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Claude Fable 5.2 Just Changed Everything

TheAIGRID | November 12, 2026



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0:00 Intro
0:51 What Claude Fable 5.2 actually is
3:27 The benchmarks
5:39 It built an operating system
7:49 What the early testers are saying
11:11 It designs real hardware
12:41 It’s solving open problems in physics
14:30 Fermat’s Last Theorem in 30 hours
15:52 Biology and materials science
17:20 Mythos 5.2 is a cyber monster
18:58 Robots and games
22:08 The price war just got real
23:17 Is this actually AGI?
25:59 The one ability Anthropic held back
28:35 My honest take

🎥 Video clips courtesy of: Anthropic / Claude (Introducing Claude Fable 5.2, voice-assistant hub, therapy capsid, operating system demo), Every, Arena, How I AI (Claire Vo), @TokenGremlin, @_sholtodouglas, Scale Labs, Artificial Analysis

🐦 Posts featured: @claudeai, @cgtwts, @ValsAI, @arcprize, @EpochAIResearch, @synthwavedd (leo), @theviclaw (victor), @AndrewCurran_, @alexalbert__, @TokenGremlin, @_sholtodouglas, @ScaleAILabs, @chehendriksen, @emollick, @eliebakouch

📺 My video on Anthropic’s Model 4 and the METR report: https://www.youtube.com/watch?v=7eQree8FhKI

📰 Sources
1. Introducing Claude Fable 5.2 and Claude Mythos 5.2 (Anthropic): https://www.anthropic.com/claude-fable-and-mythos-5-2
2. Anthropic releases new Mythos and Fable models amid RSI concerns (TechCrunch): https://techcrunch.com/2026/11/09/anthropic-releases-new-mythos-and-fable-models-amid-rsi-concerns/
3. Fable 5.2 and Jagged AGI (Ethan Mollick, One Useful Thing): https://www.oneusefulthing.org/p/fable-52-and-jagged-agi
4. Anthropic’s Claude Fable 5.2 finishes a 23-year-old black hole calculation (Crypto Briefing): https://cryptobriefing.com/claude-fable-black-hole-calculation/
5. Anthropic Launches Claude Fable 5.2 and Mythos 5.2 (MacRumors): https://www.macrumors.com/2026/11/09/anthropic-launches-claude-fable-5-2/
6. Introducing Claude Fable 5.2 (Claude): https://www.youtube.com/watch?v=6a1QSJlsYpU
7. Claude Fable 5.2 designs a working voice-assistant hub (Claude): https://www.youtube.com/watch?v=vdYynH177h0
8. Claude Mythos 5.2 predicts the structure of a therapy capsid (Claude): https://www.youtube.com/watch?v=FMbXUxn_nBw
9. We Tested Fable 5.2 Early. It’s a BEAST. (Every): https://www.youtube.com/watch?v=GHSXnRIbLw4
10. Fable 5.2 | First Impressions (Arena): https://www.youtube.com/watch?v=QwaU4yU0PdQ
11. I was a Claude hater. Fable 5.2 changed my mind. (How I AI): https://www.youtube.com/watch?v=1gYQc4CL_oo

#AI #Claude #Anthropic #Fable52 #Mythos #AGI #ARCAGI

Written by TheAIGRID

Comments

This post currently has 45 comments.

  1. @audikool

    November 12, 2026 at 4:28 pm

    Stupid question, but are you saying people are using Fable 5.2 on the Claude Chat to handle long winded projects, or is this a Claude code use of F5.2? Non coder here, just skeptical of how people are making games and solving impossible physics problems just with chat.

  2. @kanetsb

    November 12, 2026 at 4:28 pm

    2:40 It's not cheaper. It runs for a super long time, internally reasoning for ages, spits out some results, which are a lot larger etc – the end result, per task, lands at 33%-100% more expensive than Opus 5.5. That's on high reasoning Fable 5.2. If you even look at the higher reasonings, it'll just eat the entire credit you have. Sure, the results are nicer but… om nom nom nom…

  3. @drewr2007

    November 12, 2026 at 4:28 pm

    Fable 5.2 writes some of the worst copy I've seen all year! It seems too busy trying to complete tasks, optimised for completion it has no concept of nuance. I think we're reaching peak generalisation soon where model's will need to be trained of narrow functions.

  4. @bizwitmemes

    November 12, 2026 at 4:28 pm

    Anthropic might price above the $70–78 range after that first-day demand — the models keep getting better while the IPO price keeps climbing. At what point does the hype stop justifying the valuation?

  5. @rosasilva6858

    November 12, 2026 at 4:28 pm

    I wonder when AI will be integrated into robots, enabling them to perform physical tasks such as building houses, doing household chores, working in agriculture, and more. That would be a real challenge and really cool!

  6. @Fastlan3

    November 12, 2026 at 4:28 pm

    Claude Fable 5.2 registers a 59% hallucination rate.
    ​Gemini 4 Carbon sits at 11% (second only to Gemini 4 Argon's 4%).
    ​By comparison, other frontier models like Claude Opus 5.5 (Max) and GPT-6 Astra (Max) hover around 50%.

  7. @jeremiahshaw4879

    November 12, 2026 at 4:28 pm

    I prompted mine to do all of these things MONTHS ago….seems like they are really going behind the curve….not very future forward at all….I have had all of my agents doing these things for a long time….if this is new to you, you are WAY behind what AI can be doing…..pretty much, this is a joke….

  8. @ibilal123

    November 12, 2026 at 4:28 pm

    I am thinking seriously about the future, What to do next for us and our kinds. Which field to choose and stay relevant for long. AI hardware and software combinations are getting more and more efficient and traditional methods of teaching/ learning are getting obsolete. Once, knowledge of some field had been a matter of pride, now has become a set of parameters for LLM and we are looking at the pace of replacement by AI…

  9. @area51xi

    November 12, 2026 at 4:28 pm

    As a neurosurgeon and a neuroscientist, any video on AI that suggests that the latest Claude model is AGI I stop watching immediately. You lose all credibility. I only got 48 seconds into this video and stopped as I know there’s nothing further to see here.

  10. @mihaildraganov1045

    November 12, 2026 at 4:28 pm

    2:30 "Smarter, faster and cheaper at the same time and yet Anthropic still says that for everyday tasks you should use Opus. Which tells you exactly what kind of model this is" …
    Yes it does. And I would be as excited as you if not for the timing – Anthropic are struggling for money and are just about to go public. And just now they release a "God-tier model" for cheap but they beg you to not use it as a cheap model…Why? Because it bleeds money and they can't afford any of it. I know I may be a little pessimistic but this looks to be just an IPO hype before the launch. I'm not buying any of it.

  11. @thebusinessanalystguy62

    November 12, 2026 at 4:28 pm

    Is it so difficult to understand the difference between AGI and ASI? every time there is dumb people using AGI loosly. This development might well be considered ASI but not AGI it cannot perform any activity a human could but surpass us (but other models already do) in specific areas.

  12. @danielmuller2695

    November 12, 2026 at 4:28 pm

    In mid 2027 the models are potent enough to acclerate every part. So they should slow down there. Work that needs years will be done in couple of weeks/days.

    Next TPU will be completly designed by googles AI. Not need to push further, just because AI could.

    Google will soon take the lead in the race

  13. @Eric-ue5ed

    November 12, 2026 at 4:28 pm

    Hardly. ChatGPT Astra outdoes Fable 5.2 on careful modeling tasks. Astra gets much more accurate detail on very complex reconstructions of Meshy and Tripo models and the parent 2D images that created those Meshy/Tripo models. Fable 5.2 does great coding on ultra complex and large software engineering, but still requires Astra review to fix its mistakes.

  14. @wunderlichdrive

    November 12, 2026 at 4:28 pm

    I tried it out yesterday to assist me in developing a whitepaper on Human-Centered AI. I took a bunch of my notes and set it loose on the task, not expecting much. But it was incredibly impressive how well it was able to come up with both some original thinking and do its own research. It pointed out areas, where not enough data existed or where it doesn't know something. It created some strong analogies and created a 40 page document that was a shockingly good first draft. It was way beyond what I would have gotten from a different model.

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