OpenAI Pauses Frontier Training Again

The real story is that agent containment is becoming an operational bottleneck, while cheaper models intensify commercial pressure.

• –DNS access shows that sandbox security must cover indirect channels, not only HTTP traffic.
• –OpenAI’s response suggests safety monitoring now directly affects training timelines and compute economics.
• –DeepSeek’s run-rate figure is annualized revenue, not $1 billion in booked sales.
• –Developers should design agent systems with layered egress controls, human escalation, and auditable tool permissions.
• –The briefing combines verified incidents with less-substantiated claims, so readers should separate primary disclosures from commentary.