{"schema_version":"onlylabs.public_signal.v1","title":"StepFun Model: stepfun-ai/NextStep-1.1-Pretrain","description":"StepFun model signal with public source context, captured evidence pages, related signals, and category-scoped analysis context.","url":"https://onlylabs.fyi/signals/f6b2bd36-f3d7-4bc2-bb3f-77d53e812199","json_url":"https://onlylabs.fyi/signals/f6b2bd36-f3d7-4bc2-bb3f-77d53e812199/signal.json","generated_at":"2026-06-11T02:49:47.590602+00:00","org":{"slug":"stepfun","name":"StepFun","category":"neolab","category_label":"Neolab","dossier_url":"https://onlylabs.fyi/labs/stepfun","dossier_json_url":"https://onlylabs.fyi/labs/stepfun/dossier.json"},"related_urls":{"signal":"https://onlylabs.fyi/signals/f6b2bd36-f3d7-4bc2-bb3f-77d53e812199","signal_json":"https://onlylabs.fyi/signals/f6b2bd36-f3d7-4bc2-bb3f-77d53e812199/signal.json","source":"https://huggingface.co/stepfun-ai/NextStep-1.1-Pretrain","lab_dossier":"https://onlylabs.fyi/labs/stepfun","lab_dossier_json":"https://onlylabs.fyi/labs/stepfun/dossier.json","analysis":"https://onlylabs.fyi/analysis/stepfun","analysis_json":"https://onlylabs.fyi/analysis/stepfun/analysis.json","analysis_evidence_json":"https://onlylabs.fyi/analysis/stepfun/evidence.json","category":"https://onlylabs.fyi/neolabs","category_json":"https://onlylabs.fyi/neolabs.json","category_feed":"https://onlylabs.fyi/neolabs/feed.xml","category_signals_json":"https://onlylabs.fyi/signals.json?category=neolab","topic":"https://onlylabs.fyi/topics/releases","topic_signals_json":"https://onlylabs.fyi/topics/releases/signals.json?category=neolab","topic_feed":"https://onlylabs.fyi/topics/releases/feed.xml?category=neolab","data_business":null},"answer_pack":{"answer":"StepFun published stepfun-ai/NextStep-1.1-Pretrain. 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This version effectively resolves the visualization failures seen in **NextStep-1** and substantially elevates image quality through extended training and a Flow-based Reinforcement Learning (RL) post-training paradigm. <div align='center'> <img src=\"assets/comparision.png\" class=\"interpolation-image\" alt=\"arch.\" width=\"100%\" /> </div> What's New in 1.1? NextStep-1.1 is not just a fine-tune; it is a re-engineered version focused on stability and high-fidelity output. Key improvements include: - RL Enhanced Visual Fidelity: Significant improvement in image texture and a substantial reduction in visual artifacts via RL, ensuring much cleaner and more professional outputs. - Technical Stability: Solves numerical instability inherent in the RL of autoregressive flow-based models. Environment Setup To avoid potential..."},"evidence_pages":[{"url":"https://huggingface.co/stepfun-ai/NextStep-1.1-Pretrain/raw/main/README.md","final_url":"https://huggingface.co/stepfun-ai/NextStep-1.1-Pretrain/raw/main/README.md","title":"stepfun-ai/NextStep-1.1-Pretrain model card","http_status":200,"content_type":"text/plain; charset=utf-8","capture_method":"plain","fetched_at":"2026-06-11T02:49:47.590602+00:00","bytes":4038,"raw_path":"f13b95bc24d61f7fc71d9c2c7f1c1143ee36b1e174a50602ab4f75bf288447be.md","content_hash":"3ad6a13c27a764f783f63060590eba63b62d6d764128852c8532ec165b2d20cd","excerpt_chars":1200,"truncated":true,"excerpt":"--- license: apache-2.0 pipeline_tag: text-to-image library_name: transformers --- NextStep-1.1 [Homepage](https://stepfun.ai/research/en/nextstep-1)&nbsp; | [GitHub](https://github.com/stepfun-ai/NextStep-1)&nbsp; | [Paper](https://arxiv.org/abs/2508.10711)&nbsp; We introduce **NextStep-1.1**, a new model represents a significant leap forward in the NextStep series. This version effectively resolves the visualization failures seen in **NextStep-1** and substantially elevates image quality through extended training and a Flow-based Reinforcement Learning (RL) post-training paradigm. <div align='center'> <img src=\"assets/comparision.png\" class=\"interpolation-image\" alt=\"arch.\" width=\"100%\" /> </div> What's New in 1.1? NextStep-1.1 is not just a fine-tune; it is a re-engineered version focused on stability and high-fidelity output. Key improvements include: - RL Enhanced Visual Fidelity: Significant improvement in image texture and a substantial reduction in visual artifacts via RL, ensuring much cleaner and more professional outputs. - Technical Stability: Solves numerical instability inherent in the RL of autoregressive flow-based models. 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