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Bad request ... input should be image/jpeg ... #23990
Description
Description
Bad Request: messages.2.content.0.tool_result.content.1.image.source.base64.media_type: Input should be 'image/jpeg', 'image/png', 'image/gif' or 'image/webp'
Plugins
No response
OpenCode version
1.14.21
1.14.22
Steps to reproduce
- Ask to update something in the spec of a custom image format
- the spec file is read
- message
Bad Request: messages.2.content.0.tool_result.content.1.image.source.base64.media_type: Input should be 'image/jpeg', 'image/png', 'image/gif' or 'image/webp'appears using Claude Sonnet 4.6 (but similar error messages also come with Gemini/ChatGPT, while Big Pickle seems to work)
I've updated to the latest version and I've added explicitly to agents.md not to send, retrieve ety. any images
Screenshot and/or share link
Error Slaude Sonnet 4.6:
Error ChatGPT:
Operating System
Win11 25H2
Terminal
Windows Terminal
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github-actions commentedon Apr 23, 2026
This issue might be a duplicate of existing issues. Please check:
Input should be 'image/jpeg', 'image/png', 'image/gif' or 'image/webp') when OpenCode reads an unsupported image format (AVIF/custom format) and forwards it to the API — the root cause and symptoms appear identical.Please review those issues and, if they cover your case, consider adding a comment there instead.
FlominatorTM commentedon Apr 23, 2026
Maybe also related to #23983
FlominatorTM commentedon Apr 24, 2026
Problem persists with 1.14.22. Explicitly telling OpenCode to avoid the spec file works (except when wanting it to be updated)
github-actions commentedon Jul 3, 2026
To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.