Sathwik Tejaswi Madhusudhan
Machine learning engineer at ServiceNow; technical co-lead on the Apriel-1.5-15B-Thinker model
- Machine Learning Engineer (per Madhusudhan's GitHub profile, October 2026), ServiceNow78
Sathwik Tejaswi Madhusudhan is a machine learning engineer at ServiceNow, according to Madhusudhan's GitHub profile. Madhusudhan was technical co-lead for mid-training and post-training on ServiceNow's Apriel-1.5-15B-Thinker, a 15-billion-parameter open-weights multimodal reasoning model, and is the first named author of the December 2025 release post for Apriel-1.6-15B-Thinker, where Madhusudhan is listed under leads and management.7823
Apriel models
The Apriel-1.5-15B-Thinker paper (October 2025) lists Madhusudhan as technical co-lead for mid-training and post-training. The model starts from Pixtral-12B and applies a progressive three-stage training method.12
Madhusudhan is the first named author of the December 2025 post introducing Apriel-1.6-15B-Thinker, which builds on Apriel-1.5 with a focus on text and vision reasoning and lower reasoning-token use. Madhusudhan also appears among the authors of the April 2026 Super Apriel paper.34
The Apriel-H1 technical report (November 2025), on hybrid models that replace some attention layers of a 15B reasoning transformer with Mamba blocks through distillation, lists Madhusudhan as a technical co-lead under leads and management.56
Madhusudhan's GitHub profile gives the role of machine learning engineer at ServiceNow. That profile is linked from the Hugging Face account that Hugging Face lists as an author of the Apriel-1.5-15B-Thinker paper and as the first author of the Apriel-1.6-15B-Thinker release post.7893
Work
Apriel-1.6-15B-ThinkerOpen weights
First named author of the model's release post and listed under its leads and management.3
Apriel model familyOpen weights
Technical co-lead for mid-training and post-training on Apriel-1.5-15B-Thinker, as listed in the paper's contributions section.12
Career timeline
Oct 2025
Served as technical co-lead for mid-training and post-training on Apriel-1.5-15B-Thinker.12
Nov 2025
Listed as a technical co-lead of the Apriel-H1 technical report.56
Dec 9, 2025
Published the Apriel-1.6-15B-Thinker release post as first named author.3
Apr 2026
Co-authored the Super Apriel paper.4
Other documented roles
Roles the sources document but that are not confirmed as current.
- Technical co-lead for mid-training and post-training on Apriel-1.5-15B-Thinker; listed under leads and management for Apriel-1.6-15B-Thinker (2025), ServiceNow23
Related people
More sourced profiles at the same organization, in the same field, or from the same school.
- Shruthan RadhakrishnaAlso at ServiceNow
- Alec RadfordLanguage models
- Torsten ScholakAlso at ServiceNow
- Ali FarhadiMultimodal models
- Oleksiy OstapenkoAlso at ServiceNow
- Armen AghajanyanMultimodal models
- Paul SmithAlso at ServiceNow
- Dani YogatamaLanguage models
- Raymond LiAlso at ServiceNow
- Douwe KielaLanguage models
- Hassan ShapourianMultimodal models
- Hoifung PoonMultimodal models
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