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AI21 Labs has introduced Jamba Reasoning 3B, a compact, open-source reasoning model designed for on-device intelligence. Built on a novel SSM-Transformer architecture, the 3B parameter model offers significant efficiency gains, a 256K token context window, and a small memory footprint. It outperforms competing models from DeepSeek, Google, and Microsoft on key benchmarks, particularly in instruction-following and general knowledge. Released under the Apache 2.0 license, Jamba Reasoning 3B enables secure, local processing for enterprise applications and personal assistants, reducing reliance on costly cloud-based LLMs.