OpenAI WebSocket Mode for Responses API
Persistent AI agents. Up to 40% faster.
OpenAI WebSocket Mode for Responses API launched on March 1, 2026 with 131 votes, #295 of 23,380 launches that month and more than 95% of that year's launches.
What it does
Every agent turn, you're resending the full context. Again. That overhead compounds fast. WebSocket Mode for the Responses API keeps a persistent connection, sends only incremental inputs, and cuts end-to-end latency by up to 40% on heavy tool-call workflows.
Learn how to use Responses API WebSocket mode with response creation, continuation, and multiplexing.
Use one persistent WebSocket connection for parallel conversations, response-chain forks, and incremental inputs for lower-latency agentic workflows. The Responses API supports a WebSocket mode for long-running, tool-call-heavy workflows. Beyond lowering latency, stream_id enables WebSocket multiplexing: one persistent connection to /v1/responses can run parallel conversations and fork an existing conversation onto a new stream. Continue each turn by sending only new input items plus previous_response_id . WebSocket mode is compatible with both Zero Data Retention (ZDR) and store=false . WebSocket mode is most useful when a workflow involves many model-tool round trips (for example, agentic…from developers.openai.com
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