# Anthropic outlines steps to prepare for AI-driven code modernization

Digest AI · Enterprise & Industry · published 2026-09-23T00:00:00Z

Canonical: https://digestai.news/story/anthropic-outlines-steps-to-prepare-for-ai-driven-code-modernization

## Summary

Anthropic’s engineering team shares a practical guide for enterprises planning AI‑driven code modernization. The article breaks the effort into six steps, starting with defining the target end state—whether a transform modernization that swaps the stack while keeping behavior, or a reimagine modernization that also adds new functionality. It stresses early consensus on the modernization type, detailed inventory of current behavior, and using Claude to map dependencies and extract business rules.

The guide then describes how to build a "certificate" of evidence that each change must satisfy, involving developers, user groups, and business leads in its design. A tiered promotion policy is recommended to balance speed and review depth, with lighter human review for high‑risk, time‑critical updates. Claude Code and the code‑modernization plugin are suggested for automating discovery, rule extraction, and token‑usage measurement, while models like Sonnet can handle high‑volume mechanical checks and more capable models can address complex transformations. The article also advises measuring token costs on a pilot, extrapolating to estimate a cost floor, and optimizing the workflow to reduce expensive retries.

## Key points

- Anthropic recommends six‑step process, starting with defining target modernization type (transform or reimagine)
- Claude can map dependencies, extract rules, and help build a certificate of evidence for each change
- Measure token usage on a pilot to estimate cost floor and optimize model selection (Sonnet for volume, larger models for hard tasks)

## Why it matters

Enterprises can shorten multi‑year legacy‑system upgrades to months by using agentic coding tools, but must redesign governance to maintain compliance and risk control.

## Sources

1. [How to prepare for AI-driven code modernization projects](https://claude.com/blog/how-to-prepare-for-ai-driven-code-modernization-projects) (Anthropic Engineering, 2026-09-23, primary source)

Part of the developing story: [Claude Code Quality and Billing Controversy](https://digestai.news/thread/anthropic-sets-higher-quality-standards-for-claude-generated-production-code) (5 stories)

## Cite

Digest AI, "Anthropic outlines steps to prepare for AI-driven code modernization", 23 September 2026, https://digestai.news/story/anthropic-outlines-steps-to-prepare-for-ai-driven-code-modernization

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