Model Usage

Use CodexBar CLI local cost usage to summarize per-model usage for Codex or Claude, including

Model Usage is a community skill for tracking AI model usage and costs, covering token consumption analysis, per-model cost summaries, usage history tracking, spending reports, and budget monitoring for AI development workflows.

What Is This?

Overview

Model Usage provides visibility into AI model consumption and associated costs through local usage tracking. It covers token consumption analysis that counts input and output tokens used by each model call, per-model cost summaries that calculate spending broken down by model type and pricing tier, usage history tracking that records API calls with timestamps and context for audit trails, spending reports that aggregate costs over time periods with trend analysis, and budget monitoring that alerts when spending approaches configured limits. The skill helps teams understand and control AI infrastructure costs, providing granular visibility into spending patterns that cloud provider dashboards cannot match. It enables data-driven decisions about model selection and prompt optimization by showing which approaches consume the most tokens and generate the highest costs. For example, comparing GPT-4 versus GPT-3.5 usage across a sprint can reveal whether premium model selection is justified by output quality or whether a cheaper alternative would suffice.

Who Should Use This

This skill serves developers tracking AI API costs, teams managing AI budgets, and project managers monitoring model usage patterns across multiple workstreams or client engagements.

Why Use It?

Problems It Solves

AI model costs accumulate quickly across multiple projects and team members without centralized tracking. Understanding which features and workflows consume the most tokens requires manual log analysis. Cloud provider billing dashboards lack detail for attributing costs to specific models or projects. Detecting cost anomalies and unexpected usage spikes happens too late without real-time monitoring, leading to budget overruns that could have been prevented with earlier intervention. By the time monthly bills arrive, thousands of dollars may have been wasted on inefficient implementations or runaway automation processes that nobody noticed were consuming excessive API calls.

Core Highlights

Token counter tracks input and output token usage for every model call. Cost calculator summarizes spending by model type with pricing data. History recorder logs all API calls with timestamps and metadata. Budget monitor alerts when spending exceeds thresholds.

How to Use It?

Basic Usage

model-usage summary

model-usage costs \
  --by-model

model-usage history \
  --limit 20

model-usage export \
  --format csv

Real-World Examples

model-usage costs \
  --period month \
  --by-model \
  --format table

model-usage tokens \
  --model gpt-4 \
  --date-range \
    "2025-03-01:2025-03-31"

model-usage budget \
  --limit 1000.00 \
  --alert-threshold 0.8

model-usage export \
  --format json \
  > usage_data.json

Advanced Tips

Set up automated daily or weekly reports to track spending trends before they become budget issues, allowing proactive intervention rather than reactive cost cutting. Regular reporting helps teams correlate usage spikes with specific features or development activities for better cost attribution. Export usage data to spreadsheets or business intelligence tools for detailed analysis, enabling custom visualizations and longer-term trend comparisons across quarters. Configure budget alerts at multiple threshold levels, such as 50%, 80%, and 95% of your limit, to provide graduated early warnings for unexpected cost increases and give teams adequate time to respond before limits are reached.

When to Use It?

Use Cases

Monitor AI model costs across multiple projects to identify high-spending features and optimize usage. Generate monthly cost reports for finance teams with detailed breakdowns by model and project. Set budget alerts to prevent unexpected spending overruns during development and testing.

Related Topics

AI cost management, token tracking, budget monitoring, usage analytics, API metering, and cost optimization.

Important Notes

Requirements

Local database or storage for recording usage data and history. Integration with AI model API calls to capture token counts and metadata. Current model pricing information configured for accurate cost calculations.

Usage Recommendations

Do: review usage reports regularly to identify cost optimization opportunities. Set budget alerts at conservative thresholds to provide early warning signals. Export usage data periodically for backup and external analysis tools.

Don't: ignore usage spikes that may indicate inefficient prompt engineering or runaway automation. Rely solely on cloud provider billing since it lacks project-level detail. Set budget limits without monitoring actual usage patterns first.

Limitations

Cost calculations depend on accurate pricing data that may change with provider updates. Usage tracking only captures calls that pass through the instrumented code paths. Historical data accuracy depends on consistent logging across all model interactions.