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ZDNET's key takeaways
GPT-5.1 speeds up coding with adaptive and no-reasoning modes.
New prompt caching cuts API costs for embedded app developers.
New tools make AI agents more capable inside modern IDEs.
OpenAI is back with a new 5.1 update to its previous GPT-5 large language model. GPT-5 was introduced in August, which is decades ago in AI's time warp-speed version of our universe.
OpenAI is, of course, using AI to help it code faster. After all, it's in a race with the other big players to get that trajillion-dollar valuation. Besides, it's been proven beyond a shadow of a doubt that AI coding, in the hands of a professional coder, is an almost magical force multiplier and project accelerator.
(Disclosure: Ziff Davis, ZDNET's parent company, filed an April 2025 lawsuit against OpenAI, alleging it infringed Ziff Davis copyrights in training and operating its AI systems.)
Also: OpenAI's GPT-5.1 makes ChatGPT 'warmer' and smarter - how its upgraded modes work now
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