Optimize with Prompt Caching

Aider supports prompt caching for cost savings and faster responses:

Enable Caching:

aider --cache-prompts

Currently supported by:

• Anthropic (Claude Sonnet and Haiku)
• DeepSeek Chat

What Gets Cached:

• System prompt
• Read-only files
• Repository map
• Editable files

Prevent Cache Expiration:

aider --cache-keepalive-pings 5

This keeps the cache warm by pinging every 5 minutes (up to 5 times).

When enabled, you'll see "prompt cache" noted in the model announcement line at startup.