OpenAI's Agent Platform Expands from ChatGPT Work to the Agents API

ChatGPT Work and the Agents API are expanding into governed enterprise workflows with durable sessions, sandboxes, tool search, compaction, subagents, MCP, streaming, continuation, recovery guidance, BI connectors, Word integration, Chrome extensions, and plugin/app permission controls. Recent product-direction commentary highlights interruption-safe checkpoints, verification, recovery, and spend controls, but is speculative. Legacy-model retirements by September 28, GPT-5.5's reported October 14 retirement, GPT-6 Pro limits, and Codex migration implications add pressure to review connected and unattended workflows.