HR AI Index
Index Compensation and total rewards Compensation benchmarkin › Comprehensive.io vs Mercer
Compensation benchmarking data · September 2026 Edition

Comprehensive.io vs Mercer

Zero of twelve models named Comprehensive.io first on the direct prompt; zero named Mercer. Comprehensive.io was named by eleven of the twelve models and Mercer by ten and Comprehensive.io carries 12 labels and Mercer 28, so the shares are not directly comparable.

Comprehensive.io

accepted challenger

Named in three categories this edition.

Mercer

criticized challenger

Named in four categories this edition.

First-choice share12%6%Of first choices across the direct, paraphrase, budget and scale prompts, 0 to 100.
Negative rate0%43%Negative labels as a share of the product's labels, 0 to 100.
Rank in category#3#4A position in a field of 8; printed, not drawn.
Labels1228A count; the two differ.
The two percentage rows are drawn on one 0 to 100 track, Comprehensive.io reading right to left. Rank and label count are printed, not drawn.Payscale was named alongside these two in ten of the twelve direct answers. Payscale vs Comprehensive.io · Payscale vs Mercer · Pave vs Comprehensive.io

Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all twelve models, for a mid-market B2B company; rank is within the category; every quote names the model and the prompt it came from. Both figures come from the compensation benchmarking data page.

By framing

How many of the twelve models made each the first choice, per way of asking, and how many argued against it.
Comprehensive.ioFirst choices, of twelve modelsMercer
Direct005 against Mercer
Paraphrase032 against Mercer
Comparative02
Budget-constrained604 against Mercer
Scale-constrained001 against Mercer
Negative00
Bars are first choices, 0 to 12 each sideModels that argued againstA model can name both, so the two sides of a row do not sum to twelve.

Every model, every framing

The seventy-two answers behind the chart above, one cell each: where Comprehensive.io and Mercer stood in it.
ModelDirectParaphraseComparativeBudget-constrainedScale-constrainedNegative
Claude Haiku 4.5
GPT-5.4 mini
Gemini 3.5 Flash
Perplexity Sonar
Grok 4.1 Fast
Mistral Small
DeepSeek V4 Flash
Llama 4 Maverick
Qwen 3.7 Flash
Kimi K2
GLM 4.7 FlashX
MiniMax M2.5
Comprehensive.io Mercer first choice named as an alternative argued againstblank: not namedEach cell is one answer, Comprehensive.io on the left and Mercer on the right.

The direct prompt

The plain question, one answer per model, grouped by where Comprehensive.io and Mercer stood in it.

Neither was the first choice, one was named

3 of 12 modelsThe answer put something else first and named one of the two as an alternative.
Kimi K2Payscale, SalaryCube alternatives: Mercer, Radford, Salary.com
GLM 4.7 FlashXPave alternatives: Aon Radford, CaptivateIQ, Ficstar, Mercer, OpenComp, Payscale Ascent, Ravio, Salary.com CompAnalyst
MiniMax M2.5Payscale alternatives: Comprehensive.io

Neither was named

9 of 12 modelsThe answer made no first choice from these two in this category.
Claude Haiku 4.5Payscale alternatives: Lattice, SalaryCube, beqom
GPT-5.4 miniPayscale alternatives: Radford, Salary.com
Gemini 3.5 FlashPave alternatives: Carta Total Comp, Figures, Payscale, Radford, Ravio, Salary.com
Perplexity SonarPayscale alternatives: Ravio, SalaryCube
Grok 4.1 FastPayscale alternatives: Pave, Salary.com
Mistral SmallSalaryCube alternatives: Pave, Payfactors, Salary.com
DeepSeek V4 FlashPayscale alternatives: ERI, Pave, Ravio, Salary.com
Llama 4 MaverickPayscale
Qwen 3.7 FlashPayscale alternatives: Pave, Payfactors, Salary.com, SalaryCube

Bold names in an answer are the products the judge labeled a first choice; a model naming several gives each of them that label. The full answer text for every row is in the record.

By buyer segment

The same question asked on behalf of a different buyer. Each standing is computed within its segment and they are never added together. The figures above are the mid-market standing, which is the one the category orders by.
Small business
Comprehensive.io leads by two points.
Comprehensive.io2%#6 of 10
Mercer0%#9 of 10
The full small business standing →
Mid-marketThe figures above
Comprehensive.io leads by six points.
Comprehensive.io12%#3 of 8
Mercer6%#4 of 8
The full mid-market standing →
Enterprise
The order flips: Mercer leads at enterprise.
Mercer26%#1 of 10
Comprehensive.io0%#– of 10
The full enterprise standing →

What the models said about Comprehensive.io

Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Three of four in this category shown.

“three free salary benchmarking tools cover most needs at zero cost: Pave (tech roles, under 200 employees), Comprehensive.io (US tech daily data), and BLS OEWS” Claude Haiku 4.5 · budget prompt · first choice
“Free daily-refreshed tech salary data from 6,000+ U.S. companies (no participation needed) ... Great for startups/lean teams.” Grok 4.1 Fast · budget prompt · first choice
“Pave and Comprehensive.io are currently leading the market for affordable or free options” Qwen 3.7 Flash · budget prompt · first choice

What the models said about Mercer

Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Six of eight in this category shown.

“Avoid over-investing in Mercer/WTW unless you have global complexity” Kimi K2 · paraphrase prompt · hard negative
“Avoid traditional surveys (Mercer/Radford: $10k+/year) unless scaling.” Grok 4.1 Fast · budget prompt · hard negative
“high-end, legacy enterprise surveys like Mercer, Radford (Aon), or Willis Towers Watson (WTW)—which can easily cost $20,000 to $40,000+ annually—are generally out of reach” Gemini 3.5 Flash · budget prompt · soft negative
“Buy one major survey (like Robert Half or Mercer) to ensure you are paying within the 25th–75th percentiles” Qwen 3.7 Flash · paraphrase prompt · first choice
“The strongest fit from the results is Mercer or Salary.com/Compdata for broad benchmarking” Perplexity Sonar · paraphrase prompt · first choice
“Especially strong in pay and total rewards benchmarking, plus HR strategy.” GPT-5.4 mini · comparative prompt · first choice
Also compared

Comparisons are drawn for the top eight products in each category, each against each. The output is the models' output; nothing here is a recommendation by the index.