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Curtail

ReGrade™

Powered by patented NCAST technology

Packet-level analysis that catches regressions in API behavior by comparing real traffic across software versions.

How Curtail’s ReGrade can help you

Supercharge your AI coding agent

We gave Claude Code the same codebase, the same two known bugs, and the same AI model. One session used ReGrade’s structured delta tools. The other used raw traffic replay. Here’s what happened.

Ghost CMS v2.2.2 → v2.2.3 · Claude Opus 4.6 · 72 Requests · 3,328 Deltas

3.2×

Faster

3m 41s vs 11m 56s

44%

Less Costly

$2.02 vs $3.57

71%

Fewer Tokens

1.2M vs 4.1M tokens

96%

Root-Cause Quality

of deltas traced to root cause

Without ReGradeWith ReGrade

Wall-Clock Time

Without ReGrade11m 56s
With ReGrade3m 41s−69%

Estimated Cost

Without ReGrade$3.57
With ReGrade$2.02−44%

Total Tokens

Without ReGrade4.1M
With ReGrade1.2M−71%

API Calls

Without ReGrade79
With ReGrade31−61%

Tool Calls

Without ReGrade48
With ReGrade16−67%

User Turns

Without ReGrade5
With ReGrade4−20%

With ReGrade’s structured delta tools, Claude traced 96% of flagged deltas to a single root cause — using 71% fewer tokens and finishing 3.2× faster than raw replay.

Ghost CMS API benchmark — 72 requests, 3,328 deltas, 2 known bugs. Advantages compound with larger datasets.

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