GPT- 5.3-Codex-Spark Research Preview with 1000 Tokens per Second

Apparently, while working on Spark, something was implemented that many more developers will benefit from:

x.com

Steve ☕️

@stevendcoffey

Hard to overstate just how much work went into this one sentence. HUGE props to @brianyu8, @ashwinnathan09 and team on making these huge improvements Websockets in /v1/responses landing in GA soon! pic.x.com/cVH1eOobYw

6:14 PM - 12 Feb 2026 46 2