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fix: correct cache cost for OpenRouter and other OpenAI-compatible providers - #4256
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fixes #534, #454, #2020
Problem: There's a significant mismatch in costs displayed in OpenCode vs OpenRouter.
OpenRouter provides
inputTokensas the total count of input tokens (including cached).AFAIK other providers (OpenRouter/OpenAI/Gemini etc.) do it the same way e.g. vercel/ai#8794 (comment)
Anthropic does it differently though -
inputTokensdoesn't include cached tokens.It looks like OpenCode's cost calculation assumes all providers return
inputTokensthe same way Anthropic does (I'm guessinggetUsagelogic was originally implemented with anthropic), so it's causing incorrect cost calculation for OpenRouter and others.Testing:
Verified against OpenRouter data - costs are now matching almost perfectly.
Why almost -
cache.writecosts are not included in OpenRouter's metadata, so there may be minor discrepancies for the messages with cache writes. This seems to be an upstream limitation that needs to be addressed by ai-sdk/openrouter.