How to Troubleshoot AWS Bedrock Token Discrepancies Between Billing and CloudWatch

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If you’re using the Bedrock Sonnet 4 model in the US East-1 region and have enabled CloudWatch logs, you might notice that the token or price metrics in your Logs Insights query are showing amounts that are three to four times less than your actual billing. This discrepancy can be confusing, so here’s a simple way to troubleshoot and get accurate cost insights.

First, check your Logs Insights query. Make sure all relevant metrics are included. The current query sums up input tokens, output tokens, cache read, and cache write tokens, and calculates their costs based on predefined rates. However, if you’re missing certain metrics, your total cost calculations might not reflect the actual charges.

One common issue is that some token types or costs might not be captured if your query doesn’t include all relevant metrics or if there are certain token categories not accounted for. Ensure you’re considering all token types, such as document, prompt, or other system tokens, if applicable.

Additionally, verify that the token count metrics you’re using are accurate and complete. Sometimes, logs might miss certain token counts, especially if logging isn’t enabled for all types of requests or operations. Consider enabling detailed logging or checking if there’s a need to include metrics like cache hits/misses or other tokens that contribute to billing.

Lastly, cross-reference your logs with your billing report to see if there are hidden charges or additional costs not reflected in your logged metrics. Sometimes, billing includes factors such as overage fees, surcharges, or other service fees that your logs might not track directly.

To improve accuracy, modify your query to include all relevant token counts and costs. Also, review your usage patterns to see if there’s any unexpected activity leading to higher charges. By aligning your logs with your billing details, you’ll get a clearer picture of your actual costs and avoid discrepancies.

Remember, keeping your logging detailed and regularly reviewing both logs and billing info helps prevent surprises and ensures you’re tracking your expenses correctly.