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Not Diamond Code launched on 2026-08-04 as a cache-aware model router for…

2026-08-04 · 17:10 UTC ·@dr_cintas ·1 min read

Brief

Not Diamond Code is a cache-aware model router for long-horizon coding agents that plugs into running sessions to pick the model and reasoning effort per step. It monitors session outcomes and compaction events, uses online RL to improve routing across 60+ models from multiple providers, and claims 20–40% (announcement) to 20–65% (Tomas Kofman) inference-cost reductions while remaining compatible with gateways like Claude Code.

Why it matters

Not Diamond Code launched on 2026-08-04 as a cache-aware model router for long-running coding agents that plugs into agent sessions and automatically selects the best model and reasoning effort for each step.

Key details

  • The router reads session outcomes and compaction events, improves recommendations in real time via reinforcement learning, and can route across 60+ models from multiple providers.
  • Claims: marketed as 'Frontier quality' with 20–40% lower inference cost in the announcement; Tomas Hernando Kofman separately claims 20–65% cost reduction without impacting quality; it works with any gateway/harness, including Claude Code.
Source evidence

🚨 Not Diamond Code just launched, a cache-aware model router built for coding agents.

plugs into your long-running agent sessions, learns which model fits each step, then routes every call automatically.

  • picks the model and reasoning effort at each step
  • reads session outcomes and compaction events to decide
  • improves its recommendations in real time via RL
  • routes across 60+ models from multiple providers

Frontier quality. 20–40% lower inference cost

Video

Tomas Hernando Kofman (@tomas_hk)

Today we’re announcing Not Diamond Code, the world’s most powerful intelligent model router for long-horizon coding agents.

Not Diamond works with any gateway or harness, including Claude Code, to select the best model and reasoning effort for each step, reducing costs by 20-65% without impacting quality.

Video

— https://nitter.net/tomas_hk/status/2084669945150062619#m