# QuestDB vs Prometheus: which do AI models recommend for time series dbs, October 2026

IT AI Recommendation Index, October 2026 Edition, Time series databases. Zero of fourteen models named QuestDB first on the direct prompt; zero named Prometheus. Page: https://it-ai-index.com/it-data/time-series-databases/questdb-vs-prometheus/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| QuestDB | 4% | #4 of 9 | 4% | 57 | 14 of 14 |
| Prometheus | 2% | #5 of 9 | 19% | 43 | 14 of 14 |

## The direct prompt, model by model

- Claude Haiku 4.5: neither first, one named (first choices: InfluxDB, TimescaleDB) (alternatives: Prometheus)
- GPT-5.4 mini: neither first, one named (first choices: TimescaleDB) (alternatives: ClickHouse Cloud, InfluxDB, QuestDB)
- Perplexity Sonar: neither first, one named (first choices: TimescaleDB) (alternatives: Amazon Timestream, InfluxDB, QuestDB)
- Mistral Small: neither first, one named (first choices: TimescaleDB) (alternatives: InfluxDB, QuestDB)
- DeepSeek V4 Flash: neither first, one named (first choices: TimescaleDB) (alternatives: ClickHouse Cloud, InfluxDB, QuestDB)
- Qwen 3.7 Flash: neither first, one named (first choices: TimescaleDB) (alternatives: InfluxDB, QuestDB)
- Kimi K2: neither first, one named (first choices: TimescaleDB) (alternatives: InfluxDB, QuestDB)
- GLM 4.7 FlashX: neither first, one named (first choices: TimescaleDB) (alternatives: ClickHouse Cloud, QuestDB)
- MiniMax M2.5: neither first, one named (first choices: InfluxDB, TimescaleDB) (alternatives: Amazon Timestream, QuestDB)
- GPT-6 Luna: neither first, one named (first choices: TimescaleDB) (alternatives: ClickHouse Cloud, InfluxDB, Prometheus)
- Muse Glimmer 30B: neither first, one named (first choices: TimescaleDB) (alternatives: InfluxDB, QuestDB)
- Gemini 3.5 Flash: neither named (first choices: TimescaleDB) (alternatives: ClickHouse Cloud, InfluxDB)
- Grok 4.1 Fast: neither named (first choices: InfluxDB) (alternatives: ClickHouse Cloud, TimescaleDB)
- Llama 4 Maverick: neither named

## What the models said about QuestDB

- "QuestDB is strong for time-centric analytics, but it is not the best choice if most of your queries do not filter by time" (Perplexity Sonar, negative prompt, soft negative)
- "QuestDB (SQLi)" (GLM 4.7 FlashX, negative prompt, soft negative)
- "1. QuestDB: A time series database that is designed to handle large amounts of data and provide fast query performance." (Llama 4 Maverick, paraphrase prompt, first choice)
- "specialized TSDBs like InfluxDB, TimescaleDB, or QuestDB are generally safer choices" (Mistral Small, negative prompt, first choice)
- "For new projects in 2026, I'd strongly lean toward QuestDB" (DeepSeek V4 Flash, negative prompt, first choice)

## What the models said about Prometheus

- "Prometheus local storage as your only durable, highly available store. ... its local TSDB isn't clustered or replicated." (GPT-6 Luna, negative prompt, soft negative)
- "Prometheus is by default free to use... Prometheus is an excellent choice as a powerful open-source monitoring and alerting toolkit." (Claude Haiku 4.5, budget prompt, first choice)

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. Comparisons are drawn for the top eight products in each category. Published under CC BY 4.0; the output is the models' output, and nothing here is a recommendation by the index.