Elon Musk 确认 Grok 4.5 将于明天向公众发布。该模型基于 xAI 的 V9 基础模型，拥有 1.5T 参数，约为当前生产版本 v8-small 的 3 倍。V9 预训练于 2026 年 5 月 26 日完成，之后通过 Cursor 编程数据补充训练，强化学习仍在继续。xAI 计划 2026 年底前每月发布从头训练的新模型。Elon 称 Grok 4.5 为 Opus 级别模型，但速度更快、token 效率更高、成本更低。当前公开 API 模型仍为 Grok 4.3（Amazon Bedrock）。
wow. Elon Musk just cofirmed Grok 4.5 launching tomorrow.
Some details that we know so far about Grok 4.5 from various reports.
- Grok 4.5 is built on xAI’s V9 foundation model with 1.5T parameters.
- That makes it about 3x larger than v8-small, which currently serves production traffic on X.
- V9 pre-training was completed on May 26, 2026.
- Cursor coding data was added after pre-training through supplemental training.
- Reinforcement learning is still ongoing.
- xAI is planning monthly new-model releases trained from scratch through the end of 2026.
- Grok 4.3 remains the current public API model on Amazon Bedrock.
Based on strong positive feedback from customers in our beta test program, @SpaceXAI will make Grok 4.5 available to the public tomorrow. It is an Opus-class model, but faster, more token-efficient and lower cost.在 X 查看被引用的帖子
来源：Rohan Paul · x.com