PostgreSQL vs Azure Cosmos DB
Zero of fourteen models named PostgreSQL first on the direct prompt; zero named Azure Cosmos DB. PostgreSQL was named by eight of the fourteen models and Azure Cosmos DB by twelve and PostgreSQL carries 13 labels and Azure Cosmos DB 24, so the shares are not directly comparable.
Named in three 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 nosql databases page.
By framing
PostgreSQLFirst choices, of fourteen modelsAzure Cosmos DB
Across every category in the November 2026 Edition, PostgreSQL and Azure Cosmos DB were named in the same answer twenty-one times, of the 99 answers naming PostgreSQL and the 103 naming Azure Cosmos DB. In those answers Azure Cosmos DB took the first choice zero times and PostgreSQL six.
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 | | |
PostgreSQL Azure Cosmos DB first choice named as an alternative argued againstblank: not namedEach cell is one answer, PostgreSQL on the left and Azure Cosmos DB on the right.The direct prompt
Neither was the first choice, one was named
5 of 14 modelsThe answer put something else first and named one of the two as an alternative.Neither was named
9 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
PostgreSQL2%#4 of 12Azure Cosmos DB0%#9 of 12PostgreSQL4%#3 of 14Azure Cosmos DB2%#6 of 14Azure Cosmos DB12%#3 of 14PostgreSQL2%#– of 14What 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
What the models said about Azure Cosmos DB
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 managed enterprise tiers (DynamoDB, Cosmos DB, etc.)” GLM 4.7 FlashX · budget prompt · hard 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
“Proprietary APIs (DynamoDB, Cosmos DB) make migration difficult.” MiniMax M2.5 · scale prompt · soft negative
“lean toward a managed, cloud-specific solution (like DynamoDB or Cosmos DB)” Qwen 3.7 Flash · scale prompt · first choice
“Choose it when Microsoft Azure, globally distributed deployment, or multi-region consistency options are central requirements.” Perplexity Sonar · direct prompt · alternative
“Cloud-Native / Managed Key-Value | AWS DynamoDB, Azure Cosmos DB | Zero-maintenance, seamless cloud integration” Gemini 3.5 Flash · scale 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.