Choosing Between Frontier LLMs: When Latency and Cost Beat Raw Benchmarks

Define the SLA first

Before comparing models, document the latency budget, acceptable error rate, and escalation path when the model refuses or hallucinates. Production systems punish average-case demos.

Capability vs. control

Larger models often follow nuanced instructions but cost more per request. Smaller models paired with retrieval can outperform giant vanilla prompts for grounded answers in narrow domains.

Red-team your own content

Test with the rudest customer questions, edge-case SKUs, and stale knowledge. If marketing claims appear in generated answers, verify against approved sources. Connect this practice to how we evaluate writing assistants for a consistent vendor lens.

Rollout pattern

Shadow mode first: log model outputs without showing users. Compare to human baselines, then canary to a small segment with clear rollback.