We’ve been using gpt-4.1 nano for weeks with no such noticeable issue but today we have seen three instances of such token repetition. It feels like a regression occurred even if, AFAIK, there is only one checkpoint: 2025-04-14.
Examples:
[...] explicitly mentioning it in multiple sections (e.g., paras 4, 76, 86, 102, 106, 122, 132, 142, 182, 202, 217, 222, 227, 231, 237, 242, 247, 251, 256, 261, 266, 271, 276, 281, 286, 291, 296, 301, 306, 311, 316, 321, 326, 331, 336, 341, 346, 351, 356, 361, 366, 371, 376, 381, 386, 391, 396, 401, 406, 411, 416, 421, 426, 431, 436, 441, [and an and on]
[...] nor does it explicitly address constitutional issues related to racial profiling or systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic systemic [and an and on]
[...] (see paragraphs <para>112, 113, 115, 120, 122, 129, 132, 139, 142, 145, 150, 154, 159, 170, 173, 176, 179, 182, 185, 188, 191, 194, 197, 200, 203, 210, 213, 217, 220, 223, 226, 229, 232, 235, 238, 241, 244, 247, 250, 253, 256, 259, 262, 265, 268, 271, 274, 277, 280, 283, 286, 289, 292, 295, 298, 301, 304, 307, 310, 313, 316, 319, 322, 325, 328, 331, 334, 337, 340, 343, 346, 349, 352, 355, 358, 361, 364, 367, 370, 373, 376, 379, 382, 385, 388, 391, 394, [and an and on]