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IBM[1] Research's blog post is dated 29 April 2026 and says 'today IBM released the Granite 4.1 collection'; the ibm-granite/granite-4.1-8b model card gives 'Release Date: April 29th, 2026'. GIGAZINE's Japan-time report is dated 30 April.IBM releases Granite 4.1, dense 3B, 8B and 30B language models under Apache 2.0 whose 8B instruct matches or beats the 32B-parameter Granite 4.0 mixture-of-experts model, alongside new vision, speech, guardian and embedding models.