Guide for using OpenAI GPT series model API
Many Hong Kong companies face the same awkward situation when building AI applications: they want to use GPT-5.5 and run OpenAI APIs, but a quick check of the official website reveals that Hong Kong isn't on the supported regions list. When they try to handle payments, their Hong Kong-issued credit cards get blocked by Stripe….
Many users encounter the same issue when generating images via the gpt-image-2 API or the ChatGPT website: while the model is excellent at text recognition, the fonts are always that "engineer-aesthetic" plain sans-serif, lacking any brand identity or design flair. This "plain aesthetic" is especially noticeable when creating posters, social media covers, or product marketing…
After OpenAI released the official GPT 5.5 prompt guide, the most notable change wasn't a specific new prompt template, but a fundamental shift in the overall approach to prompt design. In the past, many developers were accustomed to writing lengthy system prompts. These prompts typically listed detailed workflows, fixed steps, mandatory tones, prohibitions, tool invocation…
In late April 2026, OpenAI introduced a feature via Codex CLI 0.128.0 that has the developer community buzzing: Codex Goal mode (/goal). This isn't your typical "one prompt, one response" interaction; it's a genuine autonomous agent loop. You set a goal (e.g., "Migrate this Python project from Pydantic v1 to v2 and ensure all tests…
Recently, many users have run into a "phone number verification required" prompt when switching devices, reinstalling Codex, or logging back into the Codex CLI or desktop app. The most frustrating part is that many of these accounts worked perfectly fine with Codex before—some have even been using ChatGPT for a long time—only to suddenly be…
Author's Note: OpenAI's cheapest model, gpt-5.4-nano, is priced at just $0.20/$1.25. With a Ï„2-Bench score of 92.5%, it’s nearly on par with the mini model. This article provides a detailed breakdown of the 7 best use cases for nano, when you should swap it for mini, and an ultimate optimization strategy using 90% discount caching….
Author's Note: OpenAI's latest mini series model, gpt-5.4-mini, is now available via API. It achieves 54.4% on SWE-Bench Pro, outperforming the GPT-5 mini's 45.7%. This article provides a comprehensive breakdown of its performance leap, the 90% discount on cached inputs, and how to choose between 4o-mini, 5-mini, and this new upgrade. If you're still using…
Author's Note: OpenAI's latest gpt-5.5-pro model is now officially available via API, featuring a 1M context window and top-tier reasoning capabilities. This article provides a comprehensive breakdown of its technical specifications, pricing structure, SVIP group restrictions, and access solutions for domestic users. OpenAI officially released GPT-5.5 on April 23, 2026, and opened the gpt-5.5-pro advanced…
The most overlooked detail in AI image generation is dimensions. With the same prompt, choosing the wrong aspect ratio can ruin your composition; with the same content, picking the wrong resolution can inflate your costs by 10x. OpenAI's official gpt-image-2 pricing model is tiered by "quality level × resolution." A 1024×1024 high-quality image costs $0.211,…
Author's Note: I'll walk you through how to connect gpt-image-2 in Chatbox using a custom endpoint, and dive deep into why Chatbox can't perform the continuous, iterative image editing you see in the ChatGPT web interface. The secret lies in the architectural differences between the images/generations, chat/completions, and Responses API endpoints. Many users have configured…
