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Great to see this formalized Fable 5 is really great at refactoring / optimizing PRs, but often I want to understand why Rather than asking follow ups at $10 / $50 per million tokens, I hand these off to Cursor Composer 2.5 (5% of the cost) Recently, I asked...

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matt palmer

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21,650 Aufrufe • vor 21 Tagen •via X (Twitter)

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I compared Claude Fable 5 to GPT-5.5 in this Power Rangers prompt Thing is, Fable 5 is using Low thinking effort and GPT-5.5 is using xhigh Safe to say, the results are... not even close. 5.5's output is bad across the board, from the UI to the actual voxel scene itself🥲 1st video: Claude Fable 5 (Low effort) 2nd video: GPT-5.5 (xhigh)
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I compared Claude Fable 5 to GPT-5.5 in this Power Rangers prompt Thing is, Fable 5 is using Low thinking effort and GPT-5.5 is using xhigh Safe to say, the results are... not even close. 5.5's output is bad across the board, from the UI to the actual voxel scene itself🥲 1st video: Claude Fable 5 (Low effort) 2nd video: GPT-5.5 (xhigh)

Lentils

207,097 Aufrufe • vor 22 Tagen

GPT-5.6 vs GPT-5.5 on my custom spaceship prompt. I gave both models the exact same custom prompt. This is also the same prompt I previously gave to Fable 5. For context, GPT-5.6 Pro worked for 87 minutes, while GPT-5.5 Extra High worked for 34 minutes and 42 seconds. As I’ve said before, based on great authority GPT-5.6 will be an incremental/soldi improvement over GPT-5.5, not a “Fable killer.” My rough expectation has been that it would trade blows with Fable 5 on some benchmarks, maybe win around half depending on the category, but not clearly surpass it overall. And again fable five will have bigger model smell, but this was expected. After testing this coding output, that view feels pretty accurate. GPT-5.6 is clearly better than GPT-5.5 in several visual areas. The lighting, shading, chairs, object details, and exterior of the spaceship looked noticeably stronger. The scene was also easier to test. I do want to give GPT-5.5 credit though. It built out the rooms much much better and the planets looked better than GPT-5.6’s. It was also interesting that both GPT-5.5 and GPT-5.6 produced better-looking planets than Fable 5 in this specific test. The downside with GPT-5.5 was stability. The game was much glitchier and harder to test compared to GPT-5.6. But when it comes to the core of the demo, which is the spaceship itself, Fable 5 still beat both models pretty comfortably. GPT-5.6 is impressive, but from this test, it looks exactly like what I expected which was a meaningful incremental improvement over GPT-5.5, at least for indie game demos, but not something that replaces Fable 5. In collaboration with Chetaslua
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GPT-5.6 vs GPT-5.5 on my custom spaceship prompt. I gave both models the exact same custom prompt. This is also the same prompt I previously gave to Fable 5. For context, GPT-5.6 Pro worked for 87 minutes, while GPT-5.5 Extra High worked for 34 minutes and 42 seconds. As I’ve said before, based on great authority GPT-5.6 will be an incremental/soldi improvement over GPT-5.5, not a “Fable killer.” My rough expectation has been that it would trade blows with Fable 5 on some benchmarks, maybe win around half depending on the category, but not clearly surpass it overall. And again fable five will have bigger model smell, but this was expected. After testing this coding output, that view feels pretty accurate. GPT-5.6 is clearly better than GPT-5.5 in several visual areas. The lighting, shading, chairs, object details, and exterior of the spaceship looked noticeably stronger. The scene was also easier to test. I do want to give GPT-5.5 credit though. It built out the rooms much much better and the planets looked better than GPT-5.6’s. It was also interesting that both GPT-5.5 and GPT-5.6 produced better-looking planets than Fable 5 in this specific test. The downside with GPT-5.5 was stability. The game was much glitchier and harder to test compared to GPT-5.6. But when it comes to the core of the demo, which is the spaceship itself, Fable 5 still beat both models pretty comfortably. GPT-5.6 is impressive, but from this test, it looks exactly like what I expected which was a meaningful incremental improvement over GPT-5.5, at least for indie game demos, but not something that replaces Fable 5. In collaboration with Chetaslua

Chris

222,849 Aufrufe • vor 12 Tagen

I asked Claude Fable 5 to build a 3D map of Delhi. It cost around 1.5M tokens. It did a really good job compared to other models I have tested.
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I asked Claude Fable 5 to build a 3D map of Delhi. It cost around 1.5M tokens. It did a really good job compared to other models I have tested.

Pankaj Kumar

388,225 Aufrufe • vor 21 Tagen

Did I just unlock claude-fable-5-lite? 😂 Since Fable 5 got pulled (US export control order, Anthropic is contesting it), I wanted to see how much of its character lives in the system prompt vs. the model itself. I ran the leaked Fable 5 prompt on Opus 4.8 head-to-head against stock 4.8.
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Did I just unlock claude-fable-5-lite? 😂 Since Fable 5 got pulled (US export control order, Anthropic is contesting it), I wanted to see how much of its character lives in the system prompt vs. the model itself. I ran the leaked Fable 5 prompt on Opus 4.8 head-to-head against stock 4.8.

Jamieson O'Reilly

2,708,687 Aufrufe • vor 18 Tagen

Fable 5, I asked it to generate the coolest HTML page in the world.
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Fable 5, I asked it to generate the coolest HTML page in the world.

Onee

151,790 Aufrufe • vor 22 Tagen

The new SpaceX-Cursor model is going to be insane. It is being trained from scratch, unlike previous Composer models, which were built off Kimi. This new model is Elon’s attempt to get back in the AI race, and he might rejoin as the frontrunner. Composer 2.5 is already a world-class model, only losing to models like GPT-5.5, Opus 4.8, and Fable 5. Grok Composer 3, with SpaceX’s massive compute and xAI’s team, could become the best AI model on the planet. Elon is back.
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The new SpaceX-Cursor model is going to be insane. It is being trained from scratch, unlike previous Composer models, which were built off Kimi. This new model is Elon’s attempt to get back in the AI race, and he might rejoin as the frontrunner. Composer 2.5 is already a world-class model, only losing to models like GPT-5.5, Opus 4.8, and Fable 5. Grok Composer 3, with SpaceX’s massive compute and xAI’s team, could become the best AI model on the planet. Elon is back.

Ali Romman

118,808 Aufrufe • vor 13 Tagen

asked claude fable 5 to design a humanoid robot 2 hours and 1.4m tokens later, i got this absolutely insane
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asked claude fable 5 to design a humanoid robot 2 hours and 1.4m tokens later, i got this absolutely insane

Jake Fitzgerald

887,292 Aufrufe • vor 21 Tagen

Claude fable 5 is operating in a completely different dimension 🤯 Compared it with Claude Opus 4.8, Gemini 3.1 Pro, and GPT 5.5, the visual gap is insane. From 3D fluid dynamics to volumetric animation and complex physics, Fable 5 crushes the game. It’s not even close.
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Claude fable 5 is operating in a completely different dimension 🤯 Compared it with Claude Opus 4.8, Gemini 3.1 Pro, and GPT 5.5, the visual gap is insane. From 3D fluid dynamics to volumetric animation and complex physics, Fable 5 crushes the game. It’s not even close.

GMI Cloud

318,768 Aufrufe • vor 21 Tagen

Claude Fable 5 created this horror game with the same prompt we tested Fusion on. Do not fall for OpenRouters fraudulent marketing scheme. The capability of Fusion is NO WHERE close to that of Fable 5. Stringing together Opus 4.8, GPT 5.5, and DeepSeek V4 does not give you a better model. OpenRouter should be sued for false marketing.
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Claude Fable 5 created this horror game with the same prompt we tested Fusion on. Do not fall for OpenRouters fraudulent marketing scheme. The capability of Fusion is NO WHERE close to that of Fable 5. Stringing together Opus 4.8, GPT 5.5, and DeepSeek V4 does not give you a better model. OpenRouter should be sued for false marketing.

BridgeMind

30,848 Aufrufe • vor 16 Tagen

Designed this site in Fable 5 with just a few prompts. And no, this is not a lame post where I attach my actual (not AI) work on an AI post to get views by making fun of a launch. This is actually Fable 5, as you can clearly see (with some of the elements that scream AI generated). But man is it doing a great job!
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Designed this site in Fable 5 with just a few prompts. And no, this is not a lame post where I attach my actual (not AI) work on an AI post to get views by making fun of a launch. This is actually Fable 5, as you can clearly see (with some of the elements that scream AI generated). But man is it doing a great job!

Asaad Mahmood - The Small Square

106,760 Aufrufe • vor 21 Tagen

FREE CLAUDE FABLE 5 and almost nobody knows this trick Anthropic recently released their most capable model ever - the first Mythos-class model available to the public normally it's $10/$50 per million tokens but there's a hack: GitLab just added Fable 5 to Duo Agent Platform - across ALL tiers, including free trial the setup: 1/ register a GitLab account: 2/ start the free GitLab Duo trial 3/ Fable 5 is live through their AI Gateway 4/ done - Mythos-class model, $0 why Fable 5 is worth the hype: 1/ 80.3% SWE-Bench Pro - 11 points ahead of the next best model 2/ multi-DAY autonomous runs without losing the plot 3/ single-pass implementations of systems that took days of iteration 4/ Karpathy called it 'a major-version-bump-deserving step change' also free on Claude Pro/Max/Team until June 22 - after that it's usage credits you have a limited window to run the most capable public model on the planet for FREE
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FREE CLAUDE FABLE 5 and almost nobody knows this trick Anthropic recently released their most capable model ever - the first Mythos-class model available to the public normally it's $10/$50 per million tokens but there's a hack: GitLab just added Fable 5 to Duo Agent Platform - across ALL tiers, including free trial the setup: 1/ register a GitLab account: 2/ start the free GitLab Duo trial 3/ Fable 5 is live through their AI Gateway 4/ done - Mythos-class model, $0 why Fable 5 is worth the hype: 1/ 80.3% SWE-Bench Pro - 11 points ahead of the next best model 2/ multi-DAY autonomous runs without losing the plot 3/ single-pass implementations of systems that took days of iteration 4/ Karpathy called it 'a major-version-bump-deserving step change' also free on Claude Pro/Max/Team until June 22 - after that it's usage credits you have a limited window to run the most capable public model on the planet for FREE

kaize

23,867 Aufrufe • vor 19 Tagen

Mythos is here. It's called Fable 5. I spent the last 24 hours spending thousands of dollars in tokens to give you a realistic breakdown.
32:53

Mythos is here. It's called Fable 5. I spent the last 24 hours spending thousands of dollars in tokens to give you a realistic breakdown.

Theo - t3.gg

139,631 Aufrufe • vor 20 Tagen

Got an output from the strongest pre-release Gemini 3.5 Pro checkpoint 👀 I compared it to Claude Fable 5 and GPT-5.5 on the same exact prompt Yeah... This model is mostly dead on arrival (tried it on other prompts too ofc). It will likely be the "poor man's model" next to 3.5 flash. 1st video: Gemini 3.5 Pro (pre-release) 2nd video: GPT-5.5 3rd video: Claude Fable 5
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Got an output from the strongest pre-release Gemini 3.5 Pro checkpoint 👀 I compared it to Claude Fable 5 and GPT-5.5 on the same exact prompt Yeah... This model is mostly dead on arrival (tried it on other prompts too ofc). It will likely be the "poor man's model" next to 3.5 flash. 1st video: Gemini 3.5 Pro (pre-release) 2nd video: GPT-5.5 3rd video: Claude Fable 5

Lentils

49,846 Aufrufe • vor 22 Tagen

Claude Fable 5 has been out for a day. I already one-shotted a voxel spaceship racer with it. I fed it a reference image of a track layout and told it to build a full game around that shape. Missiles, boost zones, 3 AI opponents, 3 laps, a HUD with speed and health. Fable 5 read the image, traced the track geometry, and built the entire thing. One prompt. This is what Mythos-class models do to the build cycle.
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Claude Fable 5 has been out for a day. I already one-shotted a voxel spaceship racer with it. I fed it a reference image of a track layout and told it to build a full game around that shape. Missiles, boost zones, 3 AI opponents, 3 laps, a HUD with speed and health. Fable 5 read the image, traced the track geometry, and built the entire thing. One prompt. This is what Mythos-class models do to the build cycle.

God of Prompt

27,386 Aufrufe • vor 21 Tagen

I was a bit suspicious of the claim, but GLM-5.2 is pretty good at designing stuff. Obviously not at the level of a professional designer, but it has that Opus-level quality. Great at: - games - landing pages - HTML artifacts - 3D worlds Wish I had Fable 5 to compare with.
9:24

I was a bit suspicious of the claim, but GLM-5.2 is pretty good at designing stuff. Obviously not at the level of a professional designer, but it has that Opus-level quality. Great at: - games - landing pages - HTML artifacts - 3D worlds Wish I had Fable 5 to compare with.

elvis

16,819 Aufrufe • vor 14 Tagen

I gave 4 frontier models the same prompt to create an Ecco the Dolphin style video game 100% procedural 🐬 Same task, official chat UIs, max thinking. Watch 👇 Claude Fable 5 Z.ai GLM 5.2 ChatGPT GPT 5.5 Pro Google Gemini Flash 3.5 Note: Fable 5 version was created before the model was restricted.
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I gave 4 frontier models the same prompt to create an Ecco the Dolphin style video game 100% procedural 🐬 Same task, official chat UIs, max thinking. Watch 👇 Claude Fable 5 Z.ai GLM 5.2 ChatGPT GPT 5.5 Pro Google Gemini Flash 3.5 Note: Fable 5 version was created before the model was restricted.

Majid Manzarpour

41,967 Aufrufe • vor 10 Tagen

Claude Fable 5 made this entire video by itself. I gave it a /goal prompt, went to the gym, and came back to this. Even the sound effects. Shoutout HyperFrames
3:17

Claude Fable 5 made this entire video by itself. I gave it a /goal prompt, went to the gym, and came back to this. Even the sound effects. Shoutout HyperFrames

Nate Herk

915,313 Aufrufe • vor 19 Tagen

Dear Dario Amodei & Anthropic team, Claude with Fable 5 was the best software product I have ever used. Losing access was a gut punch - and I know I'm far from alone. I want to help bring it back, fast. At Self we've built the missing piece to make Anthropic compliant with the government's directive: a way to gate Fable 5 and Mythos 5 to verified US citizens. lets Claude users create and share a cryptographic proof of US citizenship by NFC-scanning the biometric chip in their US passport. It's privacy-preserving, independently audited, and already trusted by major companies at scale. My team is ready to work directly with yours, starting today, to wire this in. Everyone here in the US wants their Fable 5 access back. Let's give it to them. Rene
0:56

Dear Dario Amodei & Anthropic team, Claude with Fable 5 was the best software product I have ever used. Losing access was a gut punch - and I know I'm far from alone. I want to help bring it back, fast. At Self we've built the missing piece to make Anthropic compliant with the government's directive: a way to gate Fable 5 and Mythos 5 to verified US citizens. lets Claude users create and share a cryptographic proof of US citizenship by NFC-scanning the biometric chip in their US passport. It's privacy-preserving, independently audited, and already trusted by major companies at scale. My team is ready to work directly with yours, starting today, to wire this in. Everyone here in the US wants their Fable 5 access back. Let's give it to them. Rene

Rene ◘

359,213 Aufrufe • vor 17 Tagen

I asked Claude Fable 5 High to build me a "GTA 6 clone game" It costed me 1.8 million tokens to generate this open world game I guess it did a pretty good job if we compared it with other models
1:12

I asked Claude Fable 5 High to build me a "GTA 6 clone game" It costed me 1.8 million tokens to generate this open world game I guess it did a pretty good job if we compared it with other models

Karan

397,333 Aufrufe • vor 21 Tagen

built an animation template web app right before Claude Fable 5 gets taken down. the idea is simple, pick a template, upload your assets, adjust the ratio, and export. no timeline headaches. no complex settings. just the stuff you actually need. been wanting to build this for a while. wild that I finally created it in the last hours of Fable 5.
0:51

built an animation template web app right before Claude Fable 5 gets taken down. the idea is simple, pick a template, upload your assets, adjust the ratio, and export. no timeline headaches. no complex settings. just the stuff you actually need. been wanting to build this for a while. wild that I finally created it in the last hours of Fable 5.

Hey Detya

32,258 Aufrufe • vor 15 Tagen