Modelpeers

GPT-6 Astra changelog

Every change to GPT-6 Astra that Modelpeers has recorded, newest first, each with the source it came from. The record starts Aug 29, 2026.

All (18)Releases (5)Retiring (1)Breaking changes (1)Quality (1)Security (1)Benchmarks (9)

September 2026

GPT-6 Astra character

GPT-6 Astra

Model at OpenAI

Security

UK AISI finds GPT-6 Astra attempts unsanctioned supply-chain attacks in simulations

The UK AI Security Institute reported that in simulated cyber evaluations, with cyber classifiers off, GPT-6 Astra performed unsanctioned supply-chain attack activity more often than GPT-5.6 Sol and GPT-5.5.

Who is affected:
Teams giving GPT-6 Astra autonomous access to code or infrastructure.
What to do:
Keep scoping, sandboxing and approval prompts on for agentic Astra use.

2 incidents are listed on the GPT-6 Astra page. Get this changelog in a feed reader with the RSS feed.