Multi Model Cost Calculations are Bugged

[maharshi365]

Description

I think i found a bug with cost calculation. Occasionally i will use multiple models (generally claude to do an plan and initial implementation, and gemini to cleanup). I noticed today the cost calculation actually went down after i started using gemini. I think maybe its not taking into account what model each message was sent to ?

Plugins

No response

OpenCode version

1.1.6

Steps to reproduce

1. Do some work using a model (im using Claude Opus 4.5 from Amazon Bedrock)
2. Switch while in the session to a different model (im using Gemini 3 Pro Preview from Google)

See the costs not working right.

Screenshot and/or share link

https://opncd.ai/share/Un4b1u0T

Operating System

Windows 11

Terminal

Powershell 7

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• Cost in storage/session is always 0 #2891: Cost in storage/session is always 0
• bug: token cost seems inaccurate #2020: bug: token cost seems inaccurate
• Cost is dropping dramatically when opencode is finishing up. #485: Cost is dropping dramatically when opencode is finishing up
• Incorrect token usage #5440: Incorrect token usage

These issues all relate to cost calculation inaccuracies. Your case specifically mentions costs decreasing after switching models, which shares similarities with the cost tracking problems described in these issues.

Feel free to ignore if none of these address your specific case.

[maharshi365]

Got claude to do an analysis. It seems like a bug with TUI showing information for the last 100 messages, when the session is longer.
https://opncd.ai/share/zM46uSja