New · Subagents

The best model is several models.

One workflow, multiple LLMs. Chain Cotera agents together and give each one its own model, tools, and scope. You get better accuracy and lower cost, without paying for a frontier model on every step.

Subagents walkthrough

Refund processing workflow

5 steps · 1,200 runs/day

Step 1Check pending refundGPT-5 mini
Step 2Verify order detailsHaiku 4.5
Step 3Check email logGPT-5 mini
Step 4Draft + send emailSonnet
Step 5Log in CRMHaiku 4.5

Accuracy

94%

+6 pts vs monolithic

Cost per run

$0.018

16× cheaper

Monthly spend

$648

save $9,792/mo

Why subagents

One model for everything is almost never right.

Specialized models, specialized jobs

Claude for nuanced research. Gemini's NanoBanana for creative briefs. Haiku for quick classification. Pick the right tool per step.

No more context drift

Each agent only sees what it needs. Smaller context windows mean fewer wrong tool calls and fewer hallucinated steps.

Cost that actually scales

Two cheap models can outperform one frontier model — at a fraction of the price. Scale to millions of runs without the spend spiral.

Scoped tools, safer agents

Each subagent only has the tools it needs. A refund agent can't accidentally trigger a marketing send. Permission boundaries, by design.

Test harness results

The cost-accuracy chart that changes the math.

Cost per task

USD
0.0000.0050.0100.0150.0200.025
GPT-5.5monolithic
Miniwithout sub-agents
Mini+ sub-agents

Accuracy

% correct
020406080100
GPT-5.5monolithic
Miniwithout sub-agents
Mini+ sub-agents

Mini with sub-agents matches GPT-5.5 accuracy — at 16× lower cost. Plain Mini gets you to $0.001 per task but drops to 88% accuracy. Adding sub-agents recovers the full 100% for the same $0.001 — versus $0.016 to get there with the frontier model.

WHAT ARE YOU WAITING FOR?

Ready to build?

Stop duct-taping tools.

Stop writing playbooks no one follows.

Start building agents that actually do the work—and do it well.

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Director, Customer Success