AI-Driven Caching Strategies: Smart Redis Patterns (2026)
Category: Sustainability & Green AI
Introduction
The most sustainable query is the one you never make. Caching is the ultimate optimization. But traditional caching (LRU - Least Recently Used) is dumb. It doesn't know what users will ask next.
AI-Driven Caching changes the game. By understanding semantics and predicting user behavior, we can achieve cache hit rates that were previously impossible.
1. Semantic Caching (The LLM Saver)
As discussed in Article 12, LLM queries are expensive. You don't want to pay OpenAI twice for the same question.
How it works
- User A: "What is the capital of France?"
- System: Embeds query -> Vector
[0.1, 0.9, ...]. Checks Redis Vector DB. Miss. Calls LLM. Caches result.
- User B: "Tell me France's capital city."
- System: Embeds query. Finds it is 98% similar to User A's query. Returns cached result.
- RedisVL: A Redis library specifically for vector similarity search.
- GPTCache: An open-source library for semantic caching.
2. Predictive Prefetching
Traditional prefetching guesses sequential IDs (if user requested /product/1, fetch /product/2). AI is smarter.
Scenario: E-Commerce
- User: Views "iPhone 16 Pro Case."
- AI Model: Analyzes millions of sessions. "Users who view cases usually view Screen Protectors next."
- Action: System prefetches the "Screen Protector" JSON data into the Edge Cache before the user even clicks.
3. Dynamic TTL (Time-To-Live)
Static TTLs (e.g., "Cache for 1 hour") are inefficient.
- News Site: A breaking news story changes every minute. A 1-hour cache is too long.
- Archive: An article from 2020 never changes. A 1-hour cache is too short.
AI Approach:
- AI analyzes the volatility of the data source.
- Sets
TTL = 60s for the Breaking News endpoint.
- Sets
TTL = 30d for the Archive endpoint.
Implementation: Redis + AI
Redis is no longer just a key-value store. With Redis Stack, it includes:
- RediSearch: Full-text search.
- RedisJSON: Storing documents.
- RedisVector: Storing embeddings.
Code Snippet: Semantic Cache Lookup
import redis
from sentence_transformers import SentenceTransformer
r = redis.Redis()
model = SentenceTransformer('all-MiniLM-L6-v2')
def get_answer(question):
vector = model.encode(question).tobytes()
# Check Cache (KNN Search)
cached = r.ft("idx:llm_cache").search(
Query("*=>[KNN 1 @vector $vec AS score]").return_field("answer"),
{"vec": vector}
)
if cached.docs and cached.docs[0].score < 0.1:
return cached.docs[0].answer
# Cache Miss: Call LLM
answer = call_openai(question)
r.hset(f"q:{hash(question)}", mapping={"vector": vector, "answer": answer})
return answer
Conclusion
Smart caching reduces latency, saves money, and lowers energy consumption. By moving from "dumb" key-matching to "smart" semantic understanding, we make our applications feel instantaneous.
