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data-files-api-reference-go.md

File metadata and controls

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Files API — Go

Files API (Beta)

Under client.Beta.Files. Method is Upload (NOT New/Create), params struct is BetaFileUploadParams. The File field takes an io.Reader; use anthropic.File() to attach a filename + content-type for the multipart encoding.

f, _ := os.Open("./upload_me.txt")
defer f.Close()

meta, err := client.Beta.Files.Upload(ctx, anthropic.BetaFileUploadParams{
    File:  anthropic.File(f, "upload_me.txt", "text/plain"),
    Betas: []anthropic.AnthropicBeta{anthropic.AnthropicBetaFilesAPI2025_04_14},
})
// meta.ID is the file_id to reference in subsequent message requests

Other Beta.Files methods: List, Delete, Download, GetMetadata.