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Epsilla (YC S23)

All-in-one platform to create AI agents with your knowledge

★★★★★ 5.0/5
FactScore™ 15.1
VS

GPT-5

OpenAI’s most advanced model

★★★★★ 5.0/5
FactScore™ 65.1

Updated February 2026

Epsilla (YC S23) GPT-5
Rating 5.0★ 5.0★
Reviews 1 19
Pros 10 9
FactScore™ 15.1 65.1

FactScore™ Comparison

FactScore™ weighs both quality (rating) and popularity (reviews) for a fairer ranking than stars alone.

15.1
Epsilla (YC S23) FactScore™
👑
65.1
GPT-5 FactScore™
★ GPT-5 wins on FactScore™

Pros & Cons

Only in Epsilla (YC S23) — Pros

Easy to use Fast performance Helpful support High quality retrieval Knowledge search API access Community support Supports multiple data formats UI builder Vector database managed service

Both tools — Pros

—

Only in GPT-5 — Pros

AI assistant AI integration Actionable insights High-quality output Developer experience Time-saving Context aware Frequent updates High accuracy

Only in Epsilla (YC S23) — Cons

Expensive pricing

Both tools — Cons

—

Only in GPT-5 — Cons

Slow performance

Details

Epsilla (YC S23) GPT-5
Categories LLMs, AI Chatbots, AI Infrastructure Tools LLMs, Foundation Models
Platforms Web Web
Became Popular September 20, 2024 August 7, 2025
Website epsilla.com openai.com

Who Should Pick Which?

Choose Epsilla (YC S23) if...

  • Easy to use
  • Fast performance
  • Helpful support

Choose GPT-5 if...

  • AI assistant
  • AI integration
  • Actionable insights

With a FactScore™ of 15.1 vs 65.1, GPT-5 leads in community reception. Epsilla (YC S23) uniquely offers Easy to use and Fast performance, while GPT-5 stands out for AI assistant and AI integration.

3

What Users Say

Epsilla (YC S23)

K
Kunal Oct 11, 2024
★★★★★

I did a lot of research until I found Epsilla. Epsilla is the single best tool for non-technical teams to build meaningful AI services around knowledge bases. The best part is the quality of knowle...

GPT-5

R
Robin Sep 8, 2025
★★★★★

We spent months developing the new version of Tellers.AI, betting that foundation models would excel at long-form, structured outputs with native tool use. GPT-5 did not disappoint; it proved to be...

E
Elina Sep 20, 2025
★★★★★

As user study, pray, and achieve milestones, GPT-5 helps the pet reflect that progress through both words and actions, making the experience more meaningful. We also use GPT-5 to offer context-rich...

M
Max Sep 17, 2025
★★★★★

The Basedash data agent is powered by GPT-5. It allows us to ask incredibly complex questions and get genuine insights out of any data.

Frequently Asked Questions

Which is better, Epsilla (YC S23) or GPT-5?

Based on FactScore™, GPT-5 leads with a score of 65.1 vs 15.1. GPT-5 has a higher rating of 5.0★ compared to 5.0★.

What are the pros of Epsilla (YC S23) compared to GPT-5?

Epsilla (YC S23) uniquely offers: Easy to use, Fast performance, Helpful support, High quality retrieval, Knowledge search.

What are the pros of GPT-5 compared to Epsilla (YC S23)?

GPT-5 uniquely offers: AI assistant, AI integration, Actionable insights, High-quality output, Developer experience.

Is Epsilla (YC S23) better rated than GPT-5?

Epsilla (YC S23) is rated 5.0★ from 1 reviews. GPT-5 is rated 5.0★ from 19 reviews.

What is the FactScore™ of Epsilla (YC S23) and GPT-5?

FactScore™ weighs rating and review volume together. Epsilla (YC S23) scores 15.1 and GPT-5 scores 65.1.

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