# OpenRouter: migrating from Opus 5 means adaptive-only thinking, retired forced tool use, and 20% lower pricing

OpenRouter lists those three differences for developers moving off Opus 5, and its migration guide covers what changed and how to update prompts.

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Source: OpenRouter · Published 9/22/2026, 09:56:29

OpenRouter says migrations from Opus 5 use adaptive-only thinking, retire forced tool use, and come with pricing that is 20% lower.

What changed and how to update prompts is covered in the [Opus 5.5 migration guide](https://openrouter.ai/docs/cookbook/evaluate-and-optimize/model-migrations/opus-5-5).

Tags: OpenRouter, Opus 5, Pricing, Model migration, Tool use

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