[BUG] Token burn is increasingly high since Opus 4.6

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Struggling to understand pricing, the /cost command doesnt help.

The pace of token burn is 2-3x of what I was paying with Opus 4.5 and 5x since Opus 4.1
Even plan prompts seems to burn $5 per prompt, while it was $2-3 in Opus 4.5.

What Should Happen?

Token burn should stay consistent between models

Steps to Reproduce

• Launch Claude Code in any medium-sized repo (claude).

• Run a planning prompt (e.g., “Plan how to refactor this repo to improve build times.”).

• After the response completes, run /cost.

• Repeat steps 2–3 with 2–3 similar planning prompts.

• Observe that /cost is unclear and per-prompt cost is ~$5, significantly higher than Opus 4.1/4.5.

Claude Model

Opus 4.6

Is this a regression?

idk

Claude Code Version

2.1.34

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

_No response_