Halyard
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Release note · 14 November 2026

Halyard 3 reasons in long arcs, not short hops.

A 1.2M-token context, verified tool use and a planning head trained on 41 billion steps of agentic traces. Available today in the API and on-prem.A 1.2M-token context, verified tool use and a planning head trained on 41 billion steps of agentic traces. Available today in the API and on-prem.

Long-horizon eval

+38.4%+38.4%

Task completion on HorizonBench-500 over Halyard 2, with no change to latency at p50.

From the paper

Plans should bend, not break.

Dr. Ines Achterberg, Head of Reasoning

halyard-3 · playground
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Plan a 3-week migration of our billing service to event sourcing, with a rollback at every step.Plan a 3-week migration of our billing service to event sourcing, with a rollback at every step.

Research agenda

Interpretability you can audit. Evaluations you can rerun. Weights you can host.