# Anthropic — Reducing cost and improving performance with Claude Platform

- Company: Anthropic (anthropic.com)
- Announced: 2026-09-08
- Category: capability-change
- Coverage: 9 outlets
- Announcement: yes
- Group: covered
- Source: https://claude.com/blog/reducing-cost-and-improving-performance-with-claude-platform
- Record: https://forck.live/items/9290-reducing-cost-and-improving-performance-with-claude-platform
- Subject: Claude
- Models affected: Opus 5, Fable 5.1

Anthropic published guidance on reducing costs with Claude Platform by optimizing prompt caching, removing anti-patterns from prompts, and calibrating effort to the task. The post notes that only select Claude models, including Opus 5 and Fable 5.1, allow updating effort mid-conversation without breaking the cache.

## Evidence

Verbatim from https://claude.com/blog/reducing-cost-and-improving-performance-with-claude-platform:

> Tuning prompt caching, instructions, and effort can reduce Claude's cost without sacrificing application performance.

## Around this story

Outlets this record can name and link:

- Quartz: https://qz.com/anthropic-claude-biological-weapons-surveillance-misuse-091026
- Engadget — Anthropic caught scientists using Claude to further biological weapon research: https://engadget.com/2255473/anthropic-caught-scientists-using-claude-to-further-biological-weapon-research
- Ars Technica — Claude users found ways around safeguards for bioweapons research: https://arstechnica.com/ai/2026/09/claude-users-found-ways-around-safeguards-for-bioweapons-research
- International Business Times — Anthropic Says It Blocked Claude Users From Researching Biological Weapons. They Sought To Evade Restrictions.: https://ibtimes.com/anthropic-says-it-blocked-claude-users-researching-biological-weapons-they-sought-evade-3807359
- Thehill: https://thehill.com/policy/technology/anthropic-ai-claude-bioweapons
- Tom's Guide: https://tomsguide.com/ai/anthropic-says-it-blocked-researchers-using-claude-for-possible-bioweapon-research
- The Indian Express: https://indianexpress.com/article/world/anthropic-blocks-weapons-claude-ai-china-russia-weapons-10872835
- The Independent — Anthropic warns misuse of its AI may have led to bioweapons development: https://the-independent.com/tech/anthropic-claude-bioweapons-development-ai-misuse-b3048341.html
- Gadget Review — Anthropic Says Claude AI Blocked Biological Weapons Attempts: https://gadgetreview.com/anthropic-says-claude-ai-blocked-biological-weapons-attempts

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