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Practical notes on AI models, API costs, and production workflows.

Model updates, integration guides, pricing breakdowns, and tool workflows for developers and teams.

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DeepSeek, Gemini, and Claude Free Hong Kong Access: What Is Available?
October 13, 2026158 viewsEnglishGuide

DeepSeek, Gemini, and Claude Free Hong Kong Access: What Is Available?

Separate chatbot availability from developer API access in Hong Kong, and check current provider eligibility before relying on a free option.

gemini 3 pro api pricing per million tokens
October 13, 2026158 viewsEnglishGuide

gemini 3 pro api pricing per million tokens

Gemini 3 Pro Preview is shut down on Google's API. Separate that retired identifier from Gemini 3.1 Pro and compare current token rates correctly.

How to access all AI models with single API key
October 13, 2026113 viewsEnglishTutorial

How to access all AI models with single API key

Use a model gateway to share one key across supported providers, without confusing a common endpoint with universal model access.

Claude API Development Plans 2026: Billing, Credits, and Project Budgets
October 12, 2026116 viewsEnglishGuide

Claude API Development Plans 2026: Billing, Credits, and Project Budgets

Choose a Claude API billing route, check account-specific credits, and budget development with measured token usage instead of chat-subscription assumptions.

How to get a Claude API key outside the US?
October 12, 2026121 viewsEnglishTutorial

How to get a Claude API key outside the US?

Check regional eligibility, create the right developer key, and distinguish direct Claude access from a gateway account before writing code.

Claude tool_use_id Errors: Fix Missing and Misordered tool_result Blocks
October 11, 2026166 viewsEnglishTutorial

Claude tool_use_id Errors: Fix Missing and Misordered tool_result Blocks

Fix Claude tool_use_id and tool_result errors with valid message pairs, a runnable native tool loop, and a local validator for missing, duplicate, and misordered results.

Incremental Embeddings: Deduplication, Checkpoints, Updates, and Deletes
October 11, 2026215 viewsEnglishTutorial

Incremental Embeddings: Deduplication, Checkpoints, Updates, and Deletes

Build a resumable incremental embedding index in Python and SQLite. Deduplicate text, checkpoint vectors, publish atomic updates, and handle deletions safely.

Claude Prompt Cache Not Working? Diagnose Prefixes, TTL, and Usage
October 11, 2026188 viewsEnglishTutorial

Claude Prompt Cache Not Working? Diagnose Prefixes, TTL, and Usage

Diagnose Claude prompt-cache misses using real cache-write and cache-read token counts. Reproduce a controlled test and separate prefix issues from routing hypotheses.