Anthropic 发布 Claude Sonnet 5.5
Claude Sonnet 5.5
Anthropic 发布 Claude Sonnet 5.5，官方称运行速度提升 30% 以上、多数工作成本最多降低 30%，定价与 Sonnet 5 相同但在各项基准上均优于前者。Simon Willison 实测发现，该模型在部分编码任务上接近 Opus 5.5，并已成为 claude.ai 免费层所用模型；但 max 思考档位下出现与 Opus 5.5 相同的缺陷，思考 128,000 token 后耗尽预算仍未能生成 SVG。Anthropic 表示 Haiku 5.5 将在未来几周内推出。
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作者实测了 Sonnet 5.5 的免费层表现与思考预算问题，可据此判断它在编码任务上的实际水平。
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28th September 2026 - Link Blog
Claude Sonnet 5.5 . New Sonnet model from Anthropic today. They say it "runs 30%+ faster, and costs up to 30% less for most work" - it's priced the same as Sonnet 5 but appears to beat it on every benchmark, and should be cheaper to run as well.
Here are some pelicans riding bicycles . Sonnet 5.5 suffered from the same bug as Opus 5.5 : the "max" thinking effort pelican thought for 128,000 tokens (at a cost of $1.28) before running out of tokens and failing to produce an SVG.
Here's the pelican it gave me for thinking effort "xhigh", at a cost of 5.74 cents and taking 41 seconds:
Sonnet 5.5 appears to be almost as good as Opus 5.5 on some coding tasks, including various viral 3D animation tricks .
The most interesting thing about Sonnet 5.5 is that it's now the model used for the free tier on claude.ai . OpenAI's ChatGPT free tier uses Luna 5.6, which means Anthropic currently have a much more capable free offering.
I ran this prompt against that free tier:
build me an HTML page that renders a three-dimensional pelican riding a bicycle using WebGL
And got back this page , which is a solid effort.
Anthropic's announcement reiterates that Haiku 5.5 will be available "in the coming weeks". I really hope that one is price-competitive with GPT-6 Luna!
This is a link post by Simon Willison, posted on 28th September 2026 .
Pay me to send you less!