Anthropic says Claude Code cut 80% of its system prompt with no coding loss
petrusenko_max · x · 2026-07-26
Anthropic says it cut more than 80% of Claude Code’s system prompt for Claude Opus 5 and Fable 5 without hurting coding performance.
The implication is that the models can rely less on brittle prompt rules and more on:
- context
- memory
- skills
That makes the product easier to maintain and suggests a shift away from heavy prompt scaffolding in agent workflows.
Related event: Anthropic Slashes Claude Code System Prompts by Over 80%(11 posts)→
More from coding & agent
- Firecrawl offers 2.5x credits to a16z Speedrun founders, unveils $75M Series B — devdigest · 2026-10-27
- Chums: open-source Apple Watch app puts Claude Code and Codex on your wrist — brandon_galang · 2026-10-27
- Open-source Clairic Studio turns pasted text into typed data and working code in 5 languages — dfinke · 2026-10-27
- Matt Pocock shares expand/contract trick: split one-way-door PRs to de-risk big changes — mattpocockuk · 2026-10-27
- Qdrant builds Universal I/O to run vector search mmap code on object storage — qdrant_engine · 2026-10-27
- theo publishes tstack skills, Garry Tan urges everyone to 'publish your stack' — ycombinator · 2026-10-26