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Read tool for kimi k2.5 on zen dose not work on images #8187

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opened 2026-02-16 18:09:23 -05:00 by yindo · 1 comment
yindo commented 2026-02-16 18:09:23 -05:00
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Originally created by @SirStisx on GitHub (Jan 31, 2026).

Originally assigned to: @fwang on GitHub.

Description

when kimi k2.5 use read tool on a image it says somthing like this,

"I can't tell what the image shows from just the base64 data - I don't have vision capabilities to decode and view it"

pasting a image in the message works,

swaping moddel in same conversation and telling to do the same works.

Plugins

No response

OpenCode version

v1.1.48

Steps to reproduce

  1. have a jpg in a folder
  2. tell kimi k2.5 to use read tool on the image

Screenshot and/or share link

No response

Operating System

mac os

Terminal

ghosty

Originally created by @SirStisx on GitHub (Jan 31, 2026). Originally assigned to: @fwang on GitHub. ### Description when kimi k2.5 use read tool on a image it says somthing like this, "I can't tell what the image shows from just the base64 data - I don't have vision capabilities to decode and view it" pasting a image in the message works, swaping moddel in same conversation and telling to do the same works. ### Plugins _No response_ ### OpenCode version v1.1.48 ### Steps to reproduce 1. have a jpg in a folder 2. tell kimi k2.5 to use read tool on the image ### Screenshot and/or share link _No response_ ### Operating System mac os ### Terminal ghosty
yindo added the bugzen labels 2026-02-16 18:09:23 -05:00
yindo closed this issue 2026-02-16 18:09:23 -05:00
yindo commented 2026-02-16 18:09:23 -05:00
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@github-actions[bot] commented on GitHub (Jan 31, 2026):

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

  • #11304: Images returned from Read tool don't work with OpenAI-compatible providers (Kimi K2.5 specifically mentioned)
  • #11306: Read tool fails to read image files even with vision-capable models (paste works)
  • #11437: Read tool accesses JPEG file but vision model receives base64 string instead

These issues describe the exact same symptom - the Read tool returns base64-encoded images instead of letting vision-capable models handle them natively. This is particularly affecting OpenAI-compatible providers like Kimi K2.5 when accessed through Zen.

Feel free to ignore if your case is different, but these related issues may provide additional context or workarounds.

@github-actions[bot] commented on GitHub (Jan 31, 2026): This issue might be a duplicate of existing issues. Please check: - #11304: Images returned from Read tool don't work with OpenAI-compatible providers (Kimi K2.5 specifically mentioned) - #11306: Read tool fails to read image files even with vision-capable models (paste works) - #11437: Read tool accesses JPEG file but vision model receives base64 string instead These issues describe the exact same symptom - the Read tool returns base64-encoded images instead of letting vision-capable models handle them natively. This is particularly affecting OpenAI-compatible providers like Kimi K2.5 when accessed through Zen. Feel free to ignore if your case is different, but these related issues may provide additional context or workarounds.
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Reference: anomalyco/opencode#8187
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