Koog 1.0 Is Out: Stable Core, Better Interop, and Multiplatform Observability

Alyona Chernyaeva

Last week at the KotlinConf 2026 keynote (watch the recording here), we announced Koog 1.0.

Koog is JetBrains’ open-source framework for building AI agents in Kotlin and Java. It provides the core building blocks for agentic applications: tools, workflows, persistence, memory, observability, and integrations with existing JVM and Kotlin Multiplatform projects.

We introduced Koog at KotlinConf last year. Since then, the framework has evolved through community feedback, internal use, and several public releases. Koog 1.0 is the next step: a more stable foundation for building reliable enterprise-ready agents.

What’s new in Koog 1.0

The biggest change in 1.0 is a strict commitment to stability. To give you a solid foundation for production, we guarantee no breaking changes for stable modules for at least one year.

This release also brings several major improvements across the framework:

• Local Android AI: New provider integrations, featuring support for running LiteRT models locally on Android devices.
• A redesigned Java interop layer with a cleaner and more consistent API.
• Decoupled HTTP transport, which makes it easier to integrate Koog into existing infrastructure and use different HTTP clients.
• OpenTelemetry support across Koog targets, including Kotlin Multiplatform environments.
• Improved persistence and memory support for long-running agents.
• Anthropic prompt caching support to help reduce latency and token costs for repeated prompts.

Koog 1.0 also includes many fixes, API cleanups, and migration improvements that prepare the framework for a more stable long-term evolution. For the full list of changes, see the Koog 1.0 release notes.

Try Koog 1.0

Koog 1.0 marks the framework’s move to a stable core API.

If you’re building agents that need tools, structured workflows, persistence, memory, observability, or integration with existing Kotlin and JVM applications, this release gives you a sturdier foundation to build on.

Explore the docs, update your dependencies, and start with the stable core modules. Add Beta modules only where you need functionality that is still evolving.

Thank you

We’d like to thank everyone who tried Koog, submitted issues, shared feedback, and contributed to the project over the past year. Koog 1.0 reflects a lot of that input, and we’re excited to keep building it with the community.