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Costly – Open-source SDK that audits your LLM API costs

Costly – Open-source SDK that audits your LLM API costs

by itsdannyt·Mar 14, 2026·4 points·1 comment

AI Analysis

●●SolidSolve My ProblemSlick

Seven automated detectors flag wasted tokens and suggest specific fixes like prompt caching.

Strengths
  • Detectors flag anti-patterns like repeated system prompts instead of raw usage logs.
  • One-command install instruments code without manual wrapper changes or extra configuration.
  • Audit advice suggests concrete fixes like enabling prompt caching to cut costs.
Weaknesses
  • Competes with Helicone and LangSmith, which already track API costs thoroughly.
  • Dashboard requires waiting 48 hours for data, delaying immediate value verification.
Target Audience

AI engineers and CTOs managing high LLM API bills

Similar To

Helicone · LangSmith · Portkey

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