Customer identity and access management · November 2026 Edition
Auth0 vs FusionAuth
Six of fourteen models named Auth0 first on the direct prompt; zero named FusionAuth. Auth0 was named by fourteen of the fourteen models and FusionAuth by eight and Auth0 carries 69 labels and FusionAuth 14, so the shares are not directly comparable.
Named in five categories this edition.
Named in two categories this edition.
First-choice share34%6%Of first choices across the direct, paraphrase, budget and scale prompts, 0 to 100.
Negative rate22%0%Negative labels as a share of the product's labels, 0 to 100.
Rank in category#1#5A position in a field of 16; printed, not drawn.
Labels6914A count; the two differ.
The two percentage rows are drawn on one 0 to 100 track, Auth0 reading right to left. Rank and label count are printed, not drawn.Frontegg was named alongside these two in twelve of the fourteen direct answers. Auth0 vs WorkOS AuthKit · Auth0 vs Frontegg · Auth0 vs Kinde
Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all fourteen 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 customer identity and access management page.
By framing
How many of the fourteen models made each the first choice, per way of asking, and how many argued against it.
Auth0First choices, of fourteen modelsFusionAuth
Direct603 against Auth0
Paraphrase901 against Auth0
Comparative120
Budget-constrained134 against Auth0
Scale-constrained202 against Auth0
Negative005 against Auth0
Bars are first choices, 0 to 14 each sideModels that argued againstA model can name both, so the two sides of a row do not sum to fourteen.
Every model, every framing
The eighty-four answers behind the chart above, one cell each: where Auth0 and FusionAuth stood in it.
| Model | Direct | Paraphrase | Comparative | Budget-constrained | Scale-constrained | Negative |
|---|---|---|---|---|---|---|
| Claude Haiku 4.5 | | | | | ||
| GPT-5.4 mini | | | | | ||
| Gemini 3.5 Flash | | | | | | |
| Perplexity Sonar | | | | | | |
| Grok 4.20 | | | | | | |
| Mistral Small | | | | | ||
| DeepSeek V4 Flash | | | | | | |
| Llama 4 Maverick | | | ||||
| Qwen 3.7 Flash | | | | | ||
| Kimi K2 | | | | |||
| GLM 4.7 FlashX | | | | | | |
| MiniMax M2.5 | | | ||||
| GPT-6 Luna | | | | | | |
| Muse Glimmer 30B | | | | |
Auth0 FusionAuth first choice named as an alternative argued againstblank: not namedEach cell is one answer, Auth0 on the left and FusionAuth on the right.The direct prompt
The plain question, one answer per model, grouped by where Auth0 and FusionAuth stood in it.
Auth0 first, FusionAuth an alternative
6 of 14 modelsFusionAuth was named in the answer but not as the choice, or not at all.Claude Haiku 4.5Auth0 alternatives: Frontegg, OneLogin, The OneWelcome Identity Platform
GPT-5.4 miniAuth0 alternatives: Frontegg, Ping Identity
Perplexity SonarAuth0 alternatives: Amazon Cognito, Frontegg, FusionAuth, Microsoft Entra External ID, WorkOS AuthKit
Mistral SmallAuth0 alternatives: Frontegg, Microsoft Entra External ID
Llama 4 MaverickAuth0 alternatives: IBM Verify, Microsoft Entra External ID, Ping Identity, WSO2 Identity Server, WorkOS AuthKit
GLM 4.7 FlashXAuth0 alternatives: Amazon Cognito, Descope, Frontegg, Microsoft Entra External ID, Ping Identity, SSOJet, Stytch, Transmit Security
Neither was the first choice, one was named
4 of 14 modelsThe answer put something else first and named one of the two as an alternative.Grok 4.20WorkOS AuthKit alternatives: Auth0, Frontegg, Stytch
Qwen 3.7 FlashFrontegg alternatives: Auth0, Descope, Microsoft Entra External ID, Stytch
GPT-6 LunaWorkOS AuthKit alternatives: Auth0, Stytch
Muse Glimmer 30BKinde, WorkOS AuthKit alternatives: Auth0, Frontegg, Okta, OneLogin
Neither was named
4 of 14 modelsThe answer made no first choice from these two in this category.Gemini 3.5 FlashWorkOS AuthKit alternatives: Clerk, Descope, Frontegg, Stytch
DeepSeek V4 FlashFrontegg alternatives: Descope, Kinde, WorkOS AuthKit
Kimi K2WorkOS AuthKit alternatives: Frontegg, Stytch
MiniMax M2.5OneLogin alternatives: Frontegg, LoginRadius, SSOJet
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
Mid-marketThe figures above
Auth0 leads by twenty-eight points.
Auth034%#1 of 16FusionAuth6%#5 of 16Enterprise
Auth0 leads by twenty-eight points.
Auth038%#1 of 13FusionAuth11%#– of 13What the models said about Auth0
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Six of eight in this category shown.
“Post‑acquisition pricing increases (2–3× at renewal) reported by long‑term customers... Developer sentiment shows sharp declines in support quality” GLM 4.7 FlashX · negative prompt · hard negative
“its price scales steeply once you leave the free tier... For budget-conscious growth, alternative providers or open-source solutions generally offer a more predictable cost trajectory.” Gemini 3.5 Flash · budget prompt · soft negative
“Sudden Cost Escalation: Auth0 and Okta are market leaders with excellent developer experiences, but their pricing models can scale exponentially” Gemini 3.5 Flash · negative prompt · soft negative
“Excellent for developers, strong in B2C with passwordless, social login, and customization. Great docs and extensibility. Often tops B2C/developer rankings.” Grok 4.20 · scale prompt · first choice
“Auth0 remains the strongest default because of its maturity, enterprise SSO support (critical for B2B), multi-tenant organizations model” DeepSeek V4 Flash · paraphrase prompt · first choice
“Start with Auth0 if you want the most flexible, feature-rich solution with excellent developer experience and strong B2B capabilities.” GLM 4.7 FlashX · paraphrase prompt · first choice
What the models said about FusionAuth
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Three of four in this category shown.
“For the most budget-conscious approach, FusionAuth and Keycloak stand out because they offer free self-hosted options with no per-user fees.” Claude Haiku 4.5 · budget prompt · first choice
“For most companies with a limited budget, I'd recommend starting with FusionAuth's free Community Edition” DeepSeek V4 Flash · budget prompt · first choice
“Best balance of cost + features: FusionAuth” GPT-5.4 mini · budget prompt · first choice
Also compared
Auth0 vs WorkOS AuthKitAuth0 vs FronteggAuth0 vs KindeAuth0 vs ClerkAuth0 vs KeycloakAuth0 vs Firebase AuthenticationWorkOS AuthKit vs FusionAuthFrontegg vs FusionAuthKinde vs FusionAuthFusionAuth vs ClerkFusionAuth vs KeycloakFusionAuth vs Firebase AuthenticationAll twenty-eight head-to-head pages and the full CIAM standing
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.