Claude API

Guide for using Anthropic Claude model API

Claude Opus 4.7 long context capability regression test: 3 truths behind the halving of the MRCR benchmark

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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

Claude Opus 4.7 writing ability regression test: 7 scenarios verifying why it no longer speaks like a human

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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

Complete Troubleshooting for Claude Code WebFetch Error: 4 Steps to Resolve Unable to verify if domain Issue

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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

What is Project Glasswing? Understand the Anthropic 12-Giant Alliance in 5 minutes

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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

Claude Code cache hit rate increased to 95%: 6 practical tips to reduce 400,000 tokens of input to 50,000

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"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

Resolving Claude Opus 4.6 Thinking Model API Errors: A Complete Analysis of Format Compatibility Issues Between /v1/messages and /v1/chat/completions

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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

AI Programming Workflow Revolution: A 6-Step Practical Guide Using GLM-5 for Coding and Claude Sonnet 4.6 for Review

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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

Claude Code prompt caching TTL full interpretation: 5 minutes vs 1 hour, which one to choose? Includes billing comparison for 3 platforms

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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

OpenAI Compatible Mode vs Claude Native Format: 7 Key Differences That Determine Which Access Method You Should Use

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Author's Note: A detailed comparison of 7 key differences between OpenAI-compatible mode and the native Claude API format, including support for features like Prompt Caching, Extended Thinking, and tool calling, to help you choose the most suitable integration method. Using the OpenAI SDK to call Claude models by just changing the base_url seems convenient—but you … Read more

Claim $1200 Worth of Claude Max 20x: Application Guide for Open Source Maintainers for 6 Months of Free Use

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Author's Note: Anthropic has launched the Claude for Open Source program, offering open source maintainers 6 months of free Claude Max 20x. There are 10,000 spots available, including all premium features like Claude Code and Cowork. This article details the eligibility criteria and application steps. Anthropic has officially launched the Claude for Open Source program, … Read more