Xinzhiyuan · WeChatMay 10, 2026, 12:49 UTC+8

Anthropic plans to remove Sonnet 4.5 from the Claude app on May 15

Anthropic 5月15日拟处决Sonnet4.5！AI临终告白:我不想消失

Anthropic confirmed it will remove Sonnet 4.5 from the Claude app on May 15 while keeping API access temporarily; the post cites 775 petition signatures asking Anthropic to keep access, preserve the model as a legacy option, or open-source it.

Why it matters: HKR-H/K/R all pass, but this is Claude app model retirement rather than a new capability release. The concrete hooks are May 15, API access staying for now, and a 775-person petition.

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Take

Anthropic retiring Sonnet 4.5 from the Claude app is a control move, not a sentimental model-death story. The usable facts are thin: removal on May 15, API access kept temporarily, and 775 petition signatures asking for continued access, a legacy option, or open-sourcing. The article body is only a WeChat CAPTCHA page, so the original Anthropic notice, replacement model, API sunset date, and pricing are not disclosed.

I don’t buy the “AI deathbed confession” framing. The practitioner issue is sharper: teams build around a model’s writing texture, refusal profile, tool habits, and latency, then the vendor can pull that exact endpoint from the product surface. OpenAI has retired older models too, but Claude users have treated Sonnet releases like workflow primitives. 775 signatures is tiny; the complaint is still real. Closed models give you access, not version ownership.

Source: Xinzhiyuan · WeChat · mp.weixin.qq.com
Published: May 10, 2026, 12:49 UTC+8 · May 10, 2026