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Fable 5 is not fable 5 anymore - they lifted export controls after adding new classifiers - added new safeguards. - and now the routine coding/debugging falls back to Opus 4.8

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331,574 views • 8 days ago •via X (Twitter)

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Claude Fable 5 is our first generally available Mythos-class model. It ships with new safety classifiers that may flag certain prompts in dual-use domains like cyber and bio. We've added fallbacks: a refused request retries on Claude Opus 4.8 instead of dead-ending.
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Claude Fable 5 is our first generally available Mythos-class model. It ships with new safety classifiers that may flag certain prompts in dual-use domains like cyber and bio. We've added fallbacks: a refused request retries on Claude Opus 4.8 instead of dead-ending.

ClaudeDevs

462,213 views • 29 days ago

Fable 5, first Mythos-class model is live on AI/ML API! We ran a fun test: Opus 4.8 vs Fable 5 are generating a 3D Pokemon. Verdict? Fable 5 is brilliant, fast, and rare as Mew… but Opus is still that nice little guy who does great stuff. 💛 Fable 5 Important bits: SOTA on nearly every benchmark, and the lead only grows on longer, complex tasks. • 1M Context • $10 / 1M input • $50 / 1M output Built for: long-horizon agentic coding, big migrations, vision-to-code, deep research.
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Fable 5, first Mythos-class model is live on AI/ML API! We ran a fun test: Opus 4.8 vs Fable 5 are generating a 3D Pokemon. Verdict? Fable 5 is brilliant, fast, and rare as Mew… but Opus is still that nice little guy who does great stuff. 💛 Fable 5 Important bits: SOTA on nearly every benchmark, and the lead only grows on longer, complex tasks. • 1M Context • $10 / 1M input • $50 / 1M output Built for: long-horizon agentic coding, big migrations, vision-to-code, deep research.

AI/ML API

560,154 views • 29 days ago

🚨 JUST IN: THE US GOVERNMENT JUST SHUT DOWN CLAUDE FABLE 5 FOR THE ENTIRE WORLD > a national security export control directive. effective immediately > every foreign national on earth - including Anthropic's own engineers who built the model - is now locked out > Fable 5 launched 4 days ago > it's already being classified like a weapons system > Anthropic says it's a misunderstanding > the order doesn't care > Opus 4.8 still runs. Fable 5 and Mythos 5 are gone until further notice AI just got its first export control. it won't be the last
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🚨 JUST IN: THE US GOVERNMENT JUST SHUT DOWN CLAUDE FABLE 5 FOR THE ENTIRE WORLD > a national security export control directive. effective immediately > every foreign national on earth - including Anthropic's own engineers who built the model - is now locked out > Fable 5 launched 4 days ago > it's already being classified like a weapons system > Anthropic says it's a misunderstanding > the order doesn't care > Opus 4.8 still runs. Fable 5 and Mythos 5 are gone until further notice AI just got its first export control. it won't be the last

Mr. Buzzoni

51,235 views • 26 days ago

fable 5 is so nerfed. sometimes it feels like anthropic shipped the max version of opus 4.8. anthropic owes us an explanation.
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fable 5 is so nerfed. sometimes it feels like anthropic shipped the max version of opus 4.8. anthropic owes us an explanation.

Ninza

152,465 views • 6 days ago

Claude Fable 5 excels at scriptwriting. We just paired it with the Higgsfield MCP and the results are stunning. Here is a comparison with Opus 4.8:
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Claude Fable 5 excels at scriptwriting. We just paired it with the Higgsfield MCP and the results are stunning. Here is a comparison with Opus 4.8:

Higgsfield AI 🧩

115,382 views • 28 days ago

Sonnet 5 is here. It's worse than Opus 4.8 on nearly every benchmark... Does that mean it's useless? Absolutely not. Use it with Claude Code Dynamic Workflows! 1. /model set to Sonnet 5 2. /effort set to Ultracode 3. Any complex task will kick off a dynamic workflow This will only become more powerful when Fable is back. You'll use Fable 5 as the superintelligent advisor and Sonnet 5 as the fast and efficient implementer.
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Sonnet 5 is here. It's worse than Opus 4.8 on nearly every benchmark... Does that mean it's useless? Absolutely not. Use it with Claude Code Dynamic Workflows! 1. /model set to Sonnet 5 2. /effort set to Ultracode 3. Any complex task will kick off a dynamic workflow This will only become more powerful when Fable is back. You'll use Fable 5 as the superintelligent advisor and Sonnet 5 as the fast and efficient implementer.

Dan McAteer

446,993 views • 8 days ago

Fable 5 is back.
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Fable 5 is back.

Claude

16,773,575 views • 7 days ago

Claude Fable 5 is now supported for use in Hermes Agent via Nous Portal! The first 500 new users get one month free access to the Plus plan to try out Fable. Code in video:
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Claude Fable 5 is now supported for use in Hermes Agent via Nous Portal! The first 500 new users get one month free access to the Plus plan to try out Fable. Code in video:

Nous Research

325,177 views • 29 days ago

Wait, is Claude Opus 4.8 actually a Fable 5?? Opus generated this. A 3D botanical DNA strand. No, it's not a video or a 3D asset. It's pure math using Three.js, running at 60fps ❤️‍🔥 Everything including petals and flowers is generated using custom geometry. Also responsive. That too done from a image reference. Fable or not, Claude is generally good at 3D stuff.
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Wait, is Claude Opus 4.8 actually a Fable 5?? Opus generated this. A 3D botanical DNA strand. No, it's not a video or a 3D asset. It's pure math using Three.js, running at 60fps ❤️‍🔥 Everything including petals and flowers is generated using custom geometry. Also responsive. That too done from a image reference. Fable or not, Claude is generally good at 3D stuff.

The Bugged Dev

23,106 views • 18 days ago

Fable 5 is back. Back to one-shotting b dollar companies.
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Fable 5 is back. Back to one-shotting b dollar companies.

Kai Lentit (e/xcel)

30,947 views • 7 days ago

Fable 5 totally crushed our new contest, but it cost 6x more than Opus 4.8! We gave 4 models the same prompt: build three self-contained HTML5 canvas scenes with real physics demos Prompts: — A train derailing off a broken bridge into the water — Two cars jumping off ramps and colliding mid-air over a canyon — A monster truck crushing a row of parked cars Outputs: Fable 5: 62,158 tokens, $3.12 GPT 5.5: 37,753 tokens, $1.14 Opus 4.8: 22,280 tokens, $0.56 GLM 5.2: 36,246 tokens, $0.08 Fable 5 did all three scenes at A+. The crashes looked real, things fell and broke the right way, and nothing went through the ground or floated. GPT 5.5 was the closest to Fable. In the Bigfoot show, we think GPT was even a little better. GLM 5.2 did not win any scene, but it was the cheapest by far. Fable is the best pick for quality, but you pay more for it.
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Fable 5 totally crushed our new contest, but it cost 6x more than Opus 4.8! We gave 4 models the same prompt: build three self-contained HTML5 canvas scenes with real physics demos Prompts: — A train derailing off a broken bridge into the water — Two cars jumping off ramps and colliding mid-air over a canyon — A monster truck crushing a row of parked cars Outputs: Fable 5: 62,158 tokens, $3.12 GPT 5.5: 37,753 tokens, $1.14 Opus 4.8: 22,280 tokens, $0.56 GLM 5.2: 36,246 tokens, $0.08 Fable 5 did all three scenes at A+. The crashes looked real, things fell and broke the right way, and nothing went through the ground or floated. GPT 5.5 was the closest to Fable. In the Bigfoot show, we think GPT was even a little better. GLM 5.2 did not win any scene, but it was the cheapest by far. Fable is the best pick for quality, but you pay more for it.

atomic.chat

2,826,341 views • 7 days ago

Sonnet 5 loses to Opus 4.8 on benchmarks. But this happens when you pair them. Set Sonnet 5 as the implementer, Fable 5 as the advisor, Fast & cheap execution, frontier-level reasoning The real unlock isn't the model. It's the stack.
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Sonnet 5 loses to Opus 4.8 on benchmarks. But this happens when you pair them. Set Sonnet 5 as the implementer, Fable 5 as the advisor, Fast & cheap execution, frontier-level reasoning The real unlock isn't the model. It's the stack.

0xMarioNawfal

182,888 views • 1 day ago

Holy SHittttt Claude Fable 5 is playing Factorio on its own 🤯 factory game engineers love planning / debugging / long-horizon strategy it’s building an automated factory autonomously this is not “AI plays game” anymore....
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Holy SHittttt Claude Fable 5 is playing Factorio on its own 🤯 factory game engineers love planning / debugging / long-horizon strategy it’s building an automated factory autonomously this is not “AI plays game” anymore....

Chetaslua

128,333 views • 29 days ago

Vibe coding using Claude Fable 5 insane look what I built
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Vibe coding using Claude Fable 5 insane look what I built

Deep

243,446 views • 29 days ago

Fable 5 absolutely crushed the HTML5 physics contest, but cost 6x more than Opus 4.8 and 39× more than GLM 5.2 in that test. Test was done on atomic[.]chat, a desktop app that runs LLMs locally. The test asked 4 models to generate self-contained canvas demos with believable motion and collisions. The scenes were not simple animations because every crash needed gravity, force, timing, and contact handling. Outputs: - Fable 5: 62,158 tokens, $3.12 - GPT 5.5: 37,753 tokens, $1.14 - Opus 4.8: 22,280 tokens, $0.56 - GLM 5.2: 36,246 tokens, $0.08
0:16

Fable 5 absolutely crushed the HTML5 physics contest, but cost 6x more than Opus 4.8 and 39× more than GLM 5.2 in that test. Test was done on atomic[.]chat, a desktop app that runs LLMs locally. The test asked 4 models to generate self-contained canvas demos with believable motion and collisions. The scenes were not simple animations because every crash needed gravity, force, timing, and contact handling. Outputs: - Fable 5: 62,158 tokens, $3.12 - GPT 5.5: 37,753 tokens, $1.14 - Opus 4.8: 22,280 tokens, $0.56 - GLM 5.2: 36,246 tokens, $0.08

Rohan Paul

204,694 views • 7 days ago

Everyone is dunking on Sonnet 5 for losing to Opus 4.8 on benchmarks. They're all making the same mistake, judging a teammate by a solo test. Sonnet 5 was never built to win alone. Set the model to Sonnet 5, effort to Ultracode, and any complex task auto-kicks a dynamic workflow where it plans, spawns agents, executes and checks its own work, fast and cheap. When Fable 5 comes back, the setup gets stupid good. Fable 5 decides what to build, Sonnet 5 actually builds it. You stop paying flagship prices to do grunt work.
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Everyone is dunking on Sonnet 5 for losing to Opus 4.8 on benchmarks. They're all making the same mistake, judging a teammate by a solo test. Sonnet 5 was never built to win alone. Set the model to Sonnet 5, effort to Ultracode, and any complex task auto-kicks a dynamic workflow where it plans, spawns agents, executes and checks its own work, fast and cheap. When Fable 5 comes back, the setup gets stupid good. Fable 5 decides what to build, Sonnet 5 actually builds it. You stop paying flagship prices to do grunt work.

0xMarioNawfal

98,313 views • 7 days ago

UltraCode is running over 100 Opus 4.8 agents right now. This is the future of software development. Not 5 agents. Not 10. Over 100 working simultaneously across the entire BridgeMind ecosystem. This is what vibe coding looks like at scale. One person orchestrating a swarm of AI agents building, debugging, and shipping in parallel. We are so early.
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UltraCode is running over 100 Opus 4.8 agents right now. This is the future of software development. Not 5 agents. Not 10. Over 100 working simultaneously across the entire BridgeMind ecosystem. This is what vibe coding looks like at scale. One person orchestrating a swarm of AI agents building, debugging, and shipping in parallel. We are so early.

BridgeMind

108,267 views • 1 month ago

Warp now supports Claude Fable 5. Fable 5 has Mythos-level performance and is highly capable of /goal-oriented, unsupervised tasks. Ready to embed into your next loop 🔁
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Warp now supports Claude Fable 5. Fable 5 has Mythos-level performance and is highly capable of /goal-oriented, unsupervised tasks. Ready to embed into your next loop 🔁

Warp

17,131 views • 29 days ago

Built my version of an interactive 3D V8 engine sim with real-time procedural kinematics and RPM controls. Didn't use Fable 5, and the AI I used actually costs less than Opus.
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Built my version of an interactive 3D V8 engine sim with real-time procedural kinematics and RPM controls. Didn't use Fable 5, and the AI I used actually costs less than Opus.

Techartist

42,656 views • 26 days ago

Claude Fable 5 is now available anonymously on Venice
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Claude Fable 5 is now available anonymously on Venice

Venice

24,474,173 views • 29 days ago