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 4.8show more

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.show more

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.show more

🚨 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 lastshow more

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

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:show more

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.show more

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.show more

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.show more

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:show more

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....show more

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, $0.08show more

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.show more

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.show more

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 🔁show more

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.show more

🤯KIMI K3 ABSOLUTELY MOGS! BEATING Opus 4.8, GPT 5.5,... and even Fable 5 in multiple benchmarks. They scored 1688 on GDPval-AA v2 🔥 This is a completely different breed of open-source models Kimi creates better games and front-end designs than Fable 5, but it's 8x cheaper! The results coming out are truly impressive! I will be testing this out further and posting multiple tests today. Stay tuned!show more

I tested Kimi K3 vs Claude Opus 4.8 Same... prompt, an armory bay with lighting, props, and detail. Top is Kimi K3, bottom is Opus 4.8. It's not even close. Kimi K3 built a full scene with textures, proper lighting, ammo crates, weapon racks, working detail everywhere. Opus 4.8 gave me a near empty room with a couple of floating tables. No doubt it beats Opus 4.8. Kimi K3 is Fable 5 level, and it's clearly better than GPT-5.6 Sol at 3D and games. An open weight model just matched the best closed models on the market. Let that sink in.show more

just sent my first prompt to Fable 5 >... it instantly routed the task to Opus 4.8 > which spawned Sonnet 5 sub agents > that burned 30% of my weekly limit > and handed me slop this thing used to build full open words and refactor entire codebases in one shot WHAT DID YOU DO ANTHROPICshow more

Fable is back (enjoy the final hours of in-sub... usage) so we made it fight Anthropic's Opus 4.8: >5 real landing page and portfolio briefs, built in Claude Code, >judged blind by 9 working designers across 90 matchups. Fable's best brief won 88.9% of its head-to-heads. Its worst output only won 11.1%. The difference was the brief 🧵show more

Very excited to announce: Riley's Lovable (Built with Fable... in 5 Prompts) Now builds mobile apps and web apps with Fable 5 The app can > Build and preview web apps > Build and preview mobile apps > Edit apps > Sandboxes that come alive when open project (shut down after 60 min of inactivity) > Database and auth > Voice to textshow more