OpenAI launches a research preview of GPT-5.3-Codex-Spark, a smaller version of GPT-5.3-Codex that it claims generates code 15 times faster, for Pro users (David Gewirtz/ZDNET)

David Gewirtz / ZDNET: OpenAI launches a research preview of GPT-5.3-Codex-Spark, a smaller version of GPT-5.3-Codex that it claims generates code 15 times faster, for Pro users   —  ZDNET's key takeaways  — OpenAI targets “conversational” coding, not slow batch-style agents.  — Big latency wins: 80% faster roundtrip, 50% faster time-to-first-token.