Bob Fu 傅丰元

MiMo TTS doesn't just talk — it sounds human. Sobbing. A sudden laugh. A cough. Heavy breathing. A nervous sigh. All woven naturally into speech. 🎧 2/n

I’ve been paying close attention to the voice AI companies coming out of Y Combinator over the last couple of batches, and there’s a pretty clear split emerging between what’s actually gaining traction and what mostly feels like demo energy. The startups that seem to be growing aren’t pitching “AI that talks like a human.” They’re solving very specific operational bottlenecks. Things like outbound collections in regulated industries, multilingual support for a narrow vertical, or automating a tightly scoped workflow where voice replaces an expensive human queue. The positioning is practical. The surface area is constrained. The ROI story is obvious. They talk about latency budgets, concurrency, compliance sequencing, routing logic, integration reliability. You can tell they’ve thought about production before they’ve thought about marketing. On the other side, there’s still a lot of horizontal “voice agent for everything” energy. Beautiful demos. Broad claims. Big TAM slides. But when you listen carefully, there’s less clarity around failure handling, monitoring, cost at scale, or what happens after month three of deployment. It’s optimized for excitement, not endurance. What seems to be working in YC right now is domain compression. Narrow scope. Deep understanding of one workflow. Infrastructure to support it. Real iteration loops from production data. Less emphasis on sounding human, more emphasis on being reliable. The pattern is familiar. In every infrastructure wave, the winners aren’t the most magical — they’re the most operationally disciplined. Voice AI is starting to look the same.

Dan's side projects are doing more to advance human/agent interaction than most startups are accomplishing with full teams and millions in funding

Today we launch Fish Audio S2, a new generation of expressive TTS with absurdly controllable emotion. - open-source - sub 150ms latency - multi-speaker in one pass Real freedom of speech starts now 👇

I spent time in Shenzhen last year and when I saw Merz come back from China saying Germans need to work more I immediately knew what broke his brain because I lived the exact same cognitive shock my first week in Huaqiangbei I burned through 4 prototype iterations of a motor controller board for less than a thousand bucks total, back home a friend was working on something similar and spent over 12 thousand for a single revision that took almost two months to arrive when you live that contrast in your own hands with your own project something permanently shifts in how you see the world and it goes way deeper than speed & cost what Shenzhen actually built is a collective learning organism, imagine 20 PCB fabs 15 injection mold shops 30 component distributors and a hundred firmware freelancers all within a 2km radius, looks insanely redundant from the outside until you realize redundancy is actually information density in disguise I watched this firsthand with an injection mold supplier I was working with, this guy had seen a hundred founders iterate similar thermal designs over 6 months so he proactively modified his tooling before I even opened my mouth, he knew what I needed before I knew what I needed, the intelligence lives in the relationships between the nodes and it compounds daily the west thinks about manufacturing as a cost center you optimize by centralizing… China accidentally built a distributed neural network of manufacturing intelligence where knowledge diffuses horizontally across thousands of agents faster than any single western company can process internally so when Merz comes back and says we need to work a bit more I think he saw the problem but COMPLETELY misdiagnosed the solution, telling Germans to work harder is like telling a horse to gallop faster when the other side built a combustion engine the gap is ARCHITECTURAL it’s ecosystem density, you need a custom connector in Shenzhen you walk 200 meters, in Munich you send an email and wait 3 weeks it’s iteration speed, parallel search vs sequential optimization at the system level, it’s risk tolerance, Chinese founders ship something broken on Monday fix it Tuesday ship again Wednesday while European companies are still in the approval phase for the pilot program of the feasibility study… and Merz only saw the surface, what he missed is the tier 2 cities like Hefei Chengdu Wuhan replicating the Shenzhen model at scale right now BYD going from irrelevant to outselling every european automaker combined in roughly 5 years, Huawei building its own 7nm chip under maximum sanctions when every analyst said it was physically impossible & behind all of that a government that treats advanced manufacturing as an existential national priority while europe debates whether AI needs another ethics committee I think what we’re watching is the most asymmetric economic competition in modern history and most western leaders are still framing it as a productivity problem when it’s actually an ontological one Europe & America are optimizing variables that China stopped tracking years ago meanwhile China is compounding on dimensions the west has no framework to even measure Merz at least had the courage to name it out loud and I respect that genuinely but working a bit more inside a broken architecture just means you arrive at the wrong destination slightly faster