Claude API Cost Optimization

Save 50-90% on Claude API costs with three officially verified techniques

Quick Reference

Technique Savings Use When

Batch API 50% Tasks can wait up to 24h

Prompt Caching 90% Repeated system prompts (>1K tokens)

Extended Thinking ~80% Complex reasoning tasks

Batch + Cache ~95% Bulk tasks with shared context

1. Batch API (50% Off)

When to Use

• Bulk translations

• Daily content generation

• Overnight report processing

• NOT for real-time chat

Code Example

import anthropic

client = anthropic.Anthropic()

batch = client.messages.batches.create( requests=[ { "custom_id": "task-001", "params": { "model": "claude-sonnet-4-5", "max_tokens": 1024, "messages": [{"role": "user", "content": "Task 1"}] } } ] )

Results available within 24h (usually <1h)

for result in client.messages.batches.results(batch.id): print(f"{result.custom_id}: {result.result.message.content[0].text}")

Key Finding: Bigger Batches = Faster!

Batch Size Time/Request

Large (294) 0.45 min

Small (10) 9.84 min

22x efficiency difference! Always batch 100+ requests together.

2. Prompt Caching (90% Off)

When to Use

• Long system prompts (>1K tokens)

• Repeated instructions

• RAG with large context

Code Example

response = client.messages.create( model="claude-sonnet-4-5", max_tokens=1024, system=[{ "type": "text", "text": "Your long system prompt here...", "cache_control": {"type": "ephemeral"} # Enable caching! }], messages=[{"role": "user", "content": "User question"}] )

First call: +25% (cache write)

Subsequent: -90% (cache read!)

Cache Rules

• Minimum: 1,024 tokens (Sonnet)

• TTL: 5 minutes (refreshes on use)

3. Extended Thinking (~80% Off)

When to Use

• Complex code architecture

• Strategic planning

• Mathematical reasoning

Code Example

response = client.messages.create( model="claude-sonnet-4-5", max_tokens=16000, thinking={ "type": "enabled", "budget_tokens": 10000 }, messages=[{"role": "user", "content": "Design architecture for..."}] )

Decision Flowchart

Can wait 24h? → Yes → Batch API (50% off) ↓ No Repeated prompts >1K? → Yes → Prompt Caching (90% off) ↓ No Complex reasoning? → Yes → Extended Thinking ↓ No Use normal API

Official Docs

• Batch Processing

• Prompt Caching

• Extended Thinking

Made with 🐾 by Washin Village - Verified against official Anthropic documentation