AI Training Pay Rates Compared: Mercor vs Braintrust vs Scale AI in 2026
AI Training Pay Rates Compared: Mercor vs Braintrust vs Scale AI in 2026
Choosing the right AI training platform can mean the difference between earning $30/hr and $150/hr for similar work. Mercor, Braintrust, and Scale AI are three of the most prominent platforms hiring AI trainers, but they differ significantly in pay rates, project types, and overall experience. Here's a data-driven comparison to help you decide where to invest your time.
Quick Comparison
| Factor | Mercor | Braintrust | Scale AI |
|---|---|---|---|
| Pay Range | $25-250/hr | $60-200/hr | $15-100/hr |
| Platform Fees | Taken from client side | 0% to contractors | Taken from client side |
| Vetting Process | AI interview + assessments | Application review | Online test + onboarding |
| Payment Frequency | Weekly | Bi-weekly/monthly | Weekly/bi-weekly |
| Work Availability | High (30K+ contractors) | Moderate | Very high |
| Best For | Domain experts, engineers | Senior professionals | Volume workers, beginners |
Pay Rates by Role
Software Engineering
| Experience | Mercor | Braintrust | Scale AI |
|---|---|---|---|
| Junior (1-3 yrs) | $40-80/hr | $60-90/hr | $25-50/hr |
| Mid-Level (3-6 yrs) | $80-130/hr | $90-140/hr | $40-75/hr |
| Senior (6+ yrs) | $130-200/hr | $140-200/hr | $60-100/hr |
Winner: Tie between Mercor and Braintrust. Both platforms pay significantly more than Scale AI for engineering work. Braintrust's zero-fee model means you keep every dollar, while Mercor's higher volume means more available hours.
RLHF and Data Training
| Task Type | Mercor | Braintrust | Scale AI |
|---|---|---|---|
| Response comparison | $25-60/hr | $60-100/hr | $15-40/hr |
| Expert evaluation | $50-150/hr | $80-150/hr | $30-80/hr |
| Content generation | $30-70/hr | $70-120/hr | $20-50/hr |
Winner: Braintrust for per-hour rates. Scale AI for sheer volume of available tasks, making it easier to find consistent work even at lower rates.
Domain Expert Work
| Domain | Mercor | Braintrust | Scale AI |
|---|---|---|---|
| Medical/Healthcare | $100-250/hr | $100-200/hr | $40-100/hr |
| Legal | $80-200/hr | $90-180/hr | $40-90/hr |
| Finance | $70-180/hr | $80-160/hr | $35-80/hr |
Winner: Mercor for domain expert work. Their AI matching system is particularly effective at connecting specialists with relevant projects, and they have the widest range of domain-specific roles.
Vetting Process Comparison
Mercor
- AI interview (20 minutes, up to 3 retakes)
- Written assessments (role-specific, reusable across applications)
- Optional paid work trial (4-6 hours, paid regardless of outcome)
- Timeline: 1-7 days from application to first task
- Difficulty: Moderate to hard. The AI interview filters aggressively.
Braintrust
- Application review with portfolio/resume screening
- Skills assessment for technical roles
- Timeline: 1-5 days
- Difficulty: Moderate. They focus on credentials and demonstrated experience.
Scale AI
- Online qualification test (multiple choice + practical tasks)
- Onboarding modules (platform-specific training)
- Timeline: 3-7 days
- Difficulty: Easy to moderate. Lower barrier to entry, which also means more competition for tasks.
Multi-Platform Strategy
The platforms aren't mutually exclusive. Many top earners are active on 2-3 platforms simultaneously, using Braintrust or Mercor for high-paying project work and Scale AI for filling gaps when premium work is unavailable. See our guide on managing multiple platforms.
Worker Experience and Culture
Mercor
Mercor's AI-first approach means less human interaction during onboarding but faster matching. The Instant Offers system is praised by experienced workers who dislike applying repeatedly. Communication with project managers varies by client. Weekly payments through Stripe are reliable.
Braintrust
Braintrust differentiates itself with a decentralized, community-driven model. The zero-fee structure is genuinely unique — most platforms take 15-30% from one side or both. The tradeoff is that work availability can be less consistent than Mercor or Scale AI, as Braintrust is more selective about the projects it lists.
Scale AI
Scale AI has the largest operation and most established processes. The platform provides clear guidelines, training materials, and quality feedback systems. The downside is that rates are generally lower, and the task queue can be competitive — popular tasks get claimed quickly. Their Outlier AI subsidiary handles much of the RLHF work.
Which Platform Should You Choose?
Choose Mercor if:
- You have specialized domain expertise (medical, legal, finance)
- You're a software engineer earning $80+/hr equivalent
- You want AI-powered matching to bring work to you
- You prefer weekly payments and flexible scheduling
- You're willing to invest in a thorough vetting process for higher returns
Choose Braintrust if:
- You're a senior professional who wants maximum per-hour rates
- You want to keep 100% of your earnings (zero platform fees)
- You have strong credentials that speak for themselves
- You value community and decentralized governance
- You're comfortable with potentially less consistent work flow
Choose Scale AI if:
- You're new to AI training and want to build experience
- You value consistent, high-volume work availability
- You prefer structured onboarding with clear guidelines
- You want to get started quickly with a lower barrier to entry
- You're okay with lower rates in exchange for more available hours
Monthly Earnings Comparison (20 hrs/week)
| Worker Type | Mercor | Braintrust | Scale AI |
|---|---|---|---|
| RLHF Trainer | $3,200-4,800 | $4,800-8,000 | $1,600-3,200 |
| Software Engineer | $8,000-12,000 | $8,800-12,800 | $4,000-6,000 |
| Domain Expert | $6,400-14,000 | $6,400-12,800 | $2,800-6,400 |
The bottom line: if you have specialized skills, Mercor and Braintrust will pay you significantly more than Scale AI. If you're building your skills or need guaranteed volume, Scale AI is a solid starting point.
Browse all platform listings to compare current openings, or read more about getting hired on Mercor and maximizing your platform earnings.