Prompt caching

Prompt Caching

Caching strategies for LLM prompts including Anthropic prompt caching, response caching, and CAG (Cache Augmented Generation)

Capabilities

• prompt-cache
• response-cache
• kv-cache
• cag-patterns
• cache-invalidation

Prerequisites

• Knowledge: Caching fundamentals, LLM API usage, Hash functions
• Skills_recommended: context-window-management

Scope

• Does_not_cover: CDN caching, Database query caching, Static asset caching
• Boundaries: Focus is LLM-specific caching, Covers prompt and response caching

Ecosystem

Primary_tools

• Anthropic Prompt Caching - Native prompt caching in Claude API
• Redis - In-memory cache for responses
• OpenAI Caching - Automatic caching in OpenAI API

Patterns

Anthropic Prompt Caching

Use Claude's native prompt caching for repeated prefixes

When to use: Using Claude API with stable system prompts or context

import Anthropic from '@anthropic-ai/sdk';

const client = new Anthropic();

// Cache the stable parts of your prompt async function queryWithCaching(userQuery: string) { const response = await client.messages.create({ model: "claude-sonnet-4-20250514", max_tokens: 1024, system: [ { type: "text", text: LONG_SYSTEM_PROMPT, // Your detailed instructions cache_control: { type: "ephemeral" } // Cache this! }, { type: "text", text: KNOWLEDGE_BASE, // Large static context cache_control: { type: "ephemeral" } } ], messages: [ { role: "user", content: userQuery } // Dynamic part ] });

// Check cache usage
console.log(`Cache read: ${response.usage.cache_read_input_tokens}`);
console.log(`Cache write: ${response.usage.cache_creation_input_tokens}`);

return response;

}

// Cost savings: 90% reduction on cached tokens // Latency savings: Up to 2x faster

Response Caching

Cache full LLM responses for identical or similar queries

When to use: Same queries asked repeatedly

import { createHash } from 'crypto'; import Redis from 'ioredis';

const redis = new Redis(process.env.REDIS_URL);

class ResponseCache { private ttl = 3600; // 1 hour default

// Exact match caching
async getCached(prompt: string): Promise<string | null> {
    const key = this.hashPrompt(prompt);
    return await redis.get(`response:${key}`);
}

async setCached(prompt: string, response: string): Promise<void> {
    const key = this.hashPrompt(prompt);
    await redis.set(`response:${key}`, response, 'EX', this.ttl);
}

private hashPrompt(prompt: string): string {
    return createHash('sha256').update(prompt).digest('hex');
}

// Semantic similarity caching
async getSemanticallySimilar(
    prompt: string,
    threshold: number = 0.95
): Promise<string | null> {
    const embedding = await embed(prompt);
    const similar = await this.vectorCache.search(embedding, 1);

    if (similar.length && similar[0].similarity > threshold) {
        return await redis.get(`response:${similar[0].id}`);
    }
    return null;
}

// Temperature-aware caching
async getCachedWithParams(
    prompt: string,
    params: { temperature: number; model: string }
): Promise<string | null> {
    // Only cache low-temperature responses
    if (params.temperature > 0.5) return null;

    const key = this.hashPrompt(
        `${prompt}|${params.model}|${params.temperature}`
    );
    return await redis.get(`response:${key}`);
}

}

Cache Augmented Generation (CAG)

Pre-cache documents in prompt instead of RAG retrieval

When to use: Document corpus is stable and fits in context

// CAG: Pre-compute document context, cache in prompt // Better than RAG when: // - Documents are stable // - Total fits in context window // - Latency is critical

class CAGSystem { private cachedContext: string | null = null; private lastUpdate: number = 0;

async buildCachedContext(documents: Document[]): Promise<void> {
    // Pre-process and format documents
    const formatted = documents.map(d =>
        `## ${d.title}\n${d.content}`
    ).join('\n\n');

    // Store with timestamp
    this.cachedContext = formatted;
    this.lastUpdate = Date.now();
}

async query(userQuery: string): Promise<string> {
    // Use cached context directly in prompt
    const response = await client.messages.create({
        model: "claude-sonnet-4-20250514",
        max_tokens: 1024,
        system: [
            {
                type: "text",
                text: "You are a helpful assistant with access to the following documentation.",
                cache_control: { type: "ephemeral" }
            },
            {
                typ