How much does a research agent cost per month?

On Claude Sonnet, about $3,598 a month at 600 requests a day with the assumptions below. The cheapest model compared here, Gemini 1.5 Flash, runs about $126 for the same workload. Your real figure moves with volume and tokens, so tune it in the calculator.

Which model is cheapest for a research agent?

Gemini 1.5 Flash, at about $126 a month for this workload. Cheaper is not automatically better: a model that needs retries or longer prompts can cost more in practice, so test the candidates on your own evaluation set before committing.

What does a research agent cost to run?

An agent that searches the web, reads results, and synthesizes an answer over many tool calls. Low volume but long, tool-heavy runs, so the agentic context tax is the headline cost. On Claude Sonnet this works out to about $3,598 a month; here is the figure across every model and what drives it.

assumptions

A planning estimate for this shape of workload. Tune any of it in the calculator.

600 research runs a day
~1,500 prompt tokens per request
~800 output tokens per turn
6 tool calls per run (search, fetch, read, repeat)
A flat serving line for a warm endpoint

monthly_cost · Claude Sonnet

$3,598/ month

Input tokens37.8k/req · agentic context: $2,041
Output tokens5.6k/req: $1,512
GCP servingwarm endpoint, flat: $45.00

37.8k input · 5.6k output · 7 LLM turns / request

cost_by_model

A research agent across every model

Monthly cost of a Research agent across models
model	cost / month
Gemini 1.5 FlashGoogle (Vertex)	$126cheapest
GPT-4o miniOpenAI	$208
Claude HaikuAnthropic	$993
Gemini 1.5 ProGoogle (Vertex)	$1,400
GPT-4oOpenAI	$2,754
Claude SonnetAnthropic · shown above	$3,598
Claude OpusAnthropic	$17,811

cheapest · public list prices as of 2026-06 · planning estimate, not a quote

free_toolTune this scenario to your numbersOpens the AI Agent Cost Calculator prefilled with this workload. Change the volume, tokens, tool calls, and RAG to match your own and watch the cost move.

what_drives_it

Where the money goes

Six tool calls per run re-send a growing context each turn, so input tokens climb steeply. The loop length, not the volume, sets the bill.

The cheapest option here, Gemini 1.5 Flash, comes to about $126 a month against $3,598 on Claude Sonnet. Whether the cheaper model fits is a question for your evaluation set, not the price sheet. The bigger lever is usually the workload itself: caching re-sent context, trimming what each turn carries, and capping the tool loop move the bill more than swapping models does.

other_workloads

faq

Questions & answers

How much does a research agent cost per month?: On Claude Sonnet, about $3,598 a month at 600 requests a day with the assumptions below. The cheapest model compared here, Gemini 1.5 Flash, runs about $126 for the same workload. Your real figure moves with volume and tokens, so tune it in the calculator.
What makes a research agent expensive?: Six tool calls per run re-send a growing context each turn, so input tokens climb steeply. The loop length, not the volume, sets the bill.
Which model is cheapest for a research agent?: Gemini 1.5 Flash, at about $126 a month for this workload. Cheaper is not automatically better: a model that needs retries or longer prompts can cost more in practice, so test the candidates on your own evaluation set before committing.

A cost estimate is a start. Making an agent cheap in production is the work.

Prompt caching, context trimming, and the right model per step usually cut an agent's bill by more than half. Book a call, or leave your email and I'll reach out.

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