Claude AI Guide: Tips, Tutorials & Best Practices

In April 2026, Anthropic Claude Opus 4.7 and OpenAI GPT-5.5 shipped one week apart. Opus leads on real codebase work (SWE-bench Pro 64.3%); GPT-5.5 leads on terminal control and customer support (Terminal-Bench 82.7%, OSWorld 78.7%) — almost mirror-image strengths. And while Opus has the lower sticker price, output token volume often makes GPT-5.5 about a quarter the real-world cost on the same task. This article lays out the spec sheet, benchmark deep dive, token-economics, strengths-and-weaknesses map, use-case picks, and a dual-vendor strategy, all grounded in official sources and third-party evaluations.

Claude Mythos Preview, released by Anthropic in April 2026, hit Firefox JavaScript engine exploit success rates 90× higher than Opus 4.6 and uncovered thousands of zero-days across OpenBSD, FFmpeg, and the Linux Kernel. Anthropic chose not to release it publicly, instead adopting "Project Glasswing" — limited delivery to partners like AWS, Google, and Microsoft. This article maps the new terrain of AI cybersecurity Mythos has revealed: attacker automation, AI on the defender side, regulatory response, and the actions organizations should take, all grounded in the latest data.

The center of gravity has shifted from prompt engineering to harness engineering — the new battleground of the AI agent era. This article lays out what harness engineering actually is, how it differs from prompt engineering, the six components (tool definition, context management, memory, loop, guardrails, output UX), a side-by-side comparison of Claude Code, Cursor, Codex CLI, and Devin, and a practical design checklist — the foundation you need to use or build AI agents seriously.

AI agents (Claude Code, Cursor, Copilot, Codex) ignoring your .md rule files comes down to 5 root causes: context-window limits, auto-compact diluting early instructions, fuzzy priority, vague phrasing, and bloated scattered files. This article walks through diagnostics, quick wins (compress to under 150 lines, priority markers), and longer-term systemization with Claude Code Hooks, sub-agents, and custom slash commands — plus tool-specific best practices.

On April 16, 2026, Anthropic released Claude Opus 4.7. High-resolution image support (up to 2576px), a new xhigh effort level, task budgets (beta), a new tokenizer, a 1M context window, and pricing held at $5/$25 per MTok --- coding, agents, and vision tasks all see major improvements. There are also breaking changes (extended thinking and sampling parameters are gone). This article covers the new features, behavioral changes, how it compares to Opus 4.6, and when you should reach for it.

Claude Opus 4.7 shipped, and migrating from 4.6 comes with several breaking changes: extended thinking (enabled) is gone, temperature/top_p/top_k are gone, the new tokenizer produces up to 1.35x more tokens, thinking content is hidden by default, and prefill is gone. This article walks through every breaking change with Python and TypeScript Before/After snippets, behavioral changes, recommended settings, and a line-by-line migration checklist.

Claude offers three models — the top-tier Opus, balanced Sonnet, and fast low-cost Haiku. API output pricing ranges from $25/MTok (Opus) to $5/MTok (Haiku), a 5x difference. But how big is the performance gap? This guide compares pricing, benchmarks, and real-world cost estimates to help you pick the right model.

You've enabled --dangerously-skip-permissions, yet Claude keeps asking for confirmation in the chat. This isn't a bug — Claude Code has two independent permission layers, and bypass only controls one of them. Here's what's actually happening.

Ever been surprised how quickly Claude Code burns through tokens? This article explains why token consumption is so high, shares 10 practical saving techniques, and breaks down what happens when you hit the limit and how extra costs work across Pro, Max, and API plans.

Claude Code has a "bypass permission mode" that executes all operations without confirmation. While it's useful for CI/CD pipelines and containerized environments, misuse can lead to prompt injection attacks, data leaks, and irreversible damage. This guide covers the 5 permission modes, specific risks, and how to use bypass mode safely.

Claude Code and Codex are the two biggest names in AI coding tools. Which one is right for you? We compare them across three key dimensions: pricing, performance, and best use cases.

A complete comparison of Claude (Anthropic) and ChatGPT (OpenAI) pricing as of March 2026. Discover which plan is right for you across three dimensions: free tiers, monthly subscriptions, and API pricing.