A/B Testing Token Usage Calculator Examples
Explore practical token usage and API cost scenarios for control and variant groups in an A/B test.
These scenarios show how user volume, request frequency, and tokens per request affect total test usage and the variant's incremental cost. All figures are estimates based on a blended per-million-token price.
Balanced prompt experiment
A product team tests a richer prompt experience with equal traffic allocation.
Input Summary
Control users
5,000
Variant users
5,000
Requests per user
3
Control and variant tokens per request
1,200 and 1,500
Blended cost
$5.00 per million tokens
Calculation Breakdown
- 1Control usage5,000 × 3 × 1,20018,000,000 tokens
- 2Variant usage5,000 × 3 × 1,50022,500,000 tokens
- 3Incremental usage22,500,000 - (5,000 × 3 × 1,200)4,500,000 tokens
- 4Incremental cost4,500,000 / 1,000,000 × 5$22.50
Result Summary
Incremental cost
$22.50
A/B Testing Token Usage Calculator
The full test uses 40,500,000 tokens and costs an estimated $202.50. The variant adds $22.50 relative to a control-only baseline.
Uneven rollout with a lower-token variant
A team exposes 20% of users to a streamlined experience.
Input Summary
Control users
8,000
Variant users
2,000
Requests per user
4
Control and variant tokens per request
2,000 and 1,600
Blended cost
$8.00 per million tokens
Calculation Breakdown
- 1Control usage8,000 × 4 × 2,00064,000,000 tokens
- 2Variant usage2,000 × 4 × 1,60012,800,000 tokens
- 3Incremental usage76,800,000 - (40,000 × 2,000)-3,200,000 tokens
- 4Incremental cost-3,200,000 / 1,000,000 × 8-$25.60
Result Summary
Incremental cost
-$25.60
A/B Testing Token Usage Calculator
The test uses 76,800,000 tokens, costing an estimated $614.40. The variant reduces estimated cost by $25.60 at the observed variant traffic.
High-volume model comparison
A team evaluates a variant at substantial traffic before a broader rollout.
Input Summary
Control users
50,000
Variant users
50,000
Requests per user
6
Control and variant tokens per request
900 and 1,100
Blended cost
$4.00 per million tokens
Calculation Breakdown
- 1Total requests(50,000 + 50,000) × 6600,000 requests
- 2Control usage50,000 × 6 × 900270,000,000 tokens
- 3Variant usage50,000 × 6 × 1,100330,000,000 tokens
- 4Variant impact60,000,000 / 1,000,000 × 4$240.00 additional
Result Summary
Total requests
600,000 requests
A/B Testing Token Usage Calculator
The experiment consumes an estimated 600,000,000 tokens at a cost of $2,400.00. The variant adds 60,000,000 tokens, or $240.00, versus control for all traffic.
How to Read Your Results
Total test token usage combines token consumption from both the control and variant groups.
Estimated test cost applies your entered blended price to all calculated test tokens.
Incremental variant tokens compare actual usage with a hypothetical test in which every request used the control token rate.
A positive incremental cost means the variant costs more in token usage; a negative value means it uses fewer tokens.
Use measured averages where possible and refresh inputs as test traffic or prompt behavior changes.
Assumptions & Important Notes
- Each example treats input and output token use as one average total per request.
- The stated token price is a blended estimate in the example currency.
- User counts and requests per user reflect the complete test period.
- Non-token charges are not included unless covered by the blended rate.
Related Examples
Frequently Asked Questions
What is a good sample for token usage estimates?
Use a sample that reflects the prompts, user segments, models, and response lengths expected during the test.
Why can total test cost rise even when the variant group is smaller?
The variant may make more requests per user or use substantially more tokens per request than control.
Can a variant reduce token cost?
Yes. If it uses fewer average tokens per request than control, its incremental token usage and cost will be negative.
Should I use planned or observed users?
Use planned values for a forecast and observed values for a post-test estimate. Keep the interpretation clear.
Ready to calculate your own result?
Use the live calculator with your own inputs, timing, and preferences.