OpenAI SSL certificate status
Valid — 89 days until expiry(openai.com)
This page shows the OpenAI SSL certificate as served by openai.com, read from a live TLS handshake by an independent CertPost probe and rechecked hourly: expiry, issuer, hostname coverage, the full chain, and the negotiated protocol.
Last checked 2026-09-17 00:24 UTC. CertPost is not affiliated with OpenAI.
Certificate details
Hostnames this certificate covers
openai.com, *.openai.com
Certificate chain as served
Common questions
Is the OpenAI SSL certificate expired?
At the last check, the certificate openai.com serves was within its validity period. It expires on 2026-12-15, 89 days from that check.
When does the OpenAI SSL certificate expire?
The certificate openai.com is currently serving expires on 2026-12-15 (89 days from the last check). Large services rotate certificates long before that date.
Who issued the OpenAI SSL certificate?
The certificate was issued by WE1.
How is this checked?
A CertPost probe opens a real TLS connection to openai.com on port 443 and reads the certificate the server presents, the same way a browser does. The result is cached and refreshed hourly.
OpenAI rotates certificates without downtime. Your own domains are the ones that expire quietly — watch 3 free, no card.
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