9 Refactoring: 73.6 → 38.4 Hallucination: 75.9 → 61.7
The new guardrails are kicking in on way too many tasks and falling back to Opus 4.8.
This is not the model that got banned.
Anthropic owes everyone an explanation.
@Hesamation Anthropic's safety guardrails worked so incredibly well, Fable 5 forgot how to debug entirely.
@Hesamation Blame the government they are the ones who forced anthropic to put those guardrails 😒
@beffjezos Tbh it still feels a notch above Opus 4.8.
@Hesamation Rip claude. Let give Chinese people chance
@SquidTakopi @Hesamation If I pick fabel in the model picker and it gives me the results based on those scores shown above it doesn't really matter if they're "Opus" scores. The reality is I just got a much shittier product
@navigateny @r2d2beeps @omnimaster1385 @Hesamation Yeah, they picked Anthropic out of nowhere to restrict first. There has been absolutely no fault in Anthropic(!)
@Hesamation Daario's rheoteric did that.
@omnimaster1385 @Hesamation No.
@EricPedersen81 @Hesamation I would hope so, competition ends up making the products better.
Although for now, xAI/SpaceX seems to be mainly succeeding in providing compute to Google and Anthropic rather than winning on their own. Grok is really behind
@tunguz Imagine a world where Anthropic never fearmongered the government with claims of a nation-state hacker.
Mythos would be available to everyone, maybe with only cyber behind approval. GPT Sol would be released already. Nearly a month of drama would be saved.
@Hesamation All this fake AI news. Fable works just fine. I haven't noticed any refusals or reroutes to opus
@Hesamation It's very simple to avoid...
@omnimaster1385 @Hesamation No, I'll blame Anthropic for forcing USG to act with their fear-based marketing. Companies are responsible for their actions. You can't get away with saying your model is a super-duper weapon.
@beffjezos Fumble 5 🤣🤣🤣🤣🙈
@Hesamation The feel is totally off, benchmarks aside. Still has capability but it’s not quite as open as before
@Hesamation And it consumes 60% more tokens than before. Insane scam.
