CRITICAL: Fix cost calculation formula causing near-zero costs

[spenceriam]

🚨 Critical Fix: Cost Calculation Issue

Problem

The cost calculation formula was using division by 1000 instead of direct multiplication, causing:

• ❌ Near-zero cost values in UI
• ❌ Inaccurate billing tracking
• ❌ Vercel deployment compilation issues

Root Cause

// ❌ Wrong formula (was dividing by 1000)
const promptCost = (usage.prompt_tokens / 1000) * parseFloat(selectedModel.pricing.prompt)

// ✅ Correct formula (direct multiplication)
const promptCost = usage.prompt_tokens * promptPrice

Solution

Fixed cost calculation in all three functions:

• ✅ generateCurrentPhase: Fixed /1000 division → direct multiplication
• ✅ generateWithData: Fixed /1000 division → direct multiplication
• ✅ approveAndProceed: Fixed /1000 division → direct multiplication

Impact

• ✅ Build Success: Vercel deployments will now compile properly
• ✅ Accurate Costs: Cost calculations match OpenRouter billing exactly
• ✅ Better UX: Users see real cost tracking instead of $0.0001 values
• ✅ Debug Logging: Added clear cost logging for debugging

Testing

• ✅ Local build passes: npm run build successful
• ✅ All cost calculation paths fixed
• ✅ Maintains existing functionality

Priority: Critical - Fixes deployment blocking issue and core cost tracking functionality.

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
open-spec	Ready	Preview	Comment	Sep 21, 2025 9:29pm