Esan runs on three model tiers. You don’t have to choose — Esan picks the right one for each task, using the light model for routine steps and reaching for a stronger one when the work needs it. You can always push a task to a more capable model.
Fast and light
The quick one. Instant answers, short drafts, simple lookups and the routine steps inside a bigger task. Low cost, so it does the everyday work without you thinking about it.
Best for
The everyday workhorse
Strong reasoning for real work — research, coding, analysis, planning. The default for most tasks: capable enough to be trusted, efficient enough to run all day.
Best for
The most capable
Reserved for the hardest, longest, highest-stakes work — deep reasoning, long autonomous runs, and the moments where getting it exactly right matters more than speed.
Best for
Which tiers you can reach depends on your plan. See plans →