Not Diamond

Not Diamond is a model-routing service. For each request in a coding-agent session, it predicts which model and reasoning effort to use, with the aim of keeping output quality close to frontier models at lower cost. It is not a gateway: recommendations are executed in the customer's existing gateway and agent harness.

Routing decisions draw on payload semantics, KV cache state, implicit feedback signals, session outcomes, sub-agent structure, compaction events and prior turns, evaluated against a chosen model pool and cost objective. The vendor says it uses reinforcement learning to improve from feedback and reports at least 20-40% cost savings; these are vendor claims. An optional privacy-preserving mode routes on derived metadata and locally computed features, so the vendor does not see payloads.

Access is via API. Pay-as-you-go pricing suits developers and small teams, and an Enterprise tier adds volume discounts, SAML SSO, organization analytics and admin controls. The vendor states SOC 2 and ISO 27001 compliance. The site currently focuses on long-horizon coding-agent workloads, and custom harness integrations require contacting the vendor.