Bug: Desktop app v1.15.4 — "Model big-pickle not supported for format anthropic"

[yhammad-dev]

Description

Using OpenCode Desktop on Windows. When using the free model opencode/big-pickle, I get the error "Model big-pickle not supported for format anthropic". The session was working before, then disconnected, and now this error appears on every attempt.

According to the OpenCode Zen docs, Big Pickle uses:

• Endpoint: https://opencode.ai/zen/v1/chat/completions
• SDK: @ai-sdk/openai-compatible

But the Desktop app is routing it through the Anthropic format (/v1/messages) instead of the OpenAI-compatible endpoint.

Steps to reproduce:

1. Open OpenCode Desktop v1.15.4
2. Select opencode/big-pickle as model
3. Try to send a message in an existing or new session
4. Error appears: "Model big-pickle not supported for format anthropic"

Other free models (deepseek-v4-flash-free, qwen3.6-plus-free) may work fine — only big-pickle is affected.

Plugins

No response

OpenCode version

Desktop v1.15.4

Steps to reproduce

No response

Screenshot and/or share link

No response

Operating System

No response

Terminal

No response

[github-actions]

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

• Big Pickle not working. #28138: Same error ("Model big-pickle not supported for format anthropic") after upgrading to v1.15.4 — identical symptom and version
• Big Pickle (big-pickle) model returns AI_APICallError - was working before #28141: Big Pickle returns AI_APICallError on v1.15.4 — same model stopped working on the same version

Please review those issues and consider adding any new information there rather than opening a new report.

[ronee23]

yep have tested....other models are working