[r/ML] [P] ColQwen3.5-v3 release + Case study

Summary

The ColQwen3.5-4.5B-v3 model has been released, achieving the #1 position on the MTEB ViDoRe leaderboard with a 75.67 mean score. This model demonstrates significant efficiency, using roughly half the parameters and memory footprint of the previous top model. While v3 offers only marginal improvements over v2, the v2 model itself made a substantial leap, outperforming 8B models.

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