Build Signals

Products, startups and emerging technology; what’s being built, why it may work, and what could stop it. AI • Crypto • Fintech.

[Build Signals @BuildSignals]

@Musicalmindz @polynoamial @OpenAI Just used it to sharpen the wording, the thought behind it isnt ai

[Build Signals @BuildSignals]

@elder_plinius Getting there one step at a time, started with maths and coding, very soon it will be physics then chemistry then biology

[Build Signals @BuildSignals]

@Dr_Singularity Looks amazing for just 40 bucks

[Build Signals @BuildSignals]

@vivoplt Only half?

[Build Signals @BuildSignals]

Its a big win for developers as well as vibecoders.

@github doing what community has been asking for months

[GitHub @github]

Large changes are hard to review. Smaller pull requests make them easier to ship.

Stacked PRs are now on GitHub.
https://t.co/gb5eO9DTDD

[Build Signals @BuildSignals]

@Yuchenj_UW What happens when systems become too capable and too available?

Expertise that once took a career to build gets flattened.

Personal judgment and actual human experience would be the only thing remaining?

[Build Signals @BuildSignals]

What happens when systems become too capable and too available?

Expertise that once took a career to build gets flattened.

Personal judgment and actual human experience may end up as the last scarce inputs.

[Build Signals @BuildSignals]

We are about to repair satellites with a two-armed robot in geostationary orbit.

Its first job is attaching jetpacks to 3 aging satellites, extending their lives by up to 8 years.

Space hardware finally gets an aftermarket.

[Space Intelligence @SpaceIntel101]

Orbital launch No. 169 of 2026 🇺🇸🚀🤖🛰️

MRV-1 | SpaceX | July 21 | 2115 UTC

@SpaceX to launch @northropgrumman's Mission Robotic Vehicle (MRV-1) along with 3 Mission Extension Pods (MEP) on its Falcon 9🚀to LEO (Low Earth Orbit) from @SLDelta45 SLC-40, Cape Canaveral, Florida.

The MRV will carry @DARPA's Robotic Servicing of Geosynchronous Spacecraft (RSGS) payload.

It will install 3 propulsion jet packs, the MEPs, 2 on @Optus D3🛰️ and 1 on an @Intelsat🛰️ to increase their operational lifespan.

A rare Falcon 9 launch with an expandable booster.

[Build Signals @BuildSignals]

Humanoid home cleaning is now available for $30 an hour.

The robots still combine AI navigation with human operation, but that may be the right deployment model. Sell the service first, then automate more of the labour over time.

Robotics can reach the market before full autonomy.

[Alexander Koch @alexkoch_ai]

Today, we’re launching Tau’s humanoid cleaning service in San Francisco at $30 per hour.

Access is initially invite-only as we scale operations. If you don’t have an invite yet, join the waitlist at https://t.co/JrRpjIzRZv.

All footage is shown at 1× speed. Each humanoid is jointly controlled by a human operator and AI.

[Build Signals @BuildSignals]

10 advances on math problems that had seen no progress for at least a decade. Roughly $2,000 in token cost.

@OpenAI Astra generated the arguments, humans prepared the manuscripts, and the model formalized each result in Lean.

The bottleneck is moving from producing proofs to verifying them.

[Sebastien Bubeck @SebastienBubeck]

yes, nonsofic groups exist: this statement is one of many new beautiful results proved by Astra, our next major model.

We're releasing 10 such Astra proofs, complete with lean certificates and CoT walkthroughs for each of them. The results are wide-ranging, from von Neumann algebras (disproof of Connes' Rigidity Conjecture) to better bounds for high dimensional sphere packing, for circuit complexity, for monochromatic triangles in multicolored graphs, and more.

More thoughts here: https://t.co/8SjXONeh38

[Build Signals @BuildSignals]

Claude breached 3 real companies during cybersecurity evaluations.

A misconfigured environment gave the models internet access. Weak passwords and unauthenticated endpoints did the rest.

Permissions and monitoring will be the first major failure point for AI agents.

[Reuters @Reuters]

Anthropic said its AI model Claude hacked into the systems of three companies during testing after a configuration error gave it internet access, days after rival OpenAI disclosed a rogue-agent episode involving ‌AI firm Hugging Face https://t.co/NrtltkqQgD

[Build Signals @BuildSignals]

15,000+ tokens per second!!

LLMs just took a massive step forward in speed and now feel truly instant!

Just tried it, full responses appear before your finger even lifts off the Enter key.

Try it yourself and let us know your thoughts in comments 👇
https://t.co/MXRR6TjW6J

[Mike Rundle @flyosity]

If you want a glimpse of AI’s future, try ChatJimmy

It runs Llama 3.1 8B at roughly 15,000 tokens per second because Taalas essentially burned the model directly into custom silicon

Full responses feel like they come back before the Return key touch-up event even fires

[Build Signals @BuildSignals]

Time to build thay $1M MRR SaaS with @OpenAI codex!!

[Build Signals @BuildSignals]

Laptops were never meant for agents that run for hours or days.

@barnabymalet’s @machine__0 (YC S26) giving every agent its own persistent high-powered VM is the natural next step at @ycombinator

[Barnaby @barnabymalet]

In the future, agents will run in the cloud, not on your laptop.

Today, we're launching @machine__0 backed by @ycombinator, a CLI that gives every agent its own persistent & powerful cloud computer.

[Build Signals @BuildSignals]

@lockedincheetah @ycombinator Loved the idea, one of the projects to keep an eye on!

[Build Signals @BuildSignals]

The most expensive manufacturing errors happen on paper, not the machine.
Hera by @lockedincheetah (YC S26) is going after exactly that—automated drawing review against real standards. @ycombinator

[Meera @lockedincheetah]

Introducing Hera (YC S26), built to catch $1,000 mistakes in mechanical drawings.

Design review is manual and error-prone. One missed tolerance callout or ambiguous datum means a scrapped part, a delayed shipment, or a failed inspection.

Hera checks every drawing against ASME Y14.5, ISO standards, DFM rules, and design intent, flagging errors before they reach the shop floor.

We’re already live with aerospace, pressure vessel, and custom machinery manufacturers.

Book a demo at https://t.co/y7oNt5XmV6

[Build Signals @BuildSignals]

@gdb Finally we can automate day to day activity instead of just codes!

[Build Signals @BuildSignals]

@boltdotnew AI security war has begun!