Question 1

What is the EOL Risk Score for Openai API Models GPT-5.3 Chat?

Accepted Answer

Openai API Models GPT-5.3 Chat has an EOL Risk Score™ of 35 out of 100, placing it in the Medium risk band. The score is calculated from four factors: EOL Recency (25/40), Attack Surface (10/30), CISA KEV Exposure (0/20), and Extended Support Availability (0/10).

Question 2

Is Openai API Models GPT-5.3 Chat still supported?

Accepted Answer

Openai API Models GPT-5.3 Chat is no longer supported — it has passed its end of life date (August 10, 2026). No further security patches will be issued. Upgrade to a supported version or obtain extended lifecycle support.

Question 3

When does Openai API Models GPT-5.3 Chat reach end of life?

Accepted Answer

Openai API Models GPT-5.3 Chat reached (or will reach) end of life on August 10, 2026. After this date, no security patches or bug fixes are issued by the vendor.

Question 4

What are the security risks of running Openai API Models GPT-5.3 Chat after end of life?

Accepted Answer

After end of life, Openai API Models GPT-5.3 Chat no longer receives security patches. Any newly discovered CVEs remain unpatched indefinitely. Organizations running EOL software also face compliance violations under SOC 2, PCI DSS, HIPAA, and ISO 27001, which require use of supported software versions.