alignment — The work of making AI systems actually pursue what their builders and users intend, rather than something subtly or dangerously different.
eval — A repeatable test for AI quality — a set of tasks plus scoring — used the way software teams use test suites, because model output is too variable to judge by eyeballing.
Why it matters
Voice benchmarks saturated in 2021, so labs now optimize for expressiveness. Knowing which proxies and reward signals shape a TTS voice explains why a model sounds flat and which evalA repeatable test for AI quality — a set of tasks plus scoring — used the way software teams use test suites, because model output is too variable to judge by eyeballing.Full definition → numbers to trust when choosing one.
