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Guide for using Anthropic Claude model API
On June 9, 2026, Anthropic dropped two names at once: Claude Fable 5 and Claude Mythos 5. Many assumed these were two distinct models, but in reality, they are two different wrappers for the same underlying model. What truly separates them isn't their capability, but their safety policy. This article answers one question: What is … Read more
If you're selecting a Claude API gateway for a Hong Kong-based AI project, there's a critical piece of news from May 2026 you need to know: On April 29, Goldman Sachs revoked all Hong Kong employees' access to Anthropic's Claude. This wasn't just a routine vendor change; it was a "strict interpretation" made by Goldman … Read more
Expert programmers have combed through the 232-page official Anthropic system card, and the conclusion is unanimous: Claude Opus 4.7’s long-context performance has seen a significant regression compared to 4.6. This finding stands in sharp contrast to the phrasing in Anthropic’s official blog, which claimed, "Opus 4.7 delivered the most consistent long-context performance of any model … Read more
Within 48 hours of its launch, discussions around Claude Opus 4.7’s "writing degradation" exploded on Hacker News, with a top-ranking thread bluntly titled: "Opus 4.7 is horrible at writing". Countless developers and academic writers have confirmed: the model’s ability to write in Chinese has visibly regressed, and its English output has collapsed alongside it. More … Read more
When you ask Claude Code to fetch http://www.weather.com.cn and get the same red error five times in a row: Unable to verify if domain www.weather.com.cn is safe to fetch. This may be due to network restrictions or enterprise security policies blocking claude.ai., it looks like a "network/firewall blocking claude.ai" issue. But that’s not the truth—this … Read more
If you've been hearing the name "Project Glasswing" lately but aren't sure how it connects to Claude, Anthropic, or the Mythos Preview, this guide is for you. Project Glasswing is an AI cybersecurity alliance launched by Anthropic on April 7, 2026, in partnership with 11 global tech giants. Its goal is to use Claude Mythos … Read more
"Why does my Claude Code request 400k input tokens every time? Why is my bill so high?"—this is the first reaction many Claude Code users have when checking their usage stats. In reality, the vast majority of those 400k tokens have likely been cached, and the actual cost might only be 1/10th of the surface … Read more
Ever run into this situation: you're using the claude-opus-4-6-thinking model, and calls via /v1/chat/completions (OpenAI format) work perfectly fine, but when you switch to /v1/messages (Anthropic native format), you get the error content: Input should be a valid list? This seemingly counterintuitive phenomenon actually reveals a deep compatibility issue with the Thinking model across the … Read more
By 2026, 92% of developers are already using AI programming tools, with 41% of code being AI-assisted. However, there’s an awkward reality: while developers report saving 30-60% of their time, actual organizational productivity has only increased by about 10%. Where’s the gap? It’s the workflow. If you use the right model combinations and workflows, AI … Read more
title: "Claude Code Prompt Caching: TTL Mechanics, Costs, and Optimization Strategies" description: "A deep dive into Claude Code's prompt caching TTL, the differences between 5-minute and 1-hour tiers, and how to optimize costs across Anthropic API and AWS Bedrock." Author's Note: This guide breaks down the TTL mechanism for Claude Code prompt caching, explains the … Read more
