Agency vs. in-house
AI Agent Agency vs. Hiring an In-House Developer
For one agent, a fixed-price build almost always costs less than a single month of a full-time AI engineer's salary — and ships faster. The calculus changes once you need several agents built and maintained continuously, which is where in-house starts to make sense.
The real cost comparison
A full-time AI/ML engineer's fully-loaded monthly cost (salary, benefits, employer taxes, recruiting) varies enormously by location and seniority — roughly $4,600–$16,700/month in Western Europe, and considerably higher in the US, where fully-loaded year-one costs commonly run $290,000–$480,000 for a mid-to-senior hire. A single fixed-price agent build from a studio like Tunovix runs $1,150–$12,050 one time. For one or two agents a year, that's not a close comparison on cost.
Where hiring in-house genuinely wins
Once the actual need is continuous — agents that need daily prompt iteration, new integrations added weekly, a team that needs its own AI capability rather than a delivered artifact — a full-time hire (or a small internal team) amortizes better than repeated agency engagements. The break-even is roughly 3-4 agent builds a year at typical agency pricing, though this varies with local salary costs and actual build complexity.
The hybrid that most teams actually end up using
A fixed-price build for the first agent (or first few), with source code fully delivered — see what "custom" actually includes — then an internal hire once the workload justifies it, working from a real, already-built codebase instead of starting from zero. This avoids the worst outcome of either path: an expensive hire sitting idle before there's real agent-building work, or years of one-off agency engagements that never build internal capability.
What doesn't change either way
Guardrails, evals, and an audit trail matter regardless of who builds it — an in-house hire without that discipline is exactly as risky as an agency without it. See what a properly-scoped build actually includes before comparing purely on cost.
Next step
Run the calculator for a real build-cost number, or get in touch to talk through whether your actual need is a build or ongoing capacity.
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