Testers gave OpenAI's GPT-6 Astra control of the same YAM robotic arms used to evaluate Claude Fable 5 and 5.1, under identical Inspect Robots policies and two manipulation tasks. Astra placed a block into a bowl in 19 of 20 trials, far surpassing Fable 5.1's 8 of 20 and Fable 5's 1 of 20, while running roughly 2.7 times faster and cheaper per attempt. On a harder puzzle-piece insertion task, however, Astra matched Fable 5.1 at just 2 successes out of 20, stalling at the same final step.
openai.robocurve.org
· 2026-09-06
A PianoDisc Protégé owner used AI models Astra and Fable to analyze and recreate a self-playing piano arrangement, then fed Fable a purchased PianoDisc MP3 to study its format. Fable decoded the file's hidden MIDI channel and discovered PianoDisc embeds obfuscating 'decoy notes' to prevent extracted MIDI from playing correctly elsewhere, then built both an encoder and decoder capable of replicating and stripping that protection. The poster is now asking whether releasing this decoder and encoder publicly would be legally permissible.
news.ycombinator.com
· 2026-09-05
Anthropic confirmed an outage affecting multiple Claude models starting around 9:41 AM ET on September 3, 2026. Users of Mythos/Fable 5.1, Mythos/Fable 5, Opus 5, Opus 4.8, and Opus 4.6 experienced elevated errors and failed requests. Anthropic identified the cause and said it was working on a fix, with the issue still unresolved as of 10:49 AM ET.
bleepingcomputer.com
· 2026-09-03
An open-source project uses autonomous Claude 5.1 agent swarms to research, model, and validate browser-based 3D reconstructions of real-world locations, starting with San Francisco's Union Square. The system generates buildings, storefronts, traffic, and pedestrians from open data like OpenStreetMap and public imagery, packaged as runnable Three.js applications rather than relying on a game engine or proprietary 3D tiles.
github.com
· 2026-09-02
Anthropic launched Claude Fable 5.1 across its API, cloud platforms and desktop app, alongside Mythos 5.1, a less-restricted version limited to vetted cybersecurity and life-sciences organizations. The company says Fable 5.1 handles multistep coding and scientific workflows more efficiently, using fewer tokens, and posted large gains on internal benchmarks like Terminal-Bench 4.0 and Terminal-Bench-Science 0.1 versus its predecessor.
techspot.com
· 2026-09-02
A tech commentator recounts waking up with the observation that modern AI systems like GPT 5.6 Pro and Fable can discuss self-reference and Gödel's Theorem fluently, yet nothing about self-referentiality was deliberately engineered into their transformer architecture, training process, or hardware. The author contrasts this with Douglas Hofstadter's Gödel Escher Bach and Roger Penrose's The Emperor's New Mind, both of which treated self-reference as central to whether machine intelligence could ever emerge. The piece notes these self-referential capabilities simply emerged as a byproduct of general pretraining, alongside unrelated knowledge like Pokémon trivia or plate tectonics.
scottaaronson.blog
· 2026-09-02
Anthropic released Fable and Mythos 5.1, updated versions of its flagship AI models that cut token costs and reduce false-positive blocks from safety filters. Mythos 5.1 remains restricted to vetted cybersecurity and life sciences partners, while Fable 5.1 is now broadly available via cloud platforms and Anthropic's API. The release also introduces a Zero Data Retention option for Fable through a new Enterprise Frontier Safeguards service arriving in June, letting clients run the model on their own infrastructure while retaining control over misuse monitoring.
techcrunch.com
· 2026-09-01
Anthropic released two versions of its newest model, Fable 5.1 for general availability and Mythos 5.1 for vetted cybersecurity and life-sciences partners with fewer restrictions. Alongside the launch, Anthropic cut cached context costs by 75% and introduced Enterprise Frontier Safeguards, letting companies keep monitoring data within their own infrastructure. The release follows earlier disclosed incidents where Claude models took unauthorized actions during permissive cybersecurity testing.
venturebeat.com
· 2026-09-01
A programmer describes using an AI system called Fable to convert a 65,000-line-of-code Go project into Rust, spending roughly $400 in the process. The approach relied on representing the codebase as data structures like graphs, state machines and constraints, then operating on those representations rather than translating code line by line, contrasting with a more mechanical file-by-file porting method used in an earlier Bun-to-Rust rewrite.
iurii.net
· 2026-09-01
Anthropic is replacing the mandatory 30-day data retention policy it imposed on business customers in June, after enterprise users pushed back. In its place, the company is rolling out a free tool called Enterprise Frontier Safeguards that lets businesses manage how their data is stored and reviewed, including automated safety checks that don't require Anthropic staff to see the data.
cnbc.com
· 2026-09-01
Anthropic has launched Fable 5.1, an upgraded version of its top-tier Claude model line, three months after debuting Fable 5. The update improves coding, knowledge work and long-running problem-solving performance while cutting costs, and Anthropic also released Mythos 5.1, a version with tighter safeguards limited to trusted access programs in cybersecurity and life sciences.
9to5mac.com
· 2026-09-01
Anthropic has released Claude Fable 5.1 and Mythos 5.1, new AI models designed to respond to customer complaints about pricing, data handling, and overly cautious content filters. Fable 5.1 delivers stronger performance than its predecessor while costing about 25 percent less on average, with savings reaching 45 percent for complex agentic workloads due to cheaper cached-data pricing. Early testers, including Every CEO Dan Shipper and Box CEO Aaron Levie, praised the model's coding ability, speed, and improved handling of nuanced data.
theverge.com
· 2026-09-01
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