bugfix

internal/chat/pricing.go

@@ -2,14 +2,22 @@ package chat
 
 import "strconv"
 
-// computeCost returns the cost in USD for a single LLM call.
-// Prices on LLMModel are expressed in USD per million tokens.
-func computeCost(m LLMModel, ptok, ctok, ttok int) float64 {
+// ComputeCost returns the cost in USD for a single LLM call.
+// Prices on LLMModel are expressed in USD per million tokens. Exported so other
+// modules (e.g. internal/acp session cost accounting) reuse the single pricing
+// formula instead of replicating it.
+func ComputeCost(m LLMModel, ptok, ctok, ttok int) float64 {
 	return (float64(ptok)*m.PromptPricePerMillionUSD +
 		float64(ctok)*m.CompletionPricePerMillionUSD +
 		float64(ttok)*m.ThinkingPricePerMillionUSD) / 1_000_000
 }
 
+// computeCost is a thin alias kept for the existing internal caller (streamer.go)
+// so that change stays untouched while ComputeCost is the public entry point.
+func computeCost(m LLMModel, ptok, ctok, ttok int) float64 {
+	return ComputeCost(m, ptok, ctok, ttok)
+}
+
 // int64ToString converts an int64 to its decimal string representation.
 // Uses strconv.FormatInt rather than fmt.Sprintf for efficiency.
 func int64ToString(v int64) string { return strconv.FormatInt(v, 10) }