10 min read
5 Claude API Errors That Cost Me Money (And How I Trapped Them)
Retry storms turned 1 timeout into 340 duplicate calls billed in 90 seconds
The Lab · Written in the open · Tagged API
Lab.
Working notes from the studio. The tools I build, the workflows I keep, the mistakes I paid for.
14 entries · latest 2026-10-01
Latest entry
Claude Sonnet 4.5 Retires November 30: What to Check Now
Anthropic deprecated Claude Sonnet 4.5 on September 30; API calls to it fail after November 30, 2026.
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TLDR
This entry in one minute
- Anthropic deprecated Claude Sonnet 4.5 on September 30, 2026, giving 61 days before retirement
- claude-sonnet-4-5-20250929 stops answering requests after November 30, 2026, no grace period after that date
- The recommended replacement is claude-sonnet-5-5, priced the same and sharing the 1M token context window
All entries · API
10 min read
Shopify Admin API From Claude: 5 Patterns I Use Across 15 Repos
Product create via Admin API beats clicking through the dashboard every time
10 min read
Claude Files API in Production: 5 Patterns for Document Workflows
Files API replaced my 40KB inline blobs with reusable file IDs across requests
11 min read
5 Anthropic Prompt Caching Patterns That Cut My API Bill 70%
System-prompt caching alone cut repeat-call costs by half
8 min read
5 Anthropic SDK Streaming Patterns I Use in Production
Token paint with backpressure stops fast streams from crashing slow UIs
8 min read
Hono: The Tiny Framework That Runs My Entire Backend
Hono ships under 14KB and runs the same code on Bun, Node, Deno, Cloudflare Workers, and Vercel Edge
10 min read
The 1M Context Window Actually Changes How I Code
Loaded my entire 12-repo studio into one session and stopped re-explaining context to the model every hour
9 min read
Claude Opus 4.6 vs 4.7: Every Difference Side by Side
Pricing stays identical at 5 USD per million input and 25 USD per million output, 1 million token…
8 min read
Claude Opus 4 and Sonnet 4 Retire June 15
Anthropic deprecated claude-opus-4 and claude-sonnet-4 on April 14 with retirement set for June 15
8 min read
Shopify April 2026 Breaking Changes: What Developers Must Fix
Shopify now requires expiring offline access tokens for all new public apps as of April 1
9 min read
Anthropic's Advisor Strategy: Opus Intelligence at Sonnet Prices
Anthropic's Advisor Strategy lets Sonnet or Haiku consult Opus mid-task, keeping near-Opus quality at executor-level pricing