Project
OpenAI API product that runs the agent loop on OpenAI infrastructure, managing model calls, tool use, session state and code sandboxes for the developer.
OpenAI's Ultrafast tier, unveiled at DevDay 2026, sells faster GPT-6 Astra tokens at six times the standard API rate. Speed is now a separate line on the bill, so teams building coding pipelines have to decide which jobs are worth it.
Reality
OpenAI plans to shut down Agent Builder on November 30, 2026, so teams that built on it need another place to run their agent loops. The three OpenAI alternatives differ mainly in who runs that loop and who stores its state.
Reality
OpenAI's new Managed Agents platform charges only for the tokens and tools agents consume, with no added API fee. Buyers get a simple bill for a runtime whose shutdown controls, promised to Congress, are still being built, according to Tech Times.
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OpenAI's Agents API, in public beta since DevDay 2026, runs sessions, orchestration, context compaction and recovery for developers' agents. Teams that wrote their own loop can hand that state to OpenAI and keep their tools and their choice of sandbox.
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Misha, who works on Gobare, found in public docs that OpenAI may delete a sandbox idle for an hour and Gobare pauses one after five minutes. Perplexity promises nothing between responses, so jobs that wait on a human or serve a preview have to fit one of those clocks.
Reality
OpenAI's Agents API and Cursor's Projects, both launched September 10, put one coordinator agent in charge of specialized coding workers. Teams adopting either now have to decide where that coordinator runs and who holds its state.
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OpenAI's guide prices reused input tokens at a discount of up to 90 percent. It also says cached key-value states sit on individual machines, so an unchanged prefix can still miss the cache when routing overflows.
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OpenAI's Agents API, in public beta since September 10th, runs the Codex harness on OpenAI's own infrastructure. The documentation says data residency is US-only and Zero Data Retention is unsupported, whichever sandbox you pick.
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