# Track Specification: Cost & Token Analytics Panel

## Overview
Real-time cost tracking panel for API usage by model and tier.

## Current State Audit
### Already Implemented
- cost_tracker.py with MODEL_PRICING
- estimate_cost() function
- Token tracking in ai_client.py

### Gaps to Fill
- No GUI panel for cost display
- No session totals

## Goals
- Cost per model display
- Session totals
- Breakdown by tier

## Functional Requirements
- Real-time cost updates
- Per-model breakdown
- Tier breakdown

## Non-Functional Requirements
- <10ms update latency
- Clear visual formatting