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Practical guide for ChatGPT Plus and Pro subscribers — regional pricing, payment methods (including solutions for users in regions where Stripe/OpenAI don't accept local cards), renewal strategy, account-safety checklist, and Plus-vs-Pro decision help. Use this skill when the user asks about ChatGPT Plus/Pro pricing in different countries, how to pay for ChatGPT from a region where their card is rejected, whether to upgrade to Pro, how to avoid account suspension, or how to compare ChatGPT with other AI subscriptions.

Estimate and compare LLM API costs across providers (OpenAI, Anthropic Claude, Google Gemini, DeepSeek, Mistral, Cohere). Includes per-token pricing, batch/caching discounts, workload templates for common scenarios (chatbot, RAG, summarization, code review), and a cross-provider comparison matrix with per-use-case recommendations. Use this skill when the user asks about API token costs, wants to compare model pricing, needs a monthly cost estimate, or asks which model is cheapest for their use case.