Anthropic ships Claude Opus 5.5 with lower pricing and a guide to cutting API costs
RLanceMartin · x · 2026-09-23
Anthropic has released Claude Opus 5.5, touting stronger coding, better writing, and reduced pricing. Migration is push-button: run /claude-api migrate in the latest Claude Code to update app code, and /claude-api prompt-audit to tune skills and prompts.
Lance Martin's updated official blog argues cost and performance aren't a forced trade-off. Three fixes let most Claude Platform apps cut costs without losing quality:
- Maximize prompt cache hit rate — prefill is the expensive part of input; caching the KV state avoids paying it repeatedly
- Remove prompt anti-patterns when upgrading to frontier Claude models
- Calibrate effort to the task instead of always maxing out
The guidance ships in the claude-api skill so Claude Code can find savings automatically. Benchmarks originally run on Opus 5 / Sonnet 5 have been re-run to reflect Opus 5.5, which launched September 22, 2026.
Related event: Anthropic Launches Claude Opus 5.5: Stronger, 40% Cheaper, Tops AA Index(259 posts)→
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