Oleksiy Ostapenko
Core contributor to Super Apriel, ServiceNow Research's 15B supernet with switchable attention mixers
Oleksiy Ostapenko is one of three core contributors to Super Apriel, a 15-billion-parameter supernet from ServiceNow Research in which every decoder layer offers several trained mixer choices, released as SuperApriel-15B-Base and SuperApriel-15B-Instruct. The paper's contributions section credits Ostapenko with model development, supernet training, serving infrastructure and throughput benchmarking. Ostapenko is also first author of the Apriel-H1 technical report (November 2025) on hybrid attention and Mamba models.123
Apriel-H1
Ostapenko is first author of the Apriel-H1 technical report (November 2025) from ServiceNow, which lists Ostapenko among its core contributors. The report introduces hybrid 15B reasoning models obtained by incremental distillation from Apriel-Nemotron-15B-Thinker, replacing less critical attention layers with Mamba blocks. Ostapenko also co-wrote ServiceNow-AI's November 2025 post describing the approach.345
Super Apriel
The Super Apriel paper (April 2026) lists Ostapenko first among three core contributors, alongside Raymond Li and Torsten Scholak, with authors sorted alphabetically. The model is a 15B-parameter supernet whose decoder layers each provide four trained mixer choices, so that one checkpoint can be served at several speeds.12
According to the paper's author contributions, Ostapenko worked on model development and experiment planning, optimized the vLLM supernet serving infrastructure, ran supernet training through distillation and supervised fine-tuning, contributed to mixer initialization and placement evaluation code, and benchmarked inference throughput.2
Work
SuperApriel-15B-InstructOpen weights
Core contributor to Super Apriel who ran supernet training (distillation and supervised fine-tuning), optimized the vLLM serving infrastructure and benchmarked inference throughput.2
Career timeline
Other documented roles
Roles the sources document but that are not confirmed as current.
- ServiceNow (author affiliation on the November 2025 Apriel-H1 and April 2026 Super Apriel papers), ServiceNow24
Related people
More sourced profiles at the same organization, in the same field, or from the same school.
- Paul SmithAlso at ServiceNow
- Arjun DesaiLanguage models
- Raymond LiAlso at ServiceNow
- Azalia MirhoseiniLanguage models
- Sathwik Tejaswi MadhusudhanAlso at ServiceNow
- BartowskiInference and serving
- Shruthan RadhakrishnaAlso at ServiceNow
- Eric HartfordLanguage models
- Torsten ScholakAlso at ServiceNow
- Furu WeiLanguage models
- Krithik PuthalathLanguage models
- Song HanInference and serving
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