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Anthropic's Claude prompt caching slashes API costs by up to 85%

By PulseAugur Editorial · [2 sources] ·

Developers can significantly reduce API costs for models like Anthropic's Claude by implementing prompt caching. This feature stores a portion of the prompt, such as system instructions or tool definitions, and serves it at a much lower rate after the initial write. For instance, one user saw an 85% reduction in their daily API bill by caching a large system prompt, effectively lowering the cost of repeated tokens from $3.00 to $0.30 per million. The effectiveness of prompt caching depends on the request frequency, with benefits diminishing if requests are spaced more than five minutes apart, as the cache TTL resets with each hit but expires after inactivity. AI

IMPACT Enables significant cost reductions for developers using large language models by optimizing token usage through prompt caching.

RANK_REASON The cluster describes a technical implementation detail and its cost-saving benefits for users of an existing AI model API, rather than a new model release or core research.

Read on dev.to — LLM tag →

AI-generated summary · Google Gemini · from 2 sources. How we write summaries →

Anthropic's Claude prompt caching slashes API costs by up to 85%

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The cluster describes a technical implementation detail and its cost-saving benefits for users of an existing AI model API, rather than a new model release or core research.
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2 independent sources
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product, infra
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78 days old
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COVERAGE [2]

  1. dev.to — LLM tag TIER_1 English(EN) · Penloom Studio ·

    Prompt caching cut my Claude API bill by 85%. Here's the exact setup.

    <p>Last month I ran a side-by-side test on an AI agent that processes about 4,000 requests a day. The agent has a long system prompt (roughly 2,800 tokens of rules, tool definitions, and examples) that gets sent with every single call. Before prompt caching: $47/day. After enabli…

  2. r/ClaudeAI TIER_2 English(EN) · /u/jomi-se ·

    How prompt caching works in Claude Code (and how to stop wasting tokens)

    <!-- SC_OFF --><div class="md"><p>**TL;DR:** Claude Code caches your prompts as you go. When continuing an existing conversation, the previous part of your prompt that is already cached is billed only at 10% of the full cost. By default, Claude Code in billed-per-token setups set…

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