# Anthropic 推出 Sonnet 5，性能接近 Opus 4.8 但定价更低

- 来源：Chubby♨️ (@kimmonismus)
- 发布时间：2026-07-01 02:41
- AIHOT 分数：46
- AIHOT 链接：https://aihot.virxact.com/items/cmr104kn300dysldxev2ndyr8
- 原文链接：https://x.com/kimmonismus/status/2072027861385466123

## AI 摘要

Anthropic 发布 Sonnet 5，称其为迄今最具智能体能力的 Sonnet，推理、工具使用、编程和知识工作均有提升，性能接近 Opus 4.8 但更便宜。即日起至8月31日，输入 $2/M token、输出 $10/M token；标准定价 $3/M、$15/M。相比 Sonnet 4.6 更安全，幻觉和讨好度更低；网络安全防护默认开启，但 Opus 仍更强。独立评测者指出 Sonnet 5 整体弱于 Opus 4.8，认为版本号“5”名不副实，定价与前代一致令人失望。发布被视为顶级大模型延期监管下的权宜之举，未见 Opus 5 或 Fable 5 同步更新。

## 正文

Here is my first assessment of Sonnet 5：

Sonnet 5 is better than Sonnet 4.6. Who would have thought？ But jokes aside： Unfortunately， it is weaker than Opus 4.8 across all evals. Why they nevertheless labeled the latest Sonnet 5 iteration with a "5"， even though "4.8" would have been more fitting， is beyond me. Normally， major version jumps in particular signal a significant leap in capability. Be that as it may： Sonnet 5 is good， but worse than expected.

Pricing has not changed； it is on the same level as its predecessor. Opus is still more expensive， but at the same time it also remains better. Overall， the release irritates me and leaves more questions than it answers.

I cannot help but see Sonnet 5 as a release that stands in the context of Fable 5. There was no mention of Fable 5 at all， which surprises me a lot. I really would have expected us to get news about it at the same time. But nothing. Instead， we get an update to a new model series （"5"）， but one that is not significant compared with the models we already have.
As a result， there is a lingering aftertaste that Sonnet was released as something in between， perhaps also simply to release something at all and to stay part of the conversation， including in a positive sense. Why no Opus 5， when we know that Fable 5 already exists as a model that performs significantly better than 4.8， and when we can assume both that a better Opus exists internally and that it would not be difficult to update Opus to the new generation？ Why "only" Sonnet 5？

Because restraint is currently required. The major releases are currently being delayed across the board； they are still in discussions with regulators about how the truly powerful frontier releases can be carried out at all and under what conditions. In my view， the Sonnet 5 release has to be seen against this background. And as a result， at least for me， it was disappointing overall.

### 引用推文

> Chubby♨️：Here we go: Sonnet 5 is live: The tl;dr • Anthropic calls it the most agentic Sonnet yet • Near Opus 4.8-level performance, but cheaper • Strong gains in reason...