Horizons – OSS agent execution engine
I'm Josh, founder of Synth. We've been working on coding agent optimization with method like GEPA and MIPRO (the latter of which, I helped to originally develop), agent evaluation via methods like RLMs, and large scale deployment for training and inference. We've also worked on patterns for memory, processing live context, and managing agent actions, combining it all in a single stack called Horizons. With the release of OpenAI's Frontier and the consumer excitement around OpenClaw, we think the timing is right to release a v0. It integrates with our sdk for evaluation and optimization but…
Horizons – OSS agent execution engine launched on February 6, 2026 with 39 votes, #617 of 16,628 launches that month and more than 95% of that year's launches. The site was not reachable when checked in September 2026.
In plain words
Horizons is an open-source engine for executing coding agents at scale. Built by the team at Synth, it handles agent optimization, evaluation, and deployment through a unified stack that manages memory, live context, and agent actions. The platform supports multiple code execution models and integrates with Synth's evaluation and optimization SDK while offering self-hosted options. It's designed for developers building agent-based products who want to focus on proprietary data and algorithms rather than infrastructure.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
I'm Josh, founder of Synth. We've been working on coding agent optimization with method like GEPA and MIPRO (the latter of which, I helped to originally develop), agent evaluation via methods like RLMs, and large scale deployment for training and inference. We've also worked on patterns for memory, processing live…
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