Articles
Industry news, technical articles, and product introductions
📚 Claude Tutorials Hub
40+ step-by-step Claude guides — prompt engineering, Claude Code, API, agents. Browse by topic →
Loading...
Anthropic Deleted 80% of Claude Code's System Prompt. The Evals Didn't Move.
'We removed over 80% of Claude Code's system prompt' — and the evals didn't move. The popular takeaway ('write shorter prompts') is wrong: what got deleted was constraints, not information. A usable dividing line, plus the API-layer mechanics the official post left out and the two real disagreements from 343 HN comments.
prompt-engineeringclaude-code+5
ai-tutorialsJul 27, 202613 min
551
Claude Prompt Caching Guide: Reduce Repetition, Cost, and Latency
How to use Claude prompt caching to reuse static context, reduce repeated input costs, and keep long prompts faster. Includes a hands-on benchmark: the same 63KB system prefix sent 21 times, cost per request dropping from $0.0719 to $0.0058 (91.9%) on a cache hit, while time to first token improved by only about 150ms.
claudeapi+2
ai-tutorialsMar 29, 202611 min
950