模型介绍
> **FLUX 3 Image Klein Prompt Upsampler** is Black Forest Labs' 9B vision-language model, a full fine-tune of Qwen3.5-9B with the vision tower frozen, that expands a short image request into the detailed prompt FLUX 3 Image Klein works best with. The card says Klein is not meant to run without an upsampler in front of it, because short prompts sent as typed give generic output. One model covers three modes, selected by the system prompt: text-to-image, editing with up to 10 reference images, and layout with optional bounding boxes. Output prompts spell out medium and style, scene, lighting and camera, and each subject's colors, materials and position, with any text to render kept verbatim in quotes. For edits it looks at the references and writes the instruction around what is in them, covering what changes and what stays. Bounding boxes are kept exactly, in a box table after the prompt, and the prompt cites each box by id. Training had two stages: supervised training on pairs of short requests and expanded prompts, then preference tuning on pairs of the model's own prompts, rendered with FLUX 3 Image Klein at the same seed and ranked on the resulting image. The card gives no benchmark numbers. Its one example turns "A man walking with his dog, afternoon sun" into a 220-word prompt. It is loaded by default in the official inference code and has an `enable_prompt_upsampler` switch in ComfyUI. With Diffusers, you run the Transformers block yourself and pass the caption as `prompt`. The limitations section says output is English only, though the request can be in any language, the prompts are tuned only for FLUX 3 Image Klein, and references are downscaled (at most 1 MP for one), so small details can be described wrongly. The model does not refuse requests, and the inference code offers optional prompt and image safety checks (`--safety`). The weights, a 18.8 GB bfloat16 file, are released under Apache 2.0.
主要特点
特点摘要待依据来源补齐，不凭模型名称推断能力。
局限与注意事项
暂无足够来源支持具体缺点结论。请重点验证实际任务表现、时延、数据政策、许可与版本生命周期。
来源报价与费用分析
同一模型在不同渠道、地区和配置下可能采用不同价格。下表独立保留各渠道报价，不将渠道价格视为厂商官方统一价格。
| 来源 / 渠道 | 输入 | 输出 | 计费单位 | 采集时间 |
|---|---|---|---|---|
| 暂未取得可核验报价，请查阅来源渠道。 | ||||
按月估算基础 Token 费用
预估不包含缓存优惠、阶梯定价、多模态附加费用、网络检索、税费及推理额外输出。
公开评测与运行配置
暂无已采集的可核验公开评分。模型未上榜不代表能力较低。
查看完整已收录榜单 →常见问题
开放权重是否代表可以免费商用？
不一定。应核对具体版本许可证、商用门槛和使用政策。自部署还会产生算力和维护成本。
这些价格是实时结算价格吗？
不是实时结算价格，而是带采集时间的来源报价快照。请到对应渠道核对当前版本、区域、折扣和计费方式。
资料来源与可追溯记录
许可证：apache-2.0。模型介绍与第三方评测均以原来源的具体版本和方法为准。