Fable 5 Is Now Available on Filot
Anthropic's newest frontier model, Fable 5, is now available on Filot on an opt-in basis. In our internal evaluations, it delivers a 12% improvement on complex financial modeling, measured on accuracy, comprehensiveness, and instruction adherence.
Today we're making Fable 5, Anthropic's newest frontier model, available on Filot. It's offered on an opt-in basis: nothing changes for your team unless you choose to enable it.
Built for Long-Horizon Work
Complex financial modeling is a long chain of dependent steps, where an error early on compounds through everything downstream. Fable 5 is built for exactly this. In our testing it works 20–30% longer on a task, and that extra time shows up as a markedly more comprehensive result. Filot already ties out every KPI and segment breakout against its validation controls; with Fable 5, that thoroughness comes with even greater consistency — conventions set at the start of a task are still honored hundreds of steps later, and every datapoint ties to its source.
Measured on Our Workflows
We benchmarked Fable 5 on our internal evaluation suite for long-running financial work: tasks like three-statement modeling, DCF and LBO builds, and other complex financial services workflows. Fable 5 and Gemini 3.5 were the strongest frontier models we tested, with Fable 5 delivering a 12% improvement in financial modeling, measured on accuracy, comprehensiveness, and instruction adherence.
Opt-In by Design
Fable 5 is offered as an opt-in option for organizations that want it. It's disabled by default; workspace administrators can enable it from settings, and individual analysts can then select it per workflow. Your existing configuration continues to work exactly as before.
One note on data handling: Anthropic has configured its retention policy slightly differently for this model. Data processed by Mythos-class models is retained for 30 days for trust and safety purposes, with no training on your data — which is why we offer Fable 5 on a customer-elected basis.
"A 12% improvement on financial modeling is the largest single-generation gain we've measured. Where it matters most is Custom Workflows: Fable 5 stays with a task until it's genuinely done, so firms can run their own modeling processes end to end and get results back polished and tied out." — Bjorn Birkelund, Co-Founder of Filot
Want Fable 5 turned on for your firm? Your Filot contact can get you set up.
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