Startupsby GlyphWhy it ranks
How the rank works- team of 5Team size · YC's directory+4
- went through YCProgram · this site+4
- hiringHiring · Titles (titles.fru.dev), YC+2
A sum of public facts, not a judgement and not investment advice.
Competitors
| Company | Category | Status | Program |
|---|---|---|---|
| AI | Active | YCX26 | |
| Devtools | Active | YCW26 | |
| AI, Devtools | Active | YCF26 | |
| AI | Active | YCS26 | |
| Other | Active | YCW26 | |
| Other | Elsewhere |
Adjacent
| Company | Category | Status | Program |
|---|---|---|---|
| BiioShared: physical intelligenceAlchemist Class 39Not statedOther | Other | Not stated | AlchemistClass 39 |
| Other | Not stated | SPC2025 | |
| AI | Active | YCX25 | |
| Other | Active | YCS26 | |
| AI | Active | YCX26 |
Also from F26 in AI
All of F26Founders
- Chen PengFounder/CEO
- Yim YingFounder
- Liam ZhongFounder/CTO
About Runtime.si
Runtime is building a simulation-based robot policy that needs no fine-tuning or teleoperation.
- YC batch
- F26 · Fall 2026
- Status, per YC
- Active
- Category
- AI, Developer tools
- Team size
- 5
- Location
- San Francisco, CA, USA
- Checked
- 6h ago
YC tags: Robotics, Infrastructure, AI
Changes seen
Rewrote its one-liner; it read "Real-time simulation infrastructure for robots"
Rewrote its one-liner; it read "Evaluation Infrastructure for Robotics (YC F26)"
Newly tagged AI; no longer tagged Artificial Intelligence.
Renamed from Lambda Robotics.
Moved its website from lambdarobotics.ai to runtime.si.
Team went from 6 to 5 people.
Former name added: Lambda Robotics and Runtime.
Website link changed from https://lambdarobotics.ai to https://runtime.si/.
Rewrote its one-liner; it read "Robotics for AI Infrastructure"
Newly tagged Artificial Intelligence; no longer tagged AI.
Runtime.si: questions
Which YC batch was Runtime.si in?
Runtime.si was in Y Combinator's Fall 2026 batch (F26).
Is Runtime.si still active?
Y Combinator lists Runtime.si as active.
Who founded Runtime.si?
Runtime.si's founders, as listed on its YC page: Chen Peng (Founder/CEO), Yim Ying (Founder), Liam Zhong (Founder/CTO).
Where is Runtime.si based?
Runtime.si lists San Francisco, CA, USA as its location on YC's directory.