Creuto: AI Technology & Product Insights
Stay informed with practical insights from the Creuto team on artificial intelligence, custom software, mobile applications, SaaS development, product engineering, technology trends, and digital transformation.
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OpenAI Fast mode: when paying for 2.5x speed is worth it
Priority processing is now OpenAI Fast mode: up to 2.5x faster, at a premium that ranges from 1.75x to 2.5x by model. Here is the cost per saved second, and where Fast mode is wasted.
Akash Mohapatra
Sep 21, 2026
OpenAI ChatKit: the chat UI is done, the server is yours
OpenAI ChatKit remains available after Agent Builder shuts down on 30 November, but new apps need their own ChatKit server. Here is what ChatKit provides and what you still build.
Akash Mohapatra
Sep 21, 2026
OpenAI Batch API vs Flex: half price, different trade-offs
OpenAI Batch API and Flex processing charge identical half-price rates. Batch trades a 24-hour completion window for a separate rate-limit pool; Flex keeps synchronous calls but can return 429s. Here is how to choose.
Akash Mohapatra
Sep 21, 2026
whisper-1 deprecation: move to gpt-transcribe by 26 Feb 2027
OpenAI retires whisper-1 and three gpt-4o transcription models on 26 February 2027. gpt-transcribe is cheaper for files, but timestamps, subtitles, translation and diarisation have no documented replacement yet.
Akash Mohapatra
Sep 21, 2026
ChatGPT ads: what the OpenAI Ads API lets brands build
ChatGPT ads come with an Advertiser API, a product feed in OpenAI's own schema and a new Measurement Pixel. What the docs say e-commerce brands need in place before a campaign can optimise for sales.
Akash Mohapatra
Sep 21, 2026
OpenAI 429 error: slow_down is not the rate limit you think
Since 2 September, OpenAI returns a 429 slow_down when traffic ramps too fast, even under your limits, and a 503 server_is_overloaded when a model lacks capacity. How to tell them apart and retry correctly.
Akash Mohapatra
Sep 21, 2026
GPT-5 deprecation on 11 December: gpt-5 and o3 to GPT-5.6
On 11 December 2026 OpenAI removes gpt-5, gpt-5-mini, gpt-5-nano, gpt-5-pro, o3 and o3-pro. Here is the replacement map, the per-token price change on each row, and a test plan for the weeks left.
Akash Mohapatra
Sep 21, 2026
OpenAI data residency in India and the UAE: what stays local
OpenAI's India endpoint stores your data locally but can process it elsewhere; the UAE endpoint processes in-region for four models after extra approval. Here is what each option guarantees, what it costs and how to design around the gaps.
Akash Mohapatra
Sep 21, 2026
Prompt caching: the cheapest LLM cost cut most apps miss
Cached input costs a tenth of normal input on current OpenAI models, but cache writes cost 25% more. How prompt caching works, why it misses, and a worked saving from published prices.
Akash Mohapatra
Sep 21, 2026
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