Methodology
The calculator compares steady-state token run rates and divides one-time migration cost by monthly savings when the new route is cheaper.
Infrastructure and Migration
AI Model Migration Calculator
Compare old and new model run-rate economics with engineering, evaluation, and re-indexing costs.
Interactive Tool
Build a Scenario
| Result | Value | How to read it |
|---|---|---|
| Old monthly run rate | $4,000.00 | Current input and output token spend. |
| New monthly run rate | $1,800.00 | Candidate route at the same token volume. |
| One-time migration cost | $26,000.00 | Labor plus re-indexing or data work. |
| Monthly savings | $2,200.00 | Positive means the new route is cheaper. |
| Payback period | 11.82 months | One-time cost divided by monthly savings. |
Hold quality, token usage, latency, reliability, and support constant only if evidence justifies that assumption.
Catalog model: Anthropic Claude Fable 5 →
Inputs
What the Calculation Needs
| Input | How it is used |
|---|---|
| Monthly token volume | Comparable input and output demand after migration. |
| Old and new rates | Per-million-token prices for both routes. |
| Engineering and evaluation | Hours and blended labor cost for the migration. |
| Re-indexing | Optional one-time data or embedding migration cost. |
How to Interpret the Result
A positive payback is necessary, not sufficient. Include quality regression, fallback, dual-running, observability, and contract risk in the decision.
Boundaries
What the Result Does Not Prove
- Token usage can change after a model switch.
- Prices may refer to different providers or tiers.
- No monetary value is assigned to quality, reliability, or latency changes.
Catalog values retain their source and freshness on the linked model, provider, benchmark, or comparison page. Editable scenario assumptions are not Model Markets measurements.
Continue the Analysis
Related Tools
| Tool | Next question |
|---|---|
| Price vs Performance | Screen for models that combine useful published performance with acceptable token economics. |
| Self-Host vs API | Find the utilization and volume conditions under which a self-hosted inference cluster can beat an API on direct compute cost. |
| Model Pricing History | Turn two price snapshots into a comparable workload impact instead of comparing headline rates in isolation. |
Questions
Model Migration FAQs
What does the AI Model Migration Calculator calculate?+
Calculate payback for switching a production workload instead of comparing token prices alone. It returns old and new monthly run rates, one-time migration cost, monthly savings, and payback period.
Does the AI Model Migration Calculator use current model data?+
Where the calculation needs model facts, it uses the current Model Markets catalog snapshot updated 2026-09-02. User-entered assumptions remain clearly editable, and unsupported values stay unknown rather than being inferred.
What should I verify before using the AI Model Migration Calculator result?+
Token usage can change after a model switch. Prices may refer to different providers or tiers. No monetary value is assigned to quality, reliability, or latency changes. Open the linked canonical records and primary sources before making a production or purchasing decision.