Source: https://ailoot.ai/blog/en/page/4/
Canonical: https://ailoot.ai/blog/en/page/4/
Language: en

# Guides to AI models and API integration

Guides to AI models, agents and the Ailoot API.

- [**Payment for an AI service declined: card, processor, and account** Checking the service terms, card and company billing, the difference between payment and access, a temporary hold, and choosing the right product.](https://ailoot.ai/blog/en/ai-service-card-declined/)
- [**How to undo changes in Claude Code: /rewind and git** Rewind modes, checkpointing limitations, git checkout, stash, reflog, and protection against destructive commands. Five ways to restore a state.](https://ailoot.ai/blog/en/claude-code-undo-changes/)
- [**How to Upgrade from Free Claude to Pro in 2026** How Claude Pro differs from the free plan, how much it costs, when you need it, how to upgrade, keep your data, and cancel your subscription.](https://ailoot.ai/blog/en/claude-free-to-pro-upgrade/)
- [**Claude Code Recovery: Safe Mode, /cd, and Fallback** Diagnosing Claude Code with safe mode, the /cd command, fallback models, and settings recovery. The order of checks and original limitations.](https://ailoot.ai/blog/en/claude-code-safe-mode-recovery/)
- [**Qwen Code AI API key: issue, connect and calculate usage** What is an AI API key for Qwen Code, how it differs from a subscription, where to issue one, how to configure settings.json, and what determines token usage.](https://ailoot.ai/blog/en/qwen-code-api-key/)
- [**How to Top Up Your Claude Console Balance in 2026** Where the top-up button is in Claude Console, how credits and auto-reload work, which roles are needed, and where to check supported countries. A review based on Anthropic documentation.](https://ailoot.ai/blog/en/top-up-claude-console-credits/)
- [**AI API pricing in 2026: token costs, comparison and budget calculation** AI API pricing with numbers: why output costs more than input, how to estimate tokens for a request and when the cache discount actually cuts the bill.](https://ailoot.ai/blog/en/api-token-usage-calculation/)
- [**How to Open Your Site to ChatGPT, Claude, and Perplexity Search Crawlers** Names of search and training crawlers, a complete robots.txt example, sitemap, text availability, and citation limitations.](https://ailoot.ai/blog/en/ai-search-crawlers-robots-txt/)
- [**FrontierCode Diamond: 13.4% mergeable patches on 50 hard tasks** The June 2026 FrontierCode results: 13.4% on Diamond’s 50 hard tasks versus 51.8% on Extended, and how to inspect an AI-generated patch.](https://ailoot.ai/blog/en/frontiercode-benchmark-mergeable-ai-code/)
- [**How to migrate from Claude Code to Codex in 2026: a step-by-step guide** Codex can import supported Claude Code setup. Check instructions, skills, MCP connections, hooks, and workflows against an inventory; manual work depends on your setup.](https://ailoot.ai/blog/en/migrate-claude-code-to-codex/)
- [**Images and fonts in a product: sources and licenses** Unsplash, Pexels, Google Fonts, and paid licenses: terms of use, attribution, and checking the rights for each file.](https://ailoot.ai/blog/en/images-fonts-licenses/)
- [**GitHub Code in a Commercial Product: Licenses and What to Check** Permissive licenses MIT, Apache, and BSD, copyleft GPL/AGPL, the absence of a LICENSE file, and checking the origin of code added by AI.](https://ailoot.ai/blog/en/github-code-commercial-licenses/)
- [**Your Own Claude Subscription vs a Ready-Made Account: Key Differences** How paying for your own subscription differs from buying a ready-made account, what risks of transferring access Anthropic describes, and what to check with an intermediary.](https://ailoot.ai/blog/en/claude-subscription-vs-bought-account/)
- [**Parallel Claude Code Work: worktree, Agents, and Workflows** Four layers of parallel Claude Code work, git worktree isolation, outcome verification, GUI tools, and limits on workload and tokens.](https://ailoot.ai/blog/en/claude-code-parallel-worktree-agents/)
- [**n8n vs Claude Code in 2026: what to choose for automation** A comparison of n8n and Claude Code: when no-code hits its ceiling, how to migrate a working flow to an AI agent, pricing, and 6 signs it’s time to move on.](https://ailoot.ai/blog/en/n8n-vs-claude-code-automation/)
- [**Alibaba’s Open Code Review: installation and your first review** Set up a model for Open Code Review, check Git changes, and review the findings. Delegation mode uses your agent’s model.](https://ailoot.ai/blog/en/alibaba-open-code-review/)
- [**OpenCode Install Guide: AI API Providers, Setup, and Models** For an OpenCode install Linux users can run the native script. The OpenCode install npm method also works with bun, pnpm, and yarn.](https://ailoot.ai/blog/en/opencode-installation-models/)
- [**Claude in the App Store: Payment, Restoring a Purchase, and Refunds** Apple Pay, Apple Account, and the App Store: the differences, linking a Claude subscription, Restore Purchase, USD prices in the US store, and cancellation and refund rules.](https://ailoot.ai/blog/en/claude-app-store-payment-refund/)
- [**Devin: Plans, Payment Conditions, and Reasons a Card Is Declined** What you pay for in Devin, Free/Pro/Max/Teams plans, the difference between access problems and a card decline, credits, and refund rules.](https://ailoot.ai/blog/en/devin-tariffs-payment-card-declines/)
- [**Opus 4.8 in Claude Code: What’s New, Pricing, and How to Switch in 2026** What changes in Claude Code with Opus 4.8 on May 28, 2026: Dynamic Workflows, xhigh effort, Fast Mode. Exact prices, benchmarks, decision matrix.](https://ailoot.ai/blog/en/opus-4-8-claude-code-features/)
- [**Response styles in Claude Code: how to switch and create your own** What output styles in Claude Code are and how they differ from CLAUDE.md: four built-in styles, switching via /config, and how to write your own.](https://ailoot.ai/blog/en/claude-code-output-styles/)
- [**PDFs in Claude Code: Conversion, Tokens, and Preserving Structure** MarkItDown, PyMuPDF4LLM, MCP, complete conversion scripts, PDF limits, and cases when visual analysis matters more than token savings.](https://ailoot.ai/blog/en/pdf-claude-code-markdown/)
- [**Claude Code can’t see project files: why and what to do in 2026** Why Claude Code can’t find project files: it was started from the wrong folder, the file is in a subfolder, or it’s in .gitignore. How to grant access with add-dir, cd, and settings.](https://ailoot.ai/blog/en/claude-code-cant-see-project-files/)
- [**Why Claude Code rereads the entire project and how to fix it** Claude Code doesn’t index code and rereads the project from scratch, burning tokens. How to give it persistent code memory via MCP and reduce usage.](https://ailoot.ai/blog/en/claude-code-rereads-project/)
- [**Why Claude Does the Wrong Thing: 3 Prompts** Claude writes the wrong thing because it rushes into code without understanding your intent. I explain why and give you 3 ready-to-use prompts to make it ask questions first.](https://ailoot.ai/blog/en/why-claude-does-the-wrong-thing/)
- [**Why an AI agent says “done” when the work isn’t finished** Reward hacking, completion criteria, independent acceptance, and two ready-to-use prompts for checking the actual result.](https://ailoot.ai/blog/en/ai-agent-says-done/)
- [**Email for Claude: choosing an address and protecting access** Sign in with Google or email, email delivery, inability to change your address, a corporate domain, and preserving account access.](https://ailoot.ai/blog/en/claude-registration-email/)
- [**Website Design with an AI Agent: Claude Code and Refero DESIGN.md** Refero Styles design context: DESIGN.md structure, choosing a visual system, importing it into CLAUDE.md, four steps to create a page, and common mistakes.](https://ailoot.ai/blog/en/claude-code-refero-design-md/)
- [**Qwen 3.7 and 3.7 Max: what the model for coding can do in 2026** Qwen 3.7 versions and regional prices from Alibaba documentation, vendor-reported comparisons, evidence limits, and a pilot for measuring real task cost.](https://ailoot.ai/blog/en/qwen-3-7-max-coding/)
- [**Qwen Code stopped working: why and what to do in 2026** I explain why Qwen stopped working: free access was closed, chat and terminal got confused, and there was a 401 error. How to get the agent working again without a card.](https://ailoot.ai/blog/en/qwen-code-stopped-working/)
- [**Claude Registration: Phone and Identity Verification** A number from a supported country, SMS verification, restrictions on virtual numbers, separate Persona verification, and the differences between registration, access, and payment.](https://ailoot.ai/blog/en/claude-registration-phone-verification/)
- [**AI coding agent rankings in 2026: who actually solves tasks** Detailed analysis: AI coding agent rankings in 2026: who actually solves tasks.](https://ailoot.ai/blog/en/ai-coding-agent-rankings/)
- [**Routines in Claude Code: 5 ready-to-copy routines** Routines in Claude Code 2026: 3 trigger types (cron/webhook/GitHub), 5 ready-to-copy routines, plan limits, and step-by-step setup.](https://ailoot.ai/blog/en/claude-code-routines/)
- [**Security review in Claude Code: step-by-step guide and GitHub Action automation in 2026** How to check the security of a vibe project with /security-review in Claude Code. Setup steps, a GitHub Action template, 6 types of vulnerabilities, and honest limitations.](https://ailoot.ai/blog/en/claude-code-security-review/)
- [**How much does vibe coding cost: subscription, services, and time for revisions** Claude Code pricing in your project budget: subscription charges, connected services, hosting, and time spent checking and revising the result.](https://ailoot.ai/blog/en/vibe-coding-cost-time/)
- [**Should you buy a ready-made Claude account in 2026: what you risk** Based on Anthropic's documents, I examine the risks of buying someone else's Claude account: losing access, losing money, and getting blocked. And why your own account is more reliable.](https://ailoot.ai/blog/en/buying-claude-account-risks/)
- [**Ultracode in Claude Code 2026: how to enable it with one command** Ultracode in Claude Code: a mode where Claude launches a team of agents itself. How it differs from /effort xhigh, how to enable it, and how quickly it burns through tokens.](https://ailoot.ai/blog/en/ultracode-claude-code/)
- [**utm\_source=chatgpt.com: how to measure traffic from ChatGPT** UTM tag and referrer, a segment in Metrika, landing pages, GA4, and the roles of OAI-SearchBot, GPTBot, and ChatGPT-User.](https://ailoot.ai/blog/en/utm-source-chatgpt-com/)
- [**WhatsApp Business Tools MCP: how to connect WhatsApp Business to an AI agent** Meta's official MCP server for WhatsApp Business: what the agent can do, the connection command in Claude Code, setup in Codex and ChatGPT, and beta version limitations.](https://ailoot.ai/blog/en/whatsapp-business-mcp/)

## Ailoot · The company and its project portfolio





Ailoot combines established operating experience, a large client base, stable service and ongoing KPI control.





The company and its project portfolio: millions of customers; monthly sales in the billions.





Ailoot brings that operating experience to API access for AI features in customer products, agents, applications and automations.