OpenAI Upgrades API for Enhanced Voice Reliability and Agent Speed

2026-02-25

OpenAI has launched two major API updates for developers, introducing the new gpt-realtime-1.5 model designed to enhance voice command reliability. Internal tests indicate a 10% improvement in digit and letter transcription, a 5% boost in logical audio tasks, and a 7% increase in instruction tracking rates. The audio model has also been upgraded to version 1.5.

Additionally, the Responses API now supports WebSockets, eliminating the need to retransmit full context with each request. Instead, a persistent connection is established to send data only when new information arrives. OpenAI reports that this modification accelerates tool calls by complex AI agents by 20% to 40%.

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