Clerk vs FusionAuth
Three of fourteen models named Clerk first on the direct prompt; zero named FusionAuth. Clerk was named by twelve of the fourteen models and FusionAuth by eleven and Clerk carries 31 labels and FusionAuth 22, so the shares are not directly comparable.
Named in two categories this edition.
Named in one category this edition.
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
ClerkFirst choices, of fourteen modelsFusionAuth
Across every category in the October 2026 Edition, Clerk and FusionAuth were named in the same answer thirty-one times, of the 102 answers naming Clerk and the 52 naming FusionAuth. In those answers FusionAuth took the first choice one time and Clerk fourteen.
Every model, every framing
| 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 | | | |
Clerk FusionAuth first choice named as an alternative argued againstblank: not namedEach cell is one answer, Clerk on the left and FusionAuth on the right.The direct prompt
Clerk first, FusionAuth an alternative
3 of 14 modelsFusionAuth was named in the answer but not as the choice, or not at all.Neither was the first choice, one was named
7 of 14 modelsThe answer put something else first and named one of the two as an alternative.Neither was named
4 of 14 modelsThe answer made no first choice from these two in this category.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
Clerk30%#1 of 14FusionAuth5%#6 of 14FusionAuth6%#– of 12Clerk0%#– of 12What the models said about Clerk
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Four of five in this category shown.
“Choose Clerk only if you are a startup ... not necessarily the cheapest long-term option” Perplexity Sonar · budget prompt · soft negative
“For most companies with limited budgets, Clerk's free tier or self-hosted Keycloak are the two best choices” DeepSeek V4 Flash · budget prompt · first choice
“Clerk is my pick for a small team that wants to keep costs low without building much authentication infrastructure.” GPT-6 Luna · budget prompt · first choice
“Frontegg and Clerk are particularly well-suited due to their B2B-focused features and ease of integration” Mistral Small · 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. 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
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.