The PEP model and release notes
Updated Oct 16, 2026 · Applies to Web, iPhone, and Android · All plans
PEP is the world's first AI model built for peptide research, and it writes the answers you get in ChatPEP. Each new release of PEP is announced in ChatPEP News, with release notes that say what changed.
What PEP does for you
PEP answers from the published research on peptides, cites the sources it draws on, and says how strong the evidence is, including when the human data is thin. See How to read an answer.
Find the release notes
- Go to ChatPEP News.
- Select Releases above the list of posts.
- The newest release is first.
Each release post describes what is new, such as compounds now covered in depth or a new capability. A shipped feature, such as the tracker or the iPhone app, is announced the same way as a Product update.
Release and product update emails
When a release or a product update is published, ChatPEP emails it to everyone with an account. Every one of these emails has an unsubscribe link at the bottom, and one click there stops all marketing email. To get them again, turn on Marketing emails in Settings, under Notifications. See Marketing emails.
Do I need to update anything?
No. Every chat uses the current release as soon as it ships, on the web, on iPhone, and on Android, with nothing to install. There is no setting to choose an earlier release.
Plans
What each plan includes, such as how many messages you can send and how much research an answer can review, is listed in Compare plans.
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Related articles
- What ChatPEP is, and what it is notChatPEP is an AI research assistant for peptides that cites its sources. It is research only, not medical advice.
- Compare plansWhat Free, Basic, Research, and Frontier each include, from daily messages to research depth, and what every plan shares.
- Marketing emailsWhat marketing email ChatPEP sends, and how to turn it off or back on after unsubscribing.
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