Claude Fable
One kind of Claude. Also: Opus, Sonnet, Haiku, Mythos.
A Mythos-class AI model from Anthropic, designed for complex coding and autonomous execution tasks.
What else do they all swear by?
Riley Brown, Greg Isenberg, Tom Bilyeu and 14 others use or recommend Claude Fable. See what else they have in common.
See what they all swear by Or pick your own peopleWhat creators think
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How Claude Fable compares
16 creators weighed in
Claude
Direct rival
Anthropic's text and writing AI
Fable 5 scored 91/100 on coding vs Claude's 63. Riley notes Fable costs about 2.5x more and has a far larger context window.
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12 creators
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12 creators
Fable 5 scored 91/100 on coding vs Claude's 63. Riley notes Fable costs about 2.5x more and has a far larger context window.
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"I still can't believe 5.1 was earlier this week. I feel like Alex and I are at least $100,000 into it already. How did that — I've had just thousands and thousands of pages come out of it and it's only been a week. 5.1 is really pleasant..."
Compared to Fable 5 Opus which was 'terrible to talk to'; also compared to GPT-6 Astra
"Fable 5.1 has really given me this extra tool that works at the cost and speed of Opus 5, but gives you the delegation power of Fable that used to be pretty out of reach unless you're willing to spend a ton of money."
Compared to Claude Opus 5 (slower, more tokens, worse writing, darker tone), Claude Sonnet 5 (worse writing), and ChatGPT GPT-5.6 (still preferred for minimal day-to-day writing, but Fable 5.1 now competitive)
"Whenever I'm trying to make a difficult decision, like what paid offer should I launch, what project should I stop working on, and what should I focus on for the next 3 months, I like to consult Claude Fable first. And that's because I t..."
Compared to ChatGPT for planning; ChatGPT missed a critical ops gap that Claude Fable identified
"I want to see what Fable 5 can do, because that's the best right now in my opinion. I personally would choose Fable 5 because that's the one that just will do the most work and it will work the longest to get you the output that you real..."
Compared against Route LLM output; outputs looked similar but Fable 5 preferred for demanding tasks
"I've played with Fable a little bit. Some of the stuff that I've seen other people do with it from a game world generation standpoint are startling in terms of how fast you can output stuff."
Team finds Opus so good at C++ they don't see big difference yet
ChatGPT
Direct rival
OpenAI's conversational AI chatbot
Peter says Fable took the crown back from GPT. Jason says Fable agreed with him on a bug others argued away for 9 months.
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9 creators
Peter says Fable took the crown back from GPT. Jason says Fable agreed with him on a bug others argued away for 9 months.
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"I started accidentally using Fable 5.1 just because it got turned on. The first time I've had a partner for building, for coding, that just is great. Before Fable 5.1, any of these models since the start of the year could solve a simple ..."
Compared to all previous models since start of year which could only solve simple bugs; compared to GPT Astra; described as like working with an S-tier CTO
"We're using Claude Code, and we're using Fable 5.1, which is the best model in the world as of September 3rd. Fable is much smarter than me at programming, or probably in everything. And so if I give it all the things I want it to fix, i..."
Compared to GPT-6 which is rumored to release soon; described as the best as of September 3rd
"For this game, I actually started in Claude using Fable, but that's only because I didn't have access to Astra for the first day. So you can pretty much do this in Astra and ChatGPT. The big drawback of Claude is that it doesn't have an ..."
Switched to ChatGPT/Astra because Claude lacks an image model, resulting in emoji-based graphics rather than proper game art
"Fable is a wonderful model. I think that's probably the best visual taste right now. It's very slow. That's why I don't use it for demos. If I need pure taste, it's Fable and the Anthropic models in general."
Slower than GPT-5.5 and Cursor's Composer; used when taste matters more than speed
"Fable is in a class of its own. I built a Daytona alternative — spinning up your own sandboxes on a bare metal server. I built a multiplayer Vice City game. I ported Eve so it can fully run on Convex. This is something I could have done ..."
GPT-5.6 Soul is described as much better than Opus 4.8 and 5.5 but not a Fable competitor; GPT-6 is expected to compete with Fable
Replit Agent 4 is built on top of Claude; Chris chose Claude over Claude Code due to terminal complexity
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1 creator
Replit Agent 4 is built on top of Claude; Chris chose Claude over Claude Code due to terminal complexity
"I'm using Fable 5, which is their strongest model. It's also their most expensive model, but I'm a token maxer at my core. I'm using Claude to generate prompts for Replit, create Facebook ads, write Reddit posts, and manage my entire wor..."
Replit Agent 4 is built on top of Claude; Chris chose Claude over Claude Code due to terminal complexity
"This is Claude Code running Fable 5, and it's fully controlling Figma — wait, no, not Figma. This is actually the agent native version of Figma called Paper. I really genuinely use these tools a lot, especially for thumbnails and Instagr..."
Controls Paper (agent-native canvas) rather than Figma directly
Which version
Each new Fable replaces the last.
12 creators didn't say which. Their quotes are labeled with when they said it, so you can tell which was out at the time.
What creators say
"We're using Claude Code, and we're using Fable 5.1, which is the best model in the world as of September 3rd. Fable is much smarter than me at programming, or probably in everything. And so if I give it all the things I want it to fix, it'll actua..."
More from Riley Brown →+5 more mentions from Riley
"I think Fable was kind of the first time where I felt like, oh wow, the frontier is going to be hidden behind closed doors."
"It's very likely that Fable 5.5 will be the same price as Fable 5.1, and so that will be about 2.5 times more expensive than Opus 5.5."
"You can access Fable 5.5 now, sometimes with Fable 5.1, and it literally generates entire video games out of the box. Like I generated one with 21 bosses, 15 different biomes, end to end. It's just a top-notch game that our QA testers, agents, tri..."
More from Emad Mostaque →+1 more mention from Emad
"I still can't believe 5.1 was earlier this week. I feel like Alex and I are at least $100,000 into it already. How did that — I've had just thousan..."
"We had Fable 5.1 launched last week and these are sick models. I made this Battle of Waterloo 3D historical reproduction that's historically accurate with a single prompt and it just ran for like 4 hours and then I got that. That's crazy."
More from Dan Shipper →+1 more mention from Dan
"Fable 5.1 has really given me this extra tool that works at the cost and speed of Opus 5, but gives you the delegation power of Fable that used to ..."
"I started accidentally using Fable 5.1 just because it got turned on. The first time I've had a partner for building, for coding, that just is great. Before Fable 5.1, any of these models since the start of the year could solve a simple bug. But I..."
More from Jason Lemkin →
"For this game, I actually started in Claude using Fable, but that's only because I didn't have access to Astra for the first day. So you can pretty much do this in Astra and ChatGPT. The big drawback of Claude is that it doesn't have an image mode..."
More from Peter Yang →+3 more mentions from Peter
"Whenever I'm trying to make a difficult decision, like what paid offer should I launch, what project should I stop working on, and what should I fo..."
"If you can afford both subscription plans, I would think of Fable as my planner, my architect, and my designer, and GPT as my engineer and my daily..."
"I'm using Fable 5, which is their strongest model. It's also their most expensive model, but I'm a token maxer at my core. I'm using Claude to generate prompts for Replit, create Facebook ads, write Reddit posts, and manage my entire workflow."
More from Chris Koerner →+2 more mentions from Chris
"I'm using Fable 5 to type a Reddit post for me that I can post in the Latter-day Saints subreddit about what I've built."
"I want to see what Fable 5 can do, because that's the best right now in my opinion. I personally would choose Fable 5 because that's the one that j..."
"Once I was done, I fed it into Fable and said, 'How could this be better?' It gave me a narrative suggestion that was actually pretty good. I probably accepted 80% of it. Then I said, 'Go through every word in this presentation and make suggestion..."
More from Ian Rogers →"Fable is a wonderful model. I think that's probably the best visual taste right now. It's very slow. That's why I don't use it for demos. If I need pure taste, it's Fable and the Anthropic models in general."
More from Stephen Haney →
"A month ago, to fine-tune these things required some huge engineering effort that required AI experts. Now with Fable 5, it's just a prompt."
More from Dave Blundin →
"Fable is in a class of its own. I built a Daytona alternative — spinning up your own sandboxes on a bare metal server. I built a multiplayer Vice City game. I ported Eve so it can fully run on Convex. This is something I could have done but it wou..."
More from Ras Mic →"With Fable — I sent a text message to Greg like two weeks ago and I was like, 'Dude, what's Fable?' just before it got banned. Then it came back and the last couple of days I've been obsessed and having a lot of fun and catching up."
More from Jonathan Courtney →"I was asking Fable to make some Magic: The Gathering decks for me over the weekend, and I kept hitting my limits."
More from Baiju Bhatt →
"I've played with Fable a little bit. Some of the stuff that I've seen other people do with it from a game world generation standpoint are startling in terms of how fast you can output stuff."
More from Tom Bilyeu →+1 more mention from Tom
"Claude's controversial Fable Five model got shut down by the US government over security concerns."
"I've been using Fable for about a week now and I love it. It's my favorite model ever. It feels like a big shift. Stuff that I wanted to work suddenly started working and with Fable it's very good at doing that."
More from Kieran Klaassen →"I think it's really impressive. There's a 10 percentage point improvement on key benchmarks. I ran it through its phases. I had it analyze three code bases last night and was using it to optimize performance and it did phenomenally well. It's fund..."
More from Tomasz Tunguz →
"I made this entire thing in a single prompt with Fable 5, the new model from Anthropic. It's just genuinely the most powerful coding model I've ever used by far. Fable scored a 91 on this benchmark. 91 out of 100. That's the same score as a human ..."
More from Every →
"Assuming that Fable is live, using Fable to actually code it up."
More from Greg Isenberg →+1 more mention from Greg
"This is the most powerful model that we've ever seen... I needed to make this episode where I break down how you're using Fable 5 wrong, what are a..."
"Fable did slightly worse at this... Opus did slightly better than Fable."
More from Mike Taylor →
"You used Fable from Anthropic to solve a 370-year-old cipher. 370-year-old cipher, what is this?"
More from Joe Lonsdale →
"They are saying that they outperformed every other model on their bench, including Opus 5.5, Fable, and Astra."
More from Claire Vo →
"Anthropic launch Claude Fable 5.1 alongside the restricted Claude Mythos 5.1. Fable 5.1 scoring 66 on the artificial intelligence index — the highest result ever on the index."
More from John Coogan →+2 more mentions from John
"Fable has been freed. Fable 5 is now available. Good news for the AI world."
"Lots of cool demos, many powered by Fable 5. I've seen some GPT5 stuff as well where people try and go and see the classic like Pelican on a bicycl..."
"There's so many people who will say to me, my goodness, if we had Fable 5, I would have thought the world would be totally different. And it's not."
More from Tyler Cowen →"There are people at the company who use Fable to look up the weather. That's this whole thing where people know and get in the abstract that models are amazing and great at doing tasks, but you need accounting teams to be able to monitor this."
More from Eric Glyman →"If they can be differentiated competitively by shipping faster by using Fable and just like spamming Fable the whole time, they're going to do that."
More from Everett Randle →"Fable has been rolled back and GPT-5.6 is trying to navigate these new approval hoops. So we now have a Chinese open-weight model that is as good as the currently available models from OpenAI and Anthropic."
More from David Sacks →"Anthropic launched Claude Fable on Monday. Unbelievable reviews. I actually had a founder on this morning who said it was the ultimate game changer for them. Unparalleled. US government bans it by Thursday."
More from Harry Stebbings →"Anthropic released a mythos level model with some interesting guardrails. The model's called Fable 5. No idea why they're calling it that or released on Tuesday and it tops every benchmark nearly every benchmark."
More from Jason Calacanis →
"Fable 5 is the same underlying model as Mythos, but with added safeguards. You can 10x your test suite, autooptimize code, run giant research projects"
More from Peter Diamandis →
"Claude Fable 5 is out. Bunch of feedback coming in. People on X having have had access to the model for a while now. Crushes a benchmark."
More from TBPN →"Fable 5 claimed there was going to be hundreds of thousands of vulnerabilities suffering an AI cybersecurity apocalypse. But so far what we've seen — there are definitely vulnerabilities out there, but lesser models and open-source models are able..."
"I use Fable every day and I use its competitors every day. And I will say the strongest models — the models that are strongest at revenue per token value maxing — are just still terribly weak at modeling the visual dynamics of the world."
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