FrontierThe story, in brief
Addendum to OpenAI o3 and o4-mini system card: OpenAI o3 Operator
OpenAI just swapped the engine under Operator. o3 replaces GPT-4o—here's what that means for agent performance.
The KeyNews take
Why it matters
OpenAI is upgrading its Operator agent from GPT-4o to o3, signaling confidence in o3's reasoning and task-execution capabilities. This is a real-world deployment signal that o3 outperforms GPT-4o on agentic workloads—a critical benchmark for AI labs competing on agent feasibility.
The key facts
5 to knowOpenAI Operator now runs on o3 (upgraded from GPT-4o)
API version remains GPT-4o for backward compatibility
System card addendum published May 23, 2025
o3 agent deployment indicates superior reasoning/task execution vs GPT-4o
Signals o3 readiness for production agentic workflows
Go to the source
OpenAI Blogopenai.com
Publisher excerpt: We are replacing the existing GPT-4o-based model for Operator with a version based on OpenAI o3. The API version will remain based on 4o.