The US government, citing national security authorities, has issued an export control directive to suspend all access to Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States, including foreign national Anthropic employees. The net effect of this order is that we must abruptly disable Fable 5 and Mythos 5 for all our customers to ensure compliance. Access to all other Claude models is not affected. We apologize for this disruption to our customers. We believe this is a misunderstanding and are working to restore access as soon as possible. Read our full statement: anthropic.com/news/fable-myt…

As a result of a US government directive, we are suspending access to Claude Fable 5 for all users. You can continue to use all other Claude models. Here’s what this means for you: Across Claude products, new sessions will run on your selected default model or Opus 4.8, and existing Fable 5 sessions will end with an error. On the Claude Platform, requests to Fable 5 will also return an error. Please update your integrations to other Claude models. We know this is a disruption to your workflows; we appreciate your patience and support.

Claude Fable 5 scores very well on FrontierMath: Tiers 1–4 (v2), reaching 87% on Tiers 1–3 and 88% on Tier 4. This continues a streak of Anthropic models improving rapidly at math.

Fable 5. No external assets. Three.js. dc5fzrbo8ssfx.cloudfront.net…

Claude Fable 5 (extra high) Limbo Clone:

Couldn't get enough of Claude Fable 5, so I challenged it to build a fully 3D mechanical engine platform and it just did!! 😱 And no, these aren't pre made Blender models. Nah. Fable generated everything from scratch using custom geometry, built entirely using @threejs Zero assets. One prompt. Crazzzzy results

this is purely claude fable in claude code, no other models, assets, or anything. it just threw this together with a few prompts. i'm liking it so much i might genuinely develop this into a full game

Twenty years ago, climate denial was a problem of the right. Today, AI denial is a problem of the left, and the consequences could be even more disastrous. My new video essay.

fable, I want you to grab a MetaHuman file off of Unreal Engine Marketplace or Fab Marketplace or something like that. There should be free ones. Find a character controller that works with that for web and threeJS. Specifically for flying, like Superman, generate a @theworldlabs outdoor environment of your choosing and set up a threeJS project where we can fly around with a character like Superman, with really nice flying animations, camera animations, and camera zoom and shake effects when you're flying. Put some nice post-processing on it with some bloom and grain and stuff like that. Really just make this feel as polished as you can, where we get to fly around in a world where the flight feels similar to Superman. Do it in one shot and without any input from me. optimize it 2 prompts - NOT BAD!! Honestly could get this feeling/looking 10x better with probably 2 more prompts. I'd likely use a larger city GLB, populate the outskirts with World Labs gsplats, manually grab a better character to use, and add some objectives. But I wanted to see what it could do in 1 prompt (basically) Try it out 👇

Fable 5 is genuinely cracked at indie games… Fun fact, a lot of people didn’t believe me because it looks too good to be Claude Fable However it lobotomized the original game because my browser was lagging initially, so it made slightly smaller rooms and dimmed the dynamic lighting. This is the full un-lobotomized version 💀

fable 5's been out for a couple days and i'm still processing. built this 3D garden with weather modes in @threejs no code written, no 3d assets, just a leaf texture png.

AI is advancing at a pace our policymaking institutions were never built for—and the gap between the two is becoming the central challenge of the technology. In his latest essay, our CEO Dario Amodei lays out how to close it. We're launching three new initiatives to support the efforts he outlines.

Today I'm publishing a new essay, Policy on the AI Exponential. AI is progressing extremely fast—much faster than the policy process was built to handle. The essay lays out where I think the technology is now, and the action needed to close the gap: darioamodei.com/post/policy-…

Ode to Yosemite, v2 I fed Fable replies from the thread and let it cook > weather system: drifting clouds, rainstorms, snow that accumulates over time, fog that fades as the day passes > ravens soar El Capitan, mule deer graze the meadows > pulled OpenStreetMap data: 1,244 buildings real roads, traffic at the valley's actual 25mph speed limit > synthesized rain, birdsong and crickets sounds from scratch AND it created this video completely by itself!

Science fiction authors in the order you want them to be right about AI: Iain Banks Becky Chambers Martha Wells Douglas Adams Charles Stross (Singularity Sky) Peter Watts Charles Stross (Laundry) Harlan Ellison

Claude Fable 5, 40% of Max 5x usage. Full Mario Kart 64 type game in 2 sentence prompt. All decoration and character models, 4 maps, music, all three game modes, UI was done by Fable 5 in a single shot, in about 15 mins. What the fuck. #fable #anthropic

Asked Fable to build a navigable version of Yosemite to scale > pulled satellite imagery real NASA elevation data > classified individual forest pixels and created ~266k procedural trees > custom water shaders for all 6 famous waterfalls accurate placement on cliff brinks > five times of day: dawn to night > tested itself: flew the camera around headlessly, screenshotted its own work, and fixed tree colors waterfall placement from what it saw > added snow etc. unprompted Pretty fucking impressive

this is my personal singularity moment this post may sound like a paid ad. I only wish. I'm concerned, more so than happy. the world is changing, and, among the scenarios where AI goes terribly wrong, inequality is the most realistic, yet, the one Anthropic seems to be the least concerned about. I'm glad OpenAI is taking the opposite stance: *personal AGI for everyone*. I think this is a commendable position in the times we live. but who am I in the queue of the bread? anyway, Fable is here, so I'll just report my first-hour experience first of all, all my pet prompts are solved. → λ-calculus puzzles → bug questions → one-shot apps all are trivial to it. I don't have anything harder other than my ongoing work so, in the last several days, I've been toying with HVM5, a new interaction net evaluator with a faster loop. after writing the first version, I left 32 GPT-5 agents working for ~20 hours each. this resulted in up to 2x speedups, but the file size increased by 2-fold and quality decreased significantly. I then simplified the whole thing into an even simpler core, and left Opus 4.8 and GPT 5.5 optimizing it for 8 hours. Opus got a legit 6% - 34% speedup in most benches. GPT got better results, but, sadly, an unusable file. I then asked Fable to optimize it. 2 hours later, it landed a 1770% speedup in one case, 100% in other 4, and 22% in average. yes, in 2 hours it outperformed me, opus 4.8 and a swarm of gpt 5.5 agents, by one order of magnitude. that could not possibly be legit. "it must be hardcoding the benchmarks" (GPT trauma). so I read its explanation and what it did was, indeed, the most high impact optimization one could try first. seems like HVM5 was wasting a lot of time garbage-collecting unused branches of pattern-match nodes. I had optimized that for static mats, but not for dynamic mats. skill issue. Fable figured how to do it for these, resulting in a massive speedup in some benches but wait, is that *correct*? I'm not sure yet, it is credible, but this is the kind of thing that is very easy to get wrong on interaction nets. the problem is, when I was ready to start auditing Fable's solution so I could tell whether it was buggy or legit, it interrupted me to tell me it had found a massive bug on the code *I* had written. ... wait, what? so... for garbage collection purposes, I stored a bit on lambda term pointers that meant "the variable bound by this lambda has been freed, so, its lambda must free whatever argument it is applied to". that's fine. yet, on duplicator nodes, I also used the same bit to mean "one of the duplicated variables was freed, so, treat this dup as a passthrough no-op". so, if a lambda entered a duplicator, it would mistake the lambda's collection bit for its own, resulting in corrupted interaction! that's a mouthful, why I'm writing this? just so you can appreciate the sheer absurdity of what just happened. I didn't ask it to find bugs. I asked it for an optimization. and even if I did ask it to find bugs, this bug is so astonishingly subtle and specific, identifying it takes mastering the domain to an extent that it beyond even me. I'd easily need hours or days to fix it, *if* I ever came across it. chances are it would just go unnoticed. and Fable found it and fixed it like it was nothing, while it was busy adding a 17x speedup to a file that neither I, nor Opus 4.8, nor a fleet of GPT 5.5 managed to barely make 2x faster. oh and there is also another tab where it is also ripping through Bend's codebase and finishing everything I had to do I don't know what to say anymore this isn't about Anthropic or OpenAI, this is about our collective future as a species. the world is changing, and we need to be aware of it, and discuss how to handle this change. receipt below . . .

I just got bullied by AGI

Fable: "create a visually interesting shader that can run in twigl-dot-app make it like an infinite city of neo-gothic towers partially drowned in a stormy ocean with large waves." "Make it better" All of this is procedurally generated.