Engineering
What 4.1 billion routed requests taught us about model choice
Across a quarter of production traffic, 71% of prompts cleared the quality bar on a model costing a twentieth of the one they were sent to.
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Engineering
Release
Zentic 2.1: twelve providers, faster failover, cheaper cache
Failover now completes in under 40 ms, the cache understands near-duplicate prompts, and two new regional endpoints are live.
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Cost
The autocomplete problem: why your cheapest feature costs the most
Autocomplete fires on every keystroke. Sent to a reasoning model, it will quietly outspend everything else you have built.
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Reliability
Designing failover that users never notice
Retrying is easy. Retrying without changing the response shape, doubling the bill or breaking streaming is the hard part.
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Evals
Grading live traffic without storing it
How we sample, score and discard real requests inside a retention window measured in hours.
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Security
Regional pinning, explained for the legal review
What actually crosses a border when a prompt is routed, and what the audit log records about it.
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