Compare the cost per accepted result, including failed attempts, review time and retries. Record model/version, input and output size, reasoning settings, response time and correctness. Repeat representative cases; one impressive answer or a vendor leaderboard does not establish reliability for your build.
For APIs, check input/output rates, caching, tool charges, limits and availability. For local use, include hardware, electricity, storage and maintenance. A mixture-of-experts model activates only some parameters per token, but that active count alone does not tell you how much memory its weights need. Test the intended context and concurrent workload.
Keep an exportable test set and saved outputs. Re-run it before switching model versions or providers, and choose a failure state when the service is unavailable.
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