Simon Willison 实测 Claude Sonnet 5.5：速度与成本均有改善

Claude Sonnet 5.5

乔木风格重写（向阳乔木 · deepseek-v4-flash）：Anthropic 今天发布了 Claude Sonnet 5.5。官方说法是： 运行速度快了 30% 以上，大多数任务的成本最多降低 30%。 定价和 Sonnet 5 持平，但每一项基准测试都赢了它，实际跑起来还更便宜。这种“加量不加价”的升级，在模型迭代里并不常见。 那只骑自行车的鹈鹕，又翻车了 照例先看骑自行车的鹈鹕。 Sonnet 5.5 犯了和...

Claude Sonnet 5.5

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! Tags: ai, generative-ai, llms, anthropic, claude, pelican-riding-a-bicycle, llm-release

More on Sonnet 5.5 https://simonwillison.net/2026/Sep/28/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 …