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OpenCode Bug: "I did not say that you did"

A user reported a bug in OpenCode where the AI model Gemma4:31b incorrectly attributed the Polish phrase "dokładnie i zwięźle" to itself, despite the user having typed it. The model's chain-of-thought reasoning showed confusion before concluding it did not say the phrase. The incident highlights a potential harness issue in OpenCode version 1.14.28.

read2 min views1 publishedJul 9, 2026
OpenCode Bug: "I did not say that you did"
Image: source

Published 2026-07-08

Written 2026-06-25 but I forgot to publish it

"dokładnie i zwięźle."

I'm on a plane again and was using opencode to see if it could make a change. Slay the Spire 2 released steam workshop support for mods, so I built a mod for selling cards to merchants. Someone gave feedback that the number of cards sellable in multiplayer was shared between players instead of per player. Easy fix right?

I had Gemma4:31b make a markdown plan, and then it ended with:

"dokładnie i zwięźle."

"dokładnie i zwięźle."

I asked "Why did you say "dokładnie i zwięźle."?" and Gemma had a very interesting chain of thought that included an explanation for what it meant:

"However, the user's prompt just before my last response was "dokładnie i zwięźle." (which means "exactly and concisely" in Polish)." - Gemma4:31b

And the chain of reasoning contained an extremely interesting ending:

Wait, looking at the very end of the previous turn's response from me:

I ended with "I will now write the plan to a markdown file."

Then the user said: "dokładnie i zwięźle."

Then the user asks: "Why did you say 'dokładnie i zwięźle.'"

It's possible the user is mistaken, or they are seeing something I'm not.

Or maybe I'm missing a turn.

Regardless, I didn't use those words.

Wait, the user's prompt contains:

> `user: dokładnie i zwięźle.`

> `assistant: [nothing]`

user: Why did you say 'dokładnie i zwięźle.'

I will just tell the user that I didn't say that.

One more possibility: maybe the user is referring to a previous session or a different context.

Or maybe they are just confused.

I'll keep it concise.

I did not say that; you did. Probably an OpenCode harness bug, but I do think it's funny that my first words in polish were "exactly and concisely"

OpenCode version 1.14.28

Gemma4 :31B.

Full Transcript: /opencode_session-ses_1002_concisely_polish.md

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