Terse, a Y Combinator-backed startup, released Durable Actors in late October 2026, a public-code primitive (a basic building block developers assemble into larger systems) for coordinating multiple AI agents. The company's YC launch post calls it "the perfect primitive for multiplayer AI and agent coordination."
We did not find a funding amount, customer names or usage figures in the materials reviewed for this story.
Co-founder Thomas Elias Karatzas announced the launch on October 29, according to a mirror of his post. The code sits in a public GitHub repository, TerseAI/durable-actors, which was live as of November 8, 2026. The materials reviewed did not explicitly confirm the repository's license. Terse also publishes a TypeScript SDK reference and concept documentation at docs.useterse.ai. YC's directory lists Olivier Simard-Morissette as a second founder alongside Karatzas; team size was not stated in the sources reviewed.
Why the timing matters
Agent builders increasingly need state that survives crashes and can be shared among agents. Terse is entering a field where larger, better-funded players are already shipping products.
The competition
Cloudflare documents Durable Objects, its stateful serverless offering. Rivet sells an actor product and, according to its changelog, made its Rust SDK for Rivet Actors generally available on November 6.
Restate published a Series A announcement dated September 30. Temporal has raised the most: a release announces a $550 million round at a $12.55 billion valuation, following an earlier release about a $300 million raise in February 2026.
None of this is conceptually new. The actor model, which lets independent units of code hold their own state and pass messages to one another, predates the current agent boom by years. Microsoft Research described Orleans, a virtual-actor system, in a March 2014 paper.
Signs of demand
Gartner said in an August 2025 press release that 40% of enterprise applications will feature task-specific AI agents by 2026, up from less than 5% in 2025. Menlo Ventures' 2026 State of Enterprise AI report, released November 3, carries the headline that enterprise AI spending rose 5.4x in one year "as agents take over."
Large vendors are also building durability into their own platforms. AWS announced Lambda durable telemetry on October 28.
What to watch
Terse has a pricing page alongside its documentation, but the research did not include details on whether a hosted offering will accompany the code. We did not find benchmarks published by the company against Cloudflare, Rivet or Restate in the sources reviewed. Rivet maintains its own benchmark methodology page, so a head-to-head comparison could follow.
Investors searching databases should note one possible source of confusion. A separate product at terseai.org, an on-device token optimizer and agent monitor, is unrelated to the YC company at useterse.ai, and revenue listings tied to that domain do not belong to Terse.
For now, the company's pitch rests on its launch post and its repository. Developers can read the code, and the market will test it against far better-capitalized rivals.
