#semver

No Matching Version Found for @anthropic-ai/sdk: There Is No 1.x on npm (2026)

npm error notarget No matching version found for @anthropic-ai/sdk means you asked for a major that does not exist. Anthropic ships two SDKs on unrelated version lines: Python is on 1.5.0, npm has never left 0.x. Read from both registries, with the caret trap that follows.