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19 Sep 2024Alibaba (Qwen)Qwen2.5 (0.5B-72B) with Qwen2.5-Coder and Qwen2.5-Math Qwen2.5 family pretrained on up to 18T tokens, sizes 0.5B to 72B, 128K context; 72B reported ahead of Llama-3.1-70B and Mistral-Large-V2.19 Sep 2024AnthropicContextual Retrieval Contextual Retrieval prepends chunk-specific context before embedding, cutting failed retrievals 35% (embeddings), 49% (with BM25) and 67% (with reranking).