Qwen 3.8 27B 现已在 Cerebras 上线,速度为每秒 1500 token。
Qwen 3.8 27B available on Cerebras at 1500 tokens/s

原始链接: https://inference-docs.cerebras.ai/models/overview

Cerebras 通过其公共 API 提供一系列开源模型,用户可通过免费试用或按需付费层级进行访问。对于高吞吐量、生产级别的需求,用户可选择专用端点(Dedicated Endpoints)。 关于模型完整性与压缩,Cerebras 始终保持完全透明: * **无剪枝(No Pruning):** 所有公共 API 模型均为未经剪枝的原始版本。任何未来对剪枝技术的探索都将托管在独立且标注清晰的端点上,以确保用户知情。 * **存储优化:** 虽然权重通过选择性量化(例如 4 位到 16 位)来节省空间,但公司采用实时反量化技术,确保运算以高精度执行。激活值、注意力机制及 KV 缓存保持完全的非量化精度,以维持最高质量。 * **研究访问:** 内部研究(如 REAP)产生的剪枝模型仅发布在 Hugging Face 上供实验使用,不通过生产 API 提供。 用户可查阅模型选择指南,为特定使用场景寻找合适方案,或按照快速入门指南开始进行 API 调用。

Cerebras 发布了 Qwen 2.5 7B 模型,其推理速度达到了惊人的每秒 1,500 个 token。Hacker News 上围绕此次发布的讨论,既展现了对该平台的兴奋,也提出了实际的顾虑: * **性能与容量:** 虽然用户对极高的速度感到震惊,但也有人指出 128k 的上下文窗口限制了该模型在长文本智能体任务中的效用。 * **平台顾虑:** 用户正在积极讨论该模型在 OpenRouter 上的可用性、目前账户注册和服务器可靠性方面存在的问题,以及对 Cerebras 依赖 Discord 提供客户支持的不满。 * **技术推测:** 参与者讨论了 Cerebras 晶圆级架构的硬件局限性,特别是为何他们专注于较小的模型而非超大规模参数模型,共识倾向于 SRAM 的制约以及经济可行性。 * **用例:** 开发人员对这种高速推理在提升 SaaS 应用用户体验方面的潜力持乐观态度,尽管一些人对当前的定价模式和是否支持提示词缓存(prompt caching)表示不确定。 总体而言,社区认为 Cerebras 的产品展示了其独特硬件的高性能,尽管其生态系统仍处于早期阶段。
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原文
Models on Cerebras public endpoints are available on the free trial and pay-as-you-go tiers, subject to rate limits and pricing. For additional model families, reserved capacity, higher throughput, and production SLAs, see Dedicated Endpoints.
New here? Follow the Quickstart to make your first API call. To pick a model by use case, see the model selection guide. Select any model name below for full specs, capabilities, and per-tier limits.

Available Models

Looking for more models? Many additional model families are available through Dedicated Endpoints.

Model Compression

This section provides transparency about the compression state of each model available on our platform. We host a variety of open-source models from the community. We do not currently host pruned models on our public endpoints. All models served through our public endpoints are the original, unpruned versions. While we conduct research on pruning techniques like REAP (Router-weighted Expert Activation Pruning), these pruned models are shared with the research community on Hugging Face but are not available through our shared API. You can read more about REAP in our research blog. All of our public models are unpruned. Cerebras uses selective weight-only quantization only during storage to preserve maximal quality. This means that the weights are stored in partial 16-bit / 8-bit / 4-bit, in-line with industry standards. For quality, sensitive layers are stored at full precision with dequantization on the fly, so operations are done in high precision. The activations, attention, and kv cache remain in full precision and unquantized.

Frequently Asked Questions

No. We are committed to serving the original models for all existing endpoints, without modification. We do not alter model architectures via pruning on our hosted portfolio. If we explore additional compression techniques (like pruning) in the future, these would be offered as separate endpoints with pruning-specific names, ensuring complete transparency and allowing you to choose which version best fits your needs.

Our REAP pruned models are available on Hugging Face for research and experimentation purposes: Cerebras REAP Collection. These models demonstrate our pruning research but are not served through our production API.
Compression is an umbrella term for techniques that reduce model size or computational requirements. Common compression techniques include:
  • Quantization: Reducing the precision of numbers used to represent model weights (e.g., converting from FP16 to FP8). This reduces memory usage without changing the model’s architecture.
  • Pruning: Permanently removing parts of a model, like layers or experts, to reduce model size. This changes the model’s architecture and creates a different model.
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