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Bug: incorrect max_tokens calculation when "thinking" is enabled & "budgetTokens" is set for Anthropic models #2055
Description
Issue when enabling "thinking" with Anthropic models (Opus in this case):
Tried setting budgetTokens in the opencode.json as follows:
{
"provider": {
"anthropic": {
"models": {
"claude-opus-4-1-20250805": {
"options": {
"thinking": {
"type": "enabled",
"budgetTokens": 16000
}
}
}
}
}
}
}causes this:
AI_APICallError: max_tokens: 48000 > 32000, which is the maximum allowed number of output tokens for claude-opus-4-1-20250805
I have tried to set "maxTokens|max_tokens" within the options, but there seems to (potentially) be a limitation with how the ai-sdk works: https://ai-sdk.dev/providers/ai-sdk-providers/anthropic
That said, it would probably be a good idea to subtract the budgetTokens from the max output tokens hard limit.
Reacted by Dale L. Jefferson
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github-actions commentedon Aug 19, 2025
This issue might be a duplicate of existing issues. Please check:
Feel free to ignore if none of these address your specific case.
snipeship commentedon Aug 19, 2025
It seems like setting:
works, but definitely feels like an unnecessary step.