Channel: Theo - t3․gg
Fable is Mythos, and it is really good.
The Signal
A new model release, dubbed Fable 5, is being touted by users as an exceptionally capable coding and design assistant that outperforms existing benchmarks, yet it remains hemmed in by severe token costs, silent safety routing, and a controversial 30-day data retention policy that complicates privacy-sensitive deployment.
The Case
- Users report Fable 5, a guarded version of the Mythos 5 base model, produces higher-quality, merge-worthy code than previous models but often requires iterative repairs and multi-turn feedback to resolve complex tasks like library migrations.
- The model is not natively consistent; it silently routes sensitive queries regarding cybersecurity or chemistry to Anthropic's Opus 4.8, which speakers argue undermines the reliability of the model’s stated benchmark results.
- Usage economics are aggressive: one single complex refactoring workflow reportedly consumed $100 in just eight minutes, highlighting an extreme burn rate that could quickly exhaust the platform's multi-plan subscription limits.
- All Fable 5 traffic is subject to a 30-day retention policy, which the speaker notes effectively removes the 'trusted setup' privacy expectation for enterprise users and may violate specific internal corporate compliance rules.
- Speakers claim that safety interventions and prompt modifications for frontier-model development tasks occur without clear disclosure, turning the product into a 'dumber' variant depending on the user's specific prompt topic.
- While benchmark scores on platforms like sbench pro show the model significantly outperforming older baselines, these results are frequently distorted by refusals, fallback behaviors, and the varying quality of the benchmarks themselves.
The 1 Minute Signal Take
This video is a high-density, hands-on diagnostic that cuts through the marketing noise to reveal the friction points of modern AI development. Skip it if you are already familiar with the model’s specs, but watch it if you need a clear-eyed accounting of the silent routing and retention costs that will actually hit your team's budget and compliance workflows.
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Channel: Theo - t3․gg