arXiv — NLP / Computation & Language · · 3 min read

FBK's Long-form SpeechLLMs for IWSLT 2026 Instruction Following

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Computer Science > Computation and Language

arXiv:2606.26819 (cs)
[Submitted on 25 Jun 2026]

Title:FBK's Long-form SpeechLLMs for IWSLT 2026 Instruction Following

View a PDF of the paper titled FBK's Long-form SpeechLLMs for IWSLT 2026 Instruction Following, by Zhihang Xie and 4 other authors
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Abstract:This paper describes our submission to the IWSLT 2026 Instruction Following shared task. SpeechLLMs are developed for both short-form and long-form speech instruction following under constrained settings. For the short track, strong performance is achieved on MCIF, with a SIFS score of 2.0708. For the long track, three speech segmentation methods are explored, and the HIFS score is introduced to account for unstable long-form generation. Experimental results show that fixed 30-second segmentation provides the most robust long-form performance, achieving the highest HIFS score of 2.0663. Further analysis shows that hallucination mainly manifests as repetitive insertions in generated outputs, substantially affecting ASR and SSUM, while short-form capabilities are largely retained after long-form extension.
Subjects: Computation and Language (cs.CL)
Cite as: arXiv:2606.26819 [cs.CL]
  (or arXiv:2606.26819v1 [cs.CL] for this version)
  https://doi.org/10.48550/arXiv.2606.26819
arXiv-issued DOI via DataCite (pending registration)

Submission history

From: Zhihang Xie [view email]
[v1] Thu, 25 Jun 2026 10:01:45 UTC (380 KB)
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