Not Diamond Model Router

Not Diamond, Inc. develops a model router that predicts the best language model for each input to cut cost while keeping accuracy. Its terms give a San Francisco address and state that the site owner is based in the United States; the founding year is not stated.

The current product, Not Diamond Code, targets coding agents and integrates with existing harnesses and gateways. The site claims 5%+ accuracy gains and 50%+ cost savings, and lists SOC 2 and ISO 27001. Logos include Hugging Face, Dropbox, IBM and American Express, with testimonials from OpenRouter, Replicated and Rootly.

• Model routing: predicts the best model per input to balance cost and accuracy.
• Coding agents: Not Diamond Code targets agent-driven development.
• Gateway compatibility: works with the buyer existing harness and gateway.
• Savings estimator: models savings from engineer count, spend and growth.
• Secure API: API with custom SLAs and 24/7 support.
• Prompt optimization: prompt optimization went generally available in 2026-01.

A Vietnamese outsourcing company can cut coding-agent cost across hundreds of engineers. A bank engineering team can route simple tasks to cheaper models. A product company can add routing behind its existing LLM gateway.

Per-input model selection lowers spend on coding-agent workloads. Compatibility with existing gateways avoids a rip-and-replace. A cost-savings estimator helps size the benefit. SOC 2 and ISO 27001 listed on the site support security reviews.

Coding-agent usage is raising enterprise LLM bills, which drives demand for model routing and cost control. Routing is distinct from gateways and often deployed alongside them. Vietnamese software and outsourcing firms adopting AI coding tools can use routing to manage cost per engineer.

Legal entity Not Diamond, Inc., San Francisco address; terms governed by Delaware law. About page lists about 30 investors including Jeff Dean and Julien Chaumond. SOC 2 and ISO 27001 listed.