Customer identity and access management · October 2026 Edition
Auth0 vs FusionAuth
Five 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 eleven and Auth0 carries 60 labels and FusionAuth 22, so the shares are not directly comparable.
Named in eight categories this edition.
Named in one category this edition.
First-choice share18%5%Of first choices across the direct, paraphrase, budget and scale prompts, 0 to 100.
Negative rate22%5%Negative labels as a share of the product's labels, 0 to 100.
Rank in category#2#6A position in a field of 14; printed, not drawn.
Labels6022A 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.Clerk was named alongside these two in nine of the fourteen direct answers. Frontegg vs Auth0 · Frontegg vs FusionAuth · Auth0 vs Clerk
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
Direct503 against Auth0
Paraphrase101 against Auth0
Comparative601 against Auth0
Budget-constrained323 against Auth0
Scale-constrained111 against Auth0 · 1 against FusionAuth
Negative004 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 4.1 Fast | | | | | | |
| 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
5 of 14 modelsFusionAuth was named in the answer but not as the choice, or not at all.Grok 4.1 FastAuth0 alternatives: Clerk, Frontegg, FusionAuth, Microsoft Entra External ID, Stytch, WorkOS
DeepSeek V4 FlashAuth0, Frontegg alternatives: Clerk, Microsoft Entra External ID, Stytch
Qwen 3.7 FlashAuth0, Clerk alternatives: Microsoft Entra ID
GLM 4.7 FlashXAuth0 alternatives: Clerk, Descope, LoginRadius, Microsoft Entra External ID
MiniMax M2.5Auth0, Clerk alternatives: Descope, LoginRadius
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.GPT-5.4 miniFrontegg alternatives: Auth0/Okta Customer Identity Cloud, FusionAuth, Okta
Kimi K2Clerk, Frontegg alternatives: FusionAuth, WorkOS
GPT-6 LunaWorkOS AuthKit alternatives: Auth0, Microsoft Entra External ID, Stytch
Muse Glimmer 30BFrontegg, LoginRadius alternatives: Auth0, Ping Identity
Neither was named
5 of 14 modelsThe answer made no first choice from these two in this category.Claude Haiku 4.5Descope, Frontegg alternatives: OneWelcome Identity Platform, SSOJet, WorkOS
Gemini 3.5 FlashWorkOS alternatives: Clerk, Frontegg, Kinde
Perplexity SonarLoginRadius alternatives: Clerk, Frontegg, Microsoft Entra External ID
Mistral SmallLoginRadius alternatives: Thales OneWelcome
Llama 4 MaverickLoginRadius alternatives: Clerk, OneWelcome Identity Platform
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
Enterprise
What 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.
“Budget Trap to Avoid: Auth0 (Okta) ... it is not recommended for companies on a limited budget” Gemini 3.5 Flash · budget prompt · hard negative
“The Catch: It can become exceptionally expensive. Because its pricing scales heavily on Monthly Active Users (MAUs), a growing customer base can lead to a highly ballooned bill.” Gemini 3.5 Flash · comparative prompt · soft negative
“Auth0 has issued advisories about misconfigurations, account creation fraud, credential attacks, MFA bypass, and session/token hijacking.” GLM 4.7 FlashX · negative prompt · soft negative
“Frontegg (if multi-tenant org management is a priority) or Auth0 (if you want the most mature, proven platform) are the strongest overall picks” DeepSeek V4 Flash · direct prompt · first choice
“Medium (Standard Devs) | Fully Managed Cloud<br>Best balance of speed, security, and ease of use. | Auth0 (Okta), AWS Cognito, Firebase Auth” Qwen 3.7 Flash · scale prompt · first choice
“Choose Auth0 if you want to get a product to market quickly and value developer flexibility over on-prem control.” GLM 4.7 FlashX · comparative 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. Four of five in this category shown.
“Lower ongoing costs but requires more ops” Kimi K2 · scale prompt · soft negative
“Prioritize platforms with strong mid-market fit like LoginRadius (simplicity) or FusionAuth (cost-effective self-hosting).” Grok 4.1 Fast · scale prompt · first choice
“Lowest total cost (no per‑MAU fees): Keycloak or FusionAuth (self‑hosted).” GLM 4.7 FlashX · budget prompt · first choice
“Best overall for tight budgets: FusionAuth” GPT-5.4 mini · budget prompt · first choice
Also compared
Frontegg vs Auth0Frontegg vs FusionAuthAuth0 vs ClerkAuth0 vs LoginRadiusAuth0 vs DescopeAuth0 vs WorkOSAuth0 vs Microsoft Entra External IDClerk vs FusionAuthLoginRadius vs FusionAuthDescope vs FusionAuthFusionAuth vs WorkOSFusionAuth vs Microsoft Entra External IDAll 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.