---
title: "AI and coding agents: the best model is never the one you think — Marsanne Studio AI watch"
description: "Multi-model orchestration for AI coding would cut costs by a factor of 2.5 while meeting governance requirements."
url: "https://marsanne.studio/en/ai-watch/ai-and-coding-agents-the-best-model-is-never-the-one-you-b0430c/"
lang: "en"
---

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Opinion · 21 September 2026

# AI and coding agents: the best model is never the one you think

Original title, in French: “IA et Coding Agent : le meilleur modèle n'est jamais celui que vous croyez”

**Publication**

Journal du Net (France)

**Author**

[Laurent Gil](https://www.journaldunet.com/account/laurent-gil-240872)

**Published on**

21 September 2026 · read in the page structured data

## Summary

The article argues that companies should stop systematically using a frontier AI model for all coding tasks and move to multi-model orchestration, which routes each subtask to the most suitable model. According to internal evaluations carried out by Cast AI under production conditions, this approach can be 2.5 times cheaper than one relying exclusively on commercial models, with no loss in code quality. The author also highlights data governance and sovereignty issues (GDPR, processing location) that only an orchestration layer would make it possible to manage, as the adoption of coding agents grows within engineering teams.

Summary based on the full text of the article.

[Read the article on Journal du Net →](https://www.journaldunet.com/intelligence-artificielle/1555007-ia-et-coding-agent-le-meilleur-modele-n-est-jamais-celui-que-vous-croyez/)

## Classification

**Country**

Worldwide scope

**Company size**

All sizes

**Industries**

Software vendors, IT services companies, telecoms

**Companies**

Cast AI (study author)

**Keywords**

coding agent, multi-model orchestration, AI costs, data governance, software development, open-source models

Entry written by Marsanne Studio from the cited article, with the help of an AI model (claude-sonnet-5). The rights to the article and its illustrations belong to Journal du Net and its author. Entry translated from French by Claude Sonnet 5.5.