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fix(billing): prevent channel_mapped override from reverting BillingModel when channel did not map

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When a channel has no model mapping for the requested model, ChannelMappedModel
equals OriginalModel (the user's arbitrary input). Combined with the default
BillingModelSource="channel_mapped", this incorrectly overrides the BillingModel
set by the OpenAI format conversion layer (e.g., gpt-5.4 from DefaultMappedModel)
back to the unmapped original model (e.g., glm) which has no pricing — resulting
in zero-cost billing.

Add guard condition so the channel_mapped override only fires when the channel
actually changed the model (ChannelMappedModel != OriginalModel).
This commit is contained in:
shaw
2026-04-05 17:31:18 +08:00
parent dbb248df52
commit f585a15eff
2 changed files with 84 additions and 1 deletions
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backend/internal/service/openai_gateway_service.go
+1 -1
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@@ -4277,7 +4277,7 @@ func (s *OpenAIGatewayService) RecordUsage(ctx context.Context, input *OpenAIRec
if result.BillingModel != "" {
billingModel = strings.TrimSpace(result.BillingModel)
}
if input.BillingModelSource == BillingModelSourceChannelMapped && input.ChannelMappedModel != "" {
if input.BillingModelSource == BillingModelSourceChannelMapped && input.ChannelMappedModel != "" && input.ChannelMappedModel != input.OriginalModel {
billingModel = input.ChannelMappedModel
}
if input.BillingModelSource == BillingModelSourceRequested && input.OriginalModel != "" {