How to Control Claude Code API Costs With Token Budgets and Smarter Caching

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Production teams using Claude Code often face runaway API costs driven by silent context accumulation and cache invalidation that standard billing dashboards fail to surface. Conversation histories can quietly balloon from 10,000 to 200,000 tokens across multi-turn sessions without any code changes, causing monthly token spend to double. Anthropic's billing interface shows aggregate input and cached token counts but omits per-session context growth and the cascading expense triggered when a cache invalidates mid-session. Experts recommend enforcing hard token budgets at the request level before API calls are made, rather than relying on reactive alerts after costs have compounded. Complementary strategies include prompt caching with explicit TTL tracking and context managers that summarize or truncate conversation history at fixed intervals to prevent unbounded spend.

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