MongoDB vs PostgreSQL
Fourteen of fourteen models named MongoDB first on the direct prompt; zero named PostgreSQL. MongoDB was named by fourteen of the fourteen models and PostgreSQL by eight and MongoDB carries 82 labels and PostgreSQL 13, so the shares are not directly comparable.
Named in three categories this edition.
Named in three categories 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 nosql databases page.
By framing
MongoDBFirst choices, of fourteen modelsPostgreSQL
Across every category in the November 2026 Edition, MongoDB and PostgreSQL were named in the same answer fifty-nine times, of the 243 answers naming MongoDB and the 99 naming PostgreSQL. In those answers PostgreSQL took the first choice five times and MongoDB thirty-two.
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 4.20 | | | | | | |
| 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 | | | | | |
MongoDB PostgreSQL first choice named as an alternative argued againstblank: not namedEach cell is one answer, MongoDB on the left and PostgreSQL on the right.The direct prompt
MongoDB first, PostgreSQL an alternative
14 of 14 modelsPostgreSQL was named in the answer but not as the choice, or not at all.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
MongoDB81%#1 of 12PostgreSQL2%#4 of 12MongoDB74%#1 of 14PostgreSQL4%#3 of 14MongoDB53%#1 of 14PostgreSQL2%#– of 14What the models said about MongoDB
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 MongoDB if you need multi-document ACID transactions” MiniMax M2.5 · negative prompt · hard negative
“MongoDB: Do not casually trust deployment defaults... choose read and write concerns deliberately, define schemas in application code” Perplexity Sonar · negative prompt · soft negative
“over managed cloud services like MongoDB Atlas, DynamoDB, or Cosmos DB — the latter can incur unexpected costs” Grok 4.20 · budget prompt · soft negative
“MongoDB Atlas is the default first choice for mid-market B2B because of flexible document model, strong developer experience and multi-cloud portability.” Muse Glimmer 30B · direct prompt · first choice
“MongoDB remains one of the most popular document-based NoSQL databases, offering scalability, flexibility, and strong indexing capabilities.” Muse Glimmer 30B · comparative prompt · first choice
“MongoDB Atlas is a strong default for mid-sized B2B use cases such as CRM pipelines, customer profiles, product catalogs and content feeds” Muse Glimmer 30B · paraphrase prompt · first choice
What the models said about PostgreSQL
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Three of three in this category shown.
“Use PostgreSQL + JSONB if you're early-stage and want maximum flexibility with minimal cost.” GPT-5.4 mini · budget prompt · first choice
“The Best "All-in-One" Alternative: PostgreSQL (with JSONB)” Gemini 3.5 Flash · budget prompt · first choice
“TL;DR: Default to Postgres. Reach for NoSQL only when you can state the specific access pattern or scale wall that forces it.” Muse Glimmer 30B · negative prompt · alternative
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.