Guide for using OpenAI GPT series model API
OpenAI launched a limited preview of the GPT-5.6 series on June 26, 2026, bringing three models at once: the flagship Sol, the balanced Terra, and the high-speed, low-cost Luna. Most coverage has focused on Sol’s max reasoning and ultra mode, but for the vast majority of developers, the one that’s actually usable right away and…
Many people have a misconception when they first use the ChatGPT web interface: they input a PDF or a single sentence, and "pop"—it spits out five images with a consistent style. However, once you switch to the API and set the n parameter to 5, you end up with five variations that look largely the…
The biggest cost sink in running LLM applications isn't output tokens—it's the redundant retransmission of system prompts and long documents. Both OpenAI and Anthropic have provided a solution: prompt caching. However, their billing philosophies are completely different: OpenAI follows a "zero-configuration, moderate discount" path, while Claude follows an "explicit declaration, deep discount" path. This article…
In May 2026, OpenAI quietly swapped the default model for ChatGPT to GPT-5.5 Instant. At the API level, this corresponds to a rather peculiar name: chat-latest. It lacks a version number or a date suffix—it’s just a fixed "latest" string. Yet, every time you call it, the underlying model might be silently changing behind the…
Author's Note: This article breaks down the technical upgrades of GPT-5.5's native browser-use capabilities, real-world Agent deployment scenarios, and how to get started. It includes performance benchmarks from OSWorld and Terminal-Bench, along with 5 typical application scenarios. Over the past two years, almost every "impressive" AI Agent demo has relied on a core capability: the…
Recently, a developer in our community asked a very specific question: "Can the gpt-image-2 API generate ultra-wide panoramas or ultra-tall vertical images like 1:8 or 8:1? I want to create stretch banners, panoramic scrolls, and long infographics." To put it bluntly: gpt-image-2 does not natively support 1:8 / 8:1; the most extreme it goes is…
I’ve recently been getting a lot of questions from developer clients: "Why does it take over 200 seconds to generate a 1024×1024 image with gpt-image-2? Is my account being rate-limited?" After taking a look at their code, I found they were using the default quality="high" and size="1536×1024". At that point, a 235-second generation time is…
Recently, the official OpenAI Cookbook, in collaboration with Fractional AI, released a highly practical, "hardcore" case study: using AI to automatically audit expense receipts. At first glance, it seems like a standard OCR task, but once you dive into the notebook, you realize it’s actually a masterclass in "taking AI applications from demo to production."…
Many developers, when first integrating the gpt-image-2 image editing API, instinctively POST the original image directly—after all, the official documentation clearly states a 50MB limit, so why not use it? However, after running a few dozen tests, you'll quickly realize that compared to a 1.5MB compressed image, uploading a 20MB original can result in generation…
Recently, a client asked us about the "Data Controls" page in their OpenAI dashboard. They noticed two toggles: "Share evaluation and fine-tuning data with OpenAI" and "Share inputs and outputs with OpenAI." Each has three options: Disabled, Enabled for all projects, and Enabled for selected projects. The first one features a green prompt saying, "You're…
