Cosine

Fully Agentic SWE

3.9Score#171 of 999 agents#9 of 40 in Software engineer

Why it ranks #171

Cosine, an AI software engineer from YC W23, ranks #171 of 999 AI agents and #9 of 40 in Software engineer, with a score of 3.9 of 10. Data as of 3 Oct 2026.

The score adds four parts, each 0 to 10, by weight. Every point comes from public evidence. How scoring works ·

Proof 0 × 30% 0.0
Scale 4 × 30% 1.2
Momentum 6 × 25% 1.5
Autonomy 8 × 15% 1.2
= 3.9

Proof
Do customers use it? 30% of the score
0
No public claims of customers or revenue yet.
Not found: revenue or growth (+4), named customers (+3), a customer result (+2), a customer count (+2), work done at scale (+2)
Scale
Is there a real company behind it? 30% of the score
4
12 people.
- +4
  12 people on its YC page10 to 19 people
Not found: funding round in its news (+3)
Momentum
Is it shipping and growing now? 25% of the score
6
Shows a recent launch and hiring.
- +3
  Launched in the last 6 monthsCosine 3.0 - one coding agent across every surface your team usesLaunch YC post · 16 Apr 2026
- +3
  Hiring: 5 open rolesSoftware Engineer, Cloud Infrastructure, Senior Platform Engineer, Senior Infrastructure EngineerYC page
Not found: new traction claim in the last 6 months (+2), funding news in the last year (+2), a batch in the last year (it is YC Winter 2023) (+1)
Autonomy
How much of the job does it do on its own? 15% of the score
8
Autonomous worker: completes whole tasks; people handle exceptions.
- +8
  Level 3 of 4: Autonomous workerCompletes whole tasks; people handle exceptions.
What the model read
- Acts in other systems: 83% likely
- Finishes whole tasks: 72% likely
- Calls itself an agent: 96% likely
Level 3: Completes whole tasks; people handle exceptions.