Upload File

client.Beta.Files.Upload(ctx, params) (*FileMetadata, error)

POST/v1/files

Upload File

ParametersExpand Collapse

params BetaFileUploadParams

File param.Field[Reader]

Body param: The file to upload

Betas param.Field[[]AnthropicBeta]optional

Header param: Optional header to specify the beta version(s) you want to use.

string

type AnthropicBeta string

Accepts one of the following:

const AnthropicBetaMessageBatches2024_09_24 AnthropicBeta = "message-batches-2024-09-24"

const AnthropicBetaPromptCaching2024_07_31 AnthropicBeta = "prompt-caching-2024-07-31"

const AnthropicBetaComputerUse2024_10_22 AnthropicBeta = "computer-use-2024-10-22"

const AnthropicBetaComputerUse2025_01_24 AnthropicBeta = "computer-use-2025-01-24"

const AnthropicBetaPDFs2024_09_25 AnthropicBeta = "pdfs-2024-09-25"

const AnthropicBetaTokenCounting2024_11_01 AnthropicBeta = "token-counting-2024-11-01"

const AnthropicBetaTokenEfficientTools2025_02_19 AnthropicBeta = "token-efficient-tools-2025-02-19"

const AnthropicBetaOutput128k2025_02_19 AnthropicBeta = "output-128k-2025-02-19"

const AnthropicBetaFilesAPI2025_04_14 AnthropicBeta = "files-api-2025-04-14"

const AnthropicBetaMCPClient2025_04_04 AnthropicBeta = "mcp-client-2025-04-04"

const AnthropicBetaMCPClient2025_11_20 AnthropicBeta = "mcp-client-2025-11-20"

const AnthropicBetaDevFullThinking2025_05_14 AnthropicBeta = "dev-full-thinking-2025-05-14"

const AnthropicBetaInterleavedThinking2025_05_14 AnthropicBeta = "interleaved-thinking-2025-05-14"

const AnthropicBetaCodeExecution2025_05_22 AnthropicBeta = "code-execution-2025-05-22"

const AnthropicBetaExtendedCacheTTL2025_04_11 AnthropicBeta = "extended-cache-ttl-2025-04-11"

const AnthropicBetaContext1m2025_08_07 AnthropicBeta = "context-1m-2025-08-07"

const AnthropicBetaContextManagement2025_06_27 AnthropicBeta = "context-management-2025-06-27"

const AnthropicBetaModelContextWindowExceeded2025_08_26 AnthropicBeta = "model-context-window-exceeded-2025-08-26"

const AnthropicBetaSkills2025_10_02 AnthropicBeta = "skills-2025-10-02"

const AnthropicBetaFastMode2026_02_01 AnthropicBeta = "fast-mode-2026-02-01"

ReturnsExpand Collapse

type FileMetadata struct{…}

ID string

Unique object identifier.

The format and length of IDs may change over time.

CreatedAt Time

RFC 3339 datetime string representing when the file was created.

Filename string

Original filename of the uploaded file.

MimeType string

MIME type of the file.

SizeBytes int64

Size of the file in bytes.

Type File

Object type.

For files, this is always "file".

Downloadable booloptional

Whether the file can be downloaded.

Upload File

package main

import (
  "bytes"
  "context"
  "fmt"
  "io"

  "github.com/anthropics/anthropic-sdk-go"
  "github.com/anthropics/anthropic-sdk-go/option"
)

func main() {
  client := anthropic.NewClient(
    option.WithAPIKey("my-anthropic-api-key"),
  )
  fileMetadata, err := client.Beta.Files.Upload(context.TODO(), anthropic.BetaFileUploadParams{
    File: io.Reader(bytes.NewBuffer([]byte("Example data"))),
  })
  if err != nil {
    panic(err.Error())
  }
  fmt.Printf("%+v\n", fileMetadata.ID)
}

Response 200

{
  "id": "file_011CNha8iCJcU1wXNR6q4V8w",
  "created_at": "2025-04-15T18:37:24.100435Z",
  "filename": "document.pdf",
  "mime_type": "application/pdf",
  "size_bytes": 102400,
  "type": "file",
  "downloadable": false
}

Returns Examples

Response 200

{
  "id": "file_011CNha8iCJcU1wXNR6q4V8w",
  "created_at": "2025-04-15T18:37:24.100435Z",
  "filename": "document.pdf",
  "mime_type": "application/pdf",
  "size_bytes": 102400,
  "type": "file",
  "downloadable": false
}

package main import ( "bytes" "context" "fmt" "io" "github.com/anthropics/anthropic-sdk-go" "github.com/anthropics/anthropic-sdk-go/option" ) func main() { client := anthropic.NewClient( option.WithAPIKey("my-anthropic-api-key"), ) fileMetadata, err := client.Beta.Files.Upload(context.TODO(), anthropic.BetaFileUploadParams{ File: io.Reader(bytes.NewBuffer([]byte("Example data"))), }) if err != nil { panic(err.Error()) } fmt.Printf("%+v\n", fileMetadata.ID) }

{ "id": "file_011CNha8iCJcU1wXNR6q4V8w", "created_at": "2025-04-15T18:37:24.100435Z", "filename": "document.pdf", "mime_type": "application/pdf", "size_bytes": 102400, "type": "file", "downloadable": false }