Fine-tuning vs RAG vs prompting: when to use what（2026年ガイド）

本当に押さえるべきポイント： Fine-tuning vs RAG vs prompting: when to use what: fine-tuning.

なぜ重要か

• fine-tuning — production-grade understanding wins interviews and saves outages.
• Hiring managers in 2026 expect you to explain fine-tuning end to end.

コア概念

• Architecture: the moving parts behind fine-tuning.
• Control plane vs data plane: what fails and how it fails.
• Failure modes you will see in production.

設計とベストプラクティス

• Start with the official blueprint, then translate to your environment.
• Document trade-offs (HA, scale, cost, blast radius) in writing.
• Automate change with version control and CI checks.

よくある落とし穴

• Skipping baseline hardening because "the default is fine".
• Skipping observability — you cannot operate what you cannot see.
• Mixing dev and prod accounts/contexts in the same change window.

効率的に学ぶ

• Read the official docs end to end (1 pass).
• Build a lab and break it on purpose.
• Take a practice tournament that forces speed under pressure.

TechLeague tournamentで実戦練習: techleague.io.

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