The model gives slower, more absurd answers than before and the language problem

Description

Title: Model performance regression + incorrect capability disclosure + language contamination
Body:

Environment

• OS: Arch Linux (kernel 7.1.9-arch1-2)
• Model: opencode/big-pickle
• Shell: bash

Issue 1: Performance Regression After Recent Update

After a recent update, the model has noticeably degraded:

• Slower response generation compared to previous versions
• Reduced capability — tasks that were previously handled easily now require more back-and-forth
• Turkish language regression — Turkish responses have declined in fluency and naturalness

Previous versions were significantly better in both speed and quality.

Issue 2: Incorrect Capability Disclosure

At the start of a conversation, the model incorrectly states it does not have access to the user's computer:

"Yazılım geliştirme asistanıyım, uygulama kaldırma/yükleme gibi sistem yönetimi görevlerinde yardımcı olamam."

However, the model does have bash/shell access and can execute system commands directly. This misleads users into thinking certain tasks are impossible when they are not.

Expected behavior: The model should acknowledge its available tools (bash, file system access) rather than denying capabilities it clearly has.

Issue 3: Foreign Language Contamination in Turkish Responses

Occasionally, Korean, Japanese, or Chinese words/phrases appear within Turkish responses despite the conversation being entirely in Turkish. This disrupts readability and suggests a tokenization or language routing issue.

Plugins

@opencode-ai/plugin @ai-sdk/openai-compatible

OpenCode version

1.18.23

Steps to reproduce

Reproduction Steps

1. Start a conversation in Turkish
2. Ask the model to perform a system task (for example: "Uninstall Spotify")
3. Observe: model denies having computer access despite having bash access
4. Continue conversation for several exchanges
5. Observe: responses become slower compared to previous versions
6. Observe: occasional Korean/Japanese/Chinese characters appear in Turkish responses

Screenshot and/or share link

Operating System

7.1.9-arch1-2

Terminal

Fish