Anthropic 发布双版本 Claude 5.2 模型编码推理能力大幅跃升Simon Willison 博客T2·开发与工程

Anthropic 发布 Fable 5.2 与 Mythos 5.2 双模型

原标题：llm-anthropic 0.31

58AI 研判分

Anthropic 今日发布 Fable 5.2 与 Mythos 5.2 两款新模型，社区工具 llm-anthropic 已同步支持。实测显示模型提供 low 至 max 五档推理强度，xhigh 档生成的 SVG 质量最佳，而 max 档在消耗 12.8 万 token 思考后未能输出图像，暴露出与旧版相同的 token 耗尽缺陷。

关联知识实体

公司Anthropic 工具llm-anthropic 模型Mythos 5.2 模型Fable 5.2 术语推理努力度

报道正文

Anthropic released Fable 5.2 and Mythos 5.2 today. I've added them to llm-anthropic, so you can now run prompts through Fable 5.2 like this:

文本

uv tool install llm
llm install llm-anthropic
llm keys set anthropic
# paste key here
llm -m claude-fable-5.2 "Generate an SVG of a pelican riding a bicycle"

I ran pelicans at all five reasoning levels - low, medium, high, xhigh, and max. You can see them all here - here's the best result I got, from xhigh:

It's good - legs the right side of the bicycle, good frame, nice pouch, weird little fingers on the handlebars. The pouch looks slightly misaligned with the top of the beak.

max failed to return an image at all, running out of tokens after spending 128,000 thinking about them. That's the same bug that I saw with Opus 5.5 - but it's new for the Fable series, both Fable 5 and Fable 5.1 returned max effort pelicans just fine.

Tags: llm, anthropic, claude, generative-ai, pelican-riding-a-bicycle, ai, llms, claude-mythos-fable