Anthropic has simply introduced Fable, the beginning of a brand new household of fashions that brings lots of the capabilities of its Mythos system to the general public. As a refresher, Mythos is the state-of-the-art mannequin Anthropic debuted at first of April by way of Project Glasswing. The undertaking noticed Anthropic share entry to the mannequin with choose companions, together with Apple and NVIDIA, with the purpose of serving to these organizations harden their software program towards AI cyberattacks. Glasswing additionally prompted the White Home to rethink its policy on AI regulation. Final week, Anthropic said it was working as rapidly as potential to launch a Mythos-capable mannequin with “extremely sturdy safeguards” to the general public, and as we speak it is doing precisely that with Fable.
Anthropic says the brand new system, which begins at model 5 to align with the corporate’s different fashions, provides capabilities that “exceed” these of any it has made publicly obtainable prior to now. “The longer and extra complicated the duty, the bigger Fable 5’s lead over our different fashions,” Anthropic says. Within the firm’s personal testing, Fable beat not solely its earlier flagship providing, Opus 4.8, but in addition GPT-5.5 and Gemini 3.1 Pro from rivals OpenAI and Google. Anthropic provides Fable is especially adept at duties like software program engineering, drug design and doc evaluation, but in addition excels in domains the place the corporate’s previous fashions have usually underperformed. Imaginative and prescient is one such space.
https://www.youtube.com/watch?v=CIQBP1w4B1M
Chances are you’ll recall final yr Anthropic streamed Claude attempting (and failing) to beat Pokémon Red. The mannequin Anthropic used for that Twitch sequence, 3.7 Sonnet, required an overlay to permit Claude to make sense of the sport’s pixel artwork interface and world. In case you watched the stream carefully, you’ll have observed every time Claude moved the sport’s protagonist it needed to reevaluate their place afterward. Between frames, Claude was primarily blind, and it could not “hear” when the participant character hit an impediment like a tree. Against this, Fable can beat FireRed, the 2004 Sport Boy Advance remake, with a “minimal, vision-only harness.” In follow, the corporate says Fable’s new capabilities translate to a mannequin that may “extract exact numbers from detailed scientific figures and might carry out complicated vision-based duties like rebuilding an internet app’s supply code from screenshots alone.”
As for these safeguards I discussed earlier, Claude will mechanically route prompts on some matters by way of the less-capable Opus 4.8. “To launch [Fable 5] each safely and rapidly, we have tuned these safeguards conservatively — they will typically catch innocent requests, although they set off, on common, in lower than 5 % of periods,” the corporate mentioned. “With extra succesful fashions arriving within the coming months, we’re working to enhance our safeguards and cut back false positives as rapidly as we will.”
On Tuesday, Anthropic additionally launched Mythos 5, which runs on the identical underlying mannequin as Fable 5 however comes with fewer safeguards. The corporate will initially supply Mythos 5 by way of Undertaking Glasswing earlier than making it extra extensively obtainable by way of a trusted entry program. Claude subscribers can strive Fable 5 till June 22. Thereafter, utilizing Fable 5 will cost usage credits, which Anthropic has priced at $10 per million enter tokens and $50 per million output tokens. “After this level — when adequate capability permits us to take action — we purpose to revive Fable 5 as a typical a part of subscription plans. We intend to do that as rapidly as we will.”
