On the same day Google released Gemini 3.1 Flash-Lite, OpenAI also launched a faster version of its GPT-5.3 family on Tuesday.
GPT 5.3 Instant is the first model in OpenAI’s GPT 5.3 family, with Pro and Thinking versions coming soon. The Instant models are somewhat of a workhorse in OpenAI’s stable, and in its ‘Auto’ model, ChatGPT routes all tasks it deems easy enough to them. When deeper reasoning is needed, it will pick the Thinking models.
GPT-5.3 Instant will reduce “unnecessary dead ends, caveats, and overly declarative…

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