Anthropic enhanced its API Prompt Caching with automated TTL sliding renewal. For sustained agent interactions, active context caches are automatically extended without re-write penalties, reducing overall token write costs by 40% in multi-turn software workflows while maintaining sub-300ms TTFT.

Key Takeaways

  • ✓Active context caches automatically slide TTL window, avoiding recurring cache write surcharges.
  • ✓Reduces multi-turn developer session token expenses by an average of 40%.
  • ✓Maintains sub-300ms time-to-first-token (TTFT) during dense MCP tool calls.
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Key Decision Metrics at a Glance

TL;DR Verdict
🏆 Benchmark RankRank
Reduces multi-turn developer session token expenses by an average of 40%.
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💰 Cost & PlansCompare
Claude 3.7 Sonnet (Hybrid Reasoning) · in: $3 / out: $15
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🛠️ Ecosystem & IDERules
Anthropic · Prompt caching · Claude 3 7
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Up NextClaude Code waits 3x less for the first token: gzip on every turn and cloud sessions that warm up as you type (p90 4.07s to 1.33s)
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