Institute of Foundation Models logo

K2 Horizon Uno

Institute of Foundation ModelsOpen WeightsPending Human Review

K2 Horizon Uno augments the Horizon autoregressive language backbone with a conditional LoRA diffusion pathway for parallel token proposals. The released 7B and 0.9B adapters require separately downloaded base model weights; the adapter repository is not a complete 7B language checkpoint. Uno’s sampler verifies proposed tokens against the frozen autoregressive pathway, preserving its output distribution under the method’s assumptions. This is a substantive decoding specialization rather than an independently enlarged language backbone. Apache-licensed adapters, code, training recipes, and a technical report support evaluation; throughput gains depend on workload and inference configuration.

2026-09-03
7B and 0.9B base tiers plus diffusion adapters
Autoregressive Transformer augmented with conditional LoRA discrete-diffusion pathway
Apache-2.0

Specifications

Parameters
7B and 0.9B base tiers plus diffusion adapters
Architecture
Autoregressive Transformer augmented with conditional LoRA discrete-diffusion pathway
License
Apache-2.0
Type
text
Modalities
text

Benchmark Scores

Advanced Specifications

Model Family
K2
Finetuned From
K2 Horizon
API Access
Not Available
Chat Interface
Not Available
Variants
K2-Horizon-7B-UnoK2-Horizon-0.9B-Uno

Capabilities & Limitations

Capabilities
parallel token generationspeculative verificationtext generationreasoningcoding
Known Limitations
Adapters require corresponding autoregressive base weightsLossless claims depend on the specified verification samplerSpeedup varies by batch size and hardware
Notable Use Cases
efficient self-hosted agentsdiffusion decoding researchthroughput-sensitive language serving

Related Models