Mercor
Small (~200)
OpenAI
Large (~3,500)
Best For
Mercor
Best for: Engineers who want to build AI hiring infrastructure at a $10B rocketship with extreme ownership and MIT-founder energy
OpenAI
Best for: Engineers who want to build frontier AI models at the company defining the industry, with elite compensation
Ratings
MercorOpenAI
3.9
4.5
Overall
3.9
3.6
Work-Life Balance
3.6
4.6
Culture & Values
4.0
4.5
Comp & Benefits
3.5
4.3
Senior Mgmt
3.7
4.3
Career Opps
👍 74% Recommend
👤 82% CEO Approval (Brendan Foody)
👍 90% Recommend
👤 95% CEO Approval (Sam Altman)
Culture Values
Mercor only
🤝 Flat Hierarchy
OpenAI only
🌱 Learning & Growth🎯 Direct Product Impact
Shared
🚀 Ship Fast & Iterate⚙️ Engineering-Driven💎 Strong Comp & Equity
Pros & Cons
Mercor
- Massive impact at an AI company growing at breakneck speed
- Top-tier compensation with strong equity at $10B valuation
- Intense 9/9/6 work schedule — long hours are the norm
- Work-life balance is a real sacrifice at this stage
OpenAI
- Cutting-edge frontier AI research with world-class colleagues
- Elite compensation — top-tier TC and equity packages
- High-intensity environment — long hours and intense pace are the norm
- Internal politics and rapid org changes as the company scales
Bottom Line
Mercor
Choose Mercor if you want outsized impact on AI-era hiring at a tiny, fast-moving team — but the 9/9/6 schedule is real, and work-life balance is genuinely sacrificed for speed.
OpenAI
High-intensity, mission-driven culture with world-class colleagues and top-tier comp — but expect long hours, rapid org changes, and internal politics as the company scales.
Open Roles
Mercor — 49 jobs
💻 Engineering
20
🧠 ML / AI
6
💼 Sales / GTM
5
👤 HR / People
3
📊 Data
2
📣 Marketing
2
📋 Product
2
🎨 Design
1
⚙️ Operations
1
OpenAI — 655 jobs
💻 Engineering
317
💼 Sales / GTM
57
📋 Product
30
📊 Data
28
🧠 ML / AI
28
📣 Marketing
24
⚙️ Operations
17
⚖️ Legal
13
🎨 Design
10
👤 HR / People
9
💰 Finance
7
🎧 Support
4
Summary
Mercor scores 3.9/5.0 on Glassdoor with a 3.9 work-life balance rating. OpenAI scores 4.5/5.0 overall with a 3.6 WLB. That’s a 0.6-point gap on overall satisfaction.
Both companies share these culture values: Ship Fast & Iterate, Engineering-Driven, Strong Comp & Equity. Mercor also emphasizes Flat Hierarchy. OpenAI also emphasizes Learning & Growth, Direct Product Impact.
On the hiring front, Mercor has 49 open roles and OpenAI has 655 open roles.