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OpenTrainPhD

Mathematics Expert for AI Evaluation

Create challenging mathematics problems and scenarios based on real proofs, formal methods, and computational workflows. Review AI-generated answers and explain where they are accurate, rigorous, or misaligned with mathematical practice.

Field
Math & statistics
Where
United States
Asks for
PhD
Posted
6 days ago

Pay data for your profession: Math AI trainer jobs · PhD AI trainer jobs

How this pay compares

The title points to rating and reviewing ai output: judging a model's answers or code against guidelines, such as which of two is better or whether one is correct and safe. What each kind of AI training work pays

At $75/hr, this role pays more than 44% of the 54 open math & statistics roles with a listed pay range, below the median of $83.

Open math & statistics roles that ask for a PhD have a median of $83/hr (17 roles).

Among platforms with 10 or more priced math & statistics roles, Alignerr has the highest median ($185/hr across 23 roles) and OpenTrain AI the lowest ($49/hr across 26).

OpenTrain AI roles that closed since late October stayed listed a median of 31 days (122 roles). OpenTrain AI posted this one 6 days ago.

Computed from 2,746 open roles we track across Mercor, micro1, Handshake AI, Alignerr, Appen and OpenTrain AI, refreshed daily. Midpoints of listed ranges; “up to” ceilings are left out of medians.

What you would earn at this rate

Rate

$75/hr

Per week, before tax

$1,125

Per month, if the work is steady

$4,875

Tax
Contract pay arrives with no tax withheld. A US contractor at this rate and these hours would set aside about $1,232 a month for self-employment tax plus federal income tax at the 12% bracket (25%, before state tax). Outside the US, your own country's rules apply.

Assumes paid hours only; unpaid assessments, onboarding and gaps between projects lower the real figure. Full take-home calculator · Track what you actually earn

Open math & statistics roles on each platform

The same kind of work, priced on every platform we track, with the best-paid open role on each.

PlatformOpenMedianBest-paid open role
Alignerr23$185/hrApplied Formal Methods Researcher (Lean 4)$170-200/hr
Mercor4$88/hr4 pricedMathematics Domain Expert$90-140/hr
OpenTrain AIthis role26$49/hrResearch Scientist: Formal Methods, Computational Science$135/hr
Handshake AI6up to $75/hrMath ExpertUp to $75/hr

“Up to” rows list only ceilings, so their median is a maximum, not comparable with the range midpoints above them.

All 60 open math & statistics roles →

The full listing

As posted on OpenTrain AI. See the original

The work

Create challenging mathematics problems and scenarios based on real proofs, formal methods, and computational workflows. Review AI-generated answers and explain where they are accurate, rigorous, or misaligned with mathematical practice.

  • Write structured feedback to help improve AI performance.
  • Use sound judgment in proof methods, symbolic computation, optimization, numerical analysis, or a core mathematics field.
  • Complete assignments independently in a remote, asynchronous setting.

What it pays and takes

  • Pay: Up to $75 per hour.
  • Work arrangement: Flexible, part-time contract work with no set schedule or minimum hours.
  • Location: Open to candidates in the United States.
  • Education: A PhD in pure or applied mathematics is listed; applicants with depth in at least two core qualification areas are also encouraged to apply.
  • Expertise: Demonstrated depth in proof and formal methods, symbolic computation, optimization, numerical analysis, or a field such as algebra, topology, geometry, number theory, analysis, or combinatorics.
  • Skills: Strong written communication, attention to detail, and the ability to explain complex mathematical ideas clearly.
  • Helpful experience: Theorem provers such as Lean, Coq, or Isabelle; symbolic tools such as SageMath or Mathematica; or formalizing proofs and working on problems beyond current AI capabilities.

How it works

Apply on OpenTrain with your resume, then complete the application on the hiring site.

About AI training work

AI training work uses human-written examples and reviews to help AI systems learn and improve. Specialized projects pay for subject expertise because careful mathematical judgment helps assess whether model answers are sound.

From applying to your first payment on OpenTrain AI

  1. 1

    Create a profile

    Create a free OpenTrain profile with your domains, languages and hourly rate.

  2. 2

    Apply

    Apply to the listing. Some listings hire through OpenTrain; others send you to the hiring platform.

  3. 3

    Funded milestones

    The client funds each milestone before work starts.

  4. 4

    First payment

    OpenTrain pays out to your connected payout method when the client approves the milestone. It doesn't publish a fixed payout schedule.

Sources: OpenTrain: AI training careers, OpenTrain docs: invoicing and payouts

Full OpenTrain AI profile: watch-outs and the public record →

Pay history

OpenTrain AI has listed this role at $75/hr since Nov 10, 2026 with no change.

Across OpenTrain AI's math & statistics roles, the median listed pay was $25/hr on Nov 1, 2026 (18 roles) and is $49/hr as of Nov 11, 2026 (26 roles).

What workers report about OpenTrain AI

Anonymous reports from people who applied or worked there: whether they got work, what they were paid and how fast.

Other math & statistics roles

All 60 math & statistics roles →