The Hidden Cost of Claude Code: Don't Make This Mistake!

Claude Code prompt cache explained with a measured test: switching from Opus 5.5 to Haiku 5.5, lowering effort, taking a break and the /advisor setting, 27 runs on the same bug. The cheaper model's easy question cost 14 cents against 3.5 cents on Opus. ---- Higgsfield AI — Create AI Videos & Visuals Get 10% OFF here: https://higgsfield.ai?fpr=thomas-dccf7e 🚀 DYNAMOUS AI COMMUNITY Want to learn agentic coding with live daily events and workshops? Check out Dynamous AI: https://dynamous.ai/?code=646a60 Get 10% off here 👉 https://shorturl.smartcode.diy/dynamous_ai_10_percent_discount ⚡ HOSTINGER — RELIABLE HOSTING FOR YOUR PROJECTS (10% OFF) Whether you're shipping a portfolio, a side project, n8n flows, or AI agents — I use Hostinger for fast, affordable VPS + web hosting. Get 10% off here 👉 https://hostinger.com/DIYSMARTCODE n8n: https://n8n.partnerlinks.io/diysmartcode (Affiliate links — costs you nothing, supports the channel.) ---- Chapters 0:00 Claude Code Haiku vs Opus: Same Question, 3.5¢ vs 14¢ 0:37 Claude Code Prompt Cache Explained: Each Model Has Its Own Cache 1:12 How I Tested It: Express Bug, 155k Tokens, 27 Runs 2:01 Does Switching Models Cost More? Haiku Then Back to Opus 2:40 Claude Code Prompt Cache Expired: The Break Costs 10x 4:01 Does Lowering Effort Save Tokens? Opus 5.5 Effort Test 4:31 Claude Code /advisor Cost: Sonnet + Opus Advisor Tested 5:30 Cheapest Model for the Whole Job: Opus vs Sonnet vs Haiku Cost 6:03 Verdict: Pick the Model Before the Job Starts What you will see in this 6-minute breakdown: - Why each model keeps its own prompt cache and what /model does to it - The same easy question on Opus 5.5 (3.5 cents) and after a Haiku 5.5 switch (14 cents) - That switching back inside the cache lifetime works, and that the expensive part is the idle gap (75 to 82 cents for the fix, against 8 cents) - Lowering effort keeps the cache but saved nothing consistent on a one-line question - One /advisor consult at 155k tokens: 67 to 69 cents, advisor never called unless asked - Whole job: Opus 5.5 $1.53, Sonnet 5.5 $0.76, Haiku 5.5 $0.20, all 27 runs fixed the bug Test setup: Express v5.3.0 demo copy with one planted bug, Claude Code 2.1.302, clean config, 3 runs per setup, costs are Claude Code's list prices (on a plan you spend usage limits instead of dollars). Prompt caching in Claude Code (docs): https://code.claude.com/docs/en/prompt-caching Advisor tool (docs): https://code.claude.com/docs/en/advisor Model configuration and effort (docs): https://code.claude.com/docs/en/model-config Optimizing for cost and intelligence (Anthropic guide): https://platform.claude.com/docs/en/about-claude/models/optimizing-for-cost-and-intelligence Do you start every job on Opus, or on the cheapest model that can finish it? #ClaudeCode #Claude #Anthropic #PromptCaching #ClaudeOpus #ClaudeHaiku #ClaudeSonnet #Opus55 #Haiku55 #AICoding #ClaudeCodeTips #TokenUsage #UsageLimits #LLMCost #DevTools #AgenticCoding #ClaudeAdvisor #AIAgents