Custom GPTs can't remember. Erys agents never forget.
Custom GPTs can't remember your users. They live inside ChatGPT, not your channels. And you're locked into a single provider. Erys gives you persistent memory, multi-channel delivery, and multi-model support — out of the box.
Feature-by-feature comparison
How Erys stacks up against OpenAI Assistants on the things that matter.
Persistent memory
Custom GPTs have no memory across sessions
Database-backed memory — agents remember every conversation
Delivery channels
GPTs live inside ChatGPT only; API requires custom builds
7 built-in channels: Telegram, Slack, WhatsApp, Discord, Email, SMS, WebChat
Model choice
OpenAI models only — no Claude, no Gemini
Claude, GPT, Gemini — choose the best model for each agent
Data residency
US-hosted only, no EU option for most tiers
EU-hosted (Netherlands) with GDPR compliance
Code execution
Code Interpreter with limitations
Full Linux sandbox with persistent storage and package installation
Branding
Your agent lives inside OpenAI's interface
Your agent, your brand — embed anywhere
Setup
GPT Builder (no-code) or Assistants API (developer-only)
Visual builder for everyone, full API for developers
Agent collaboration
Single GPTs work alone
Multi-agent teams that collaborate on tasks
Vendor lock-in
Entirely dependent on OpenAI pricing, policies, and uptime
Multi-model, multi-provider — switch models any time
Rate limits
Tied to usage tier, can be restrictive
Predictable per-agent pricing, no usage caps
Simple pricing, no surprises.
Custom GPTs need ChatGPT Plus. The Assistants API charges per token. Erys charges per agent — everything included.
| Cost | OpenAI Assistants | Erys |
|---|---|---|
| Custom GPTs | $20/mo (ChatGPT Plus required) | €10/agent/month |
| Assistants API | Token-based: ~$2.50/1M input, $10/1M output | Included |
| Channel integrations | Build it yourself (developer time) | Included — 7 channels built in |
| Hosting & infrastructure | Build it yourself (for Assistants API) | Included — fully managed |
Get started free
Set up your first agent in minutes. 100 free AI credits — no API keys needed.
100 free AI credits included.