How Much Does the Gemini API Cost?
Gemini pricing spans a wide range — from a generous free tier to premium models. The range is exactly where agent bills get decided.
How Gemini pricing works
Per-token pricing per model generation, with a free tier for light usage.
Frontier models (e.g. the latest Gemini tiers) cost more per token than compact ones.
Context caching discounts repeated prompts.
The hidden cost: model drift and loops
Agents can silently migrate to pricier model generations as defaults change.
Retry loops and fan-out multiply volume on whatever model is selected.
Long-context agent runs (tool outputs, documents) are the expensive shape.
What it really costs
Model generation × volume × context. Pin the model, cap the volume, and the bill stays predictable.
Where the money goes
| Lever | What it controls | Tool |
|---|---|---|
| Model generation | Per-token rate | Pin model choices |
| Retry loops | Multiplied volume | Velocity limits |
| Context length | Tokens per call | Context caps, trimming |
| Merchant scope | Which vendors | Merchant allowlist |
FAQ
Does Gemini have a free tier?
Yes — a limited free tier exists for light usage. Production agent workloads will exceed it.
Why did my Gemini bill jump?
Model generation changes, retry loops, and longer contexts are the usual causes. Velocity limits and caps address all three.
Can sipi.bot govern Gemini spend?
Yes — per-agent ceilings, category rules, and velocity limits apply to any API merchant your agents call.
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