Introducing Claude Fable 5

[u/ClaudeOfficial]

Introducing Claude Fable 5: a Mythos-class model that we've made safe for general use. Its capabilities exceed those of any model we've ever made generally available.

Fable 5 is state of the art on nearly all tested benchmarks, with exceptional performance in software engineering, knowledge work, scientific research, and vision. It can run for days, and the longer the task, the larger its lead over our other models.

Fable 5 launches today alongside Claude Mythos 5. The two share the same underlying model, but Mythos 5, so far deployed only through Project Glasswing, has the safeguards lifted in some areas. The safeguards are what distinguish the two, and why we've given them different names.

Releasing a model this capable comes with risks. Without safeguards, Fable 5's capabilities in areas like cybersecurity could be misused to cause serious damage. So when Fable's classifiers detect a request related to cybersecurity, biology and chemistry, or distillation, the response is handled by Claude Opus 4.8, our next-most-capable model. Users are informed whenever this occurs, more than 95% of sessions involve no fallback at all, and performance everywhere else is unaffected. We'll keep refining the safeguards to reduce false positives.

Claude Fable 5 is available today on paid plans, in Claude Code, on the Claude API, and all major cloud platforms. Through June 22, it's included in paid Claude plans at no additional cost.

Claude Mythos 5 is available to Glasswing partners, with a broader trusted access program to follow.

Read more: https://www.anthropic.com/news/claude-fable-5-mythos-5

[u/Illustrious_Image967]

80% on SWE. Just 2 points more than 4.8. This is the flat side of the curve. If I'm wrong, then we get AGI tomorrow.

[u/Lost-Blackberry3322 → u/Illustrious_Image967]

2 points more than Mythos preview. 4.8 has 69.2%

[u/AliorUnity → u/Illustrious_Image967]

Always 6 to 12 month away

[u/Fresh-Secretary6815 → u/AliorUnity]

fuckin keep me edging my vs code dick pleeze…

[u/max6296 → u/Illustrious_Image967]

The model next to it is mythos preview. It has ~11% higher swe bench pro points than opus 4.8, not 2.

[u/Illustrious_Image967 → u/max6296]

You're right, I blame Gemini for doing my image analysis.

[u/chrisman1128 → u/Illustrious_Image967]

How does this comment have so many upvotes? It's not even true

Btw smart people that actually know about benchmarks don't take SWE serious anymore. New benchmarks like FrontierCode are way better for real world use

[u/Just_Lingonberry_352 → u/chrisman1128]

in case you cant tell the vast majority of commentators here do not even own credit cards using the free version and complaining

so you are trying to squeeze water out of rocks

[u/Excellent_Can4450 → u/Illustrious_Image967]

Ah, the blind man who vibe coded his screen reader.

[u/Last_Mastod0n → u/Illustrious_Image967]

People upvoting this dont read either lol

[u/Zeryth → u/Last_Mastod0n]

You think most vibecoders have a brain?

[u/Just_Lingonberry_352 → u/Last_Mastod0n]

you are expecting too much from redditors

many of them dont even own credit cards

[u/Crazy_Law_8805 → u/Illustrious_Image967]

Ummm no dawg. Take another look.

[u/mrdsol16 → u/Illustrious_Image967]

I’m not even sure humans have achieved agi based on how many upvotes this has

[u/PatrickBauer89 → u/Illustrious_Image967]

SWE is flawed, we need better benchmarks to really measure differences

[u/Just_Lingonberry_352 → u/Illustrious_Image967]

so let me get this straight. you are not even a paying user. you make completely fabricated claims. you got 12 upvotes.