Breaking Changes in Sentence Transformers v6.0: transformers v5 Floor, API Shifts
tomaarsen · x · 2026-08-18
Key breaking changes in v6.0: transformers v5 & torch 2.2 are now the floor; similarity/similaritypairwise are methods, not properties; custom module classes need trustremotecode=True (local paths included); a bare list of chat messages is now one conversation, not a batch. The post also highlights that CrossEncoder.predict now upcasts logits to float32 before the activation, since sigmoid in bfloat16 saturates and randomizes top-candidate ordering — NanoBEIR nDCG@10 goes from 0.1849 to 0.6795.
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