go changedcli-sdks-libraries/sdks/go
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1414
1515```go
1616import (
17 "github.com/anthropics/anthropic-sdk-go" // imported as anthropic
17 "github.com/anthropics/anthropic-sdk-go/v2" // imported as anthropic
1818)
1919```
2020
from line 21
2121Install with `go get`:
2222
2323```bash
24go get github.com/anthropics/anthropic-sdk-go
24go get github.com/anthropics/anthropic-sdk-go/v2
2525```
2626
2727## Requirements
from line 37
3737 "context"
3838 "fmt"
3939
40 "github.com/anthropics/anthropic-sdk-go"
41 "github.com/anthropics/anthropic-sdk-go/option"
40 "github.com/anthropics/anthropic-sdk-go/v2"
41 "github.com/anthropics/anthropic-sdk-go/v2/option"
4242)
4343
4444func main() {
from line 458
458458```go
459459_, err := client.Messages.New(context.TODO(), anthropic.MessageNewParams{
460460 MaxTokens: 1024,
461 Messages: []anthropic.MessageParam{{
462 Content: []anthropic.ContentBlockParamUnion{{
463 OfText: &anthropic.TextBlockParam{
464 Text: "What is a quaternion?",
465 },
466 }},
467 Role: anthropic.MessageParamRoleUser,
468 }},
461 Messages: []anthropic.MessageParam{
462 anthropic.NewUserMessage(anthropic.NewTextBlock("What is a quaternion?")),
463 },
469464 Model: anthropic.ModelClaudeOpus5_5,
470465})
471466if err != nil {
from line 494
499494 context.TODO(),
500495 anthropic.MessageNewParams{
501496 MaxTokens: 1024,
502 Messages: []anthropic.MessageParam{{
503 Content: []anthropic.ContentBlockParamUnion{{
504 OfText: &anthropic.TextBlockParam{
505 Text: "What is a quaternion?",
506 },
507 }},
508 Role: anthropic.MessageParamRoleUser,
509 }},
497 Messages: []anthropic.MessageParam{
498 anthropic.NewUserMessage(anthropic.NewTextBlock("What is a quaternion?")),
499 },
510500 Model: anthropic.ModelClaudeOpus5_5,
511501 },
512502 option.WithMaxRetries(5),
from line 518
528518 ctx,
529519 anthropic.MessageNewParams{
530520 MaxTokens: 1024,
531 Messages: []anthropic.MessageParam{{
532 Content: []anthropic.ContentBlockParamUnion{{
533 OfText: &anthropic.TextBlockParam{
534 Text: "What is a quaternion?",
535 },
536 }},
537 Role: anthropic.MessageParamRoleUser,
538 }},
521 Messages: []anthropic.MessageParam{
522 anthropic.NewUserMessage(anthropic.NewTextBlock("What is a quaternion?")),
523 },
539524 Model: anthropic.ModelClaudeOpus5_5,
540525 },
541526 // This sets the per-retry timeout
from line 614
629614
630615The request option `option.WithDebugLog(nil)` might be helpful while debugging.
631616
632See the [full list of request options](https://pkg.go.dev/github.com/anthropics/anthropic-sdk-go/option).
617See the [full list of request options](https://pkg.go.dev/github.com/anthropics/anthropic-sdk-go/v2/option).
633618
634619## HTTP client customization
635620
from line 634
649634
650635The Go SDK supports the following platforms:
651636
652* **Agent Platform:** `import "github.com/anthropics/anthropic-sdk-go/vertex"`. Use `vertex.WithGoogleAuth(ctx, region, projectID)` or `vertex.WithCredentials(ctx, region, projectID, creds)`.
653* **Bedrock:** `import "github.com/anthropics/anthropic-sdk-go/bedrock"`. Use `bedrock.NewMantleClient` for the Messages-API Bedrock endpoint (streams over SSE), or `bedrock.WithLoadDefaultConfig(ctx)` / `bedrock.WithConfig(cfg)` (`bedrock-runtime` path). Importing the `bedrock` package globally registers a decoder for `application/vnd.amazon.eventstream` with the SDK's streaming layer (through package `init()`). This applies whether you use the `bedrock-runtime` `WithConfig`/`WithLoadDefaultConfig` path or `NewMantleClient`.
654* **Claude Platform on AWS:** `import anthropicaws "github.com/anthropics/anthropic-sdk-go/aws"`. Use `anthropicaws.NewClient(ctx, cfg)` with an `anthropicaws.ClientConfig` value to construct a client; set `WorkspaceID` on the config or the `ANTHROPIC_AWS_WORKSPACE_ID` environment variable. The `anthropicaws` import alias avoids a name collision with `github.com/aws/aws-sdk-go-v2/aws` when both are imported. Available in beta.
655* **Foundry:** `import "github.com/anthropics/anthropic-sdk-go/foundry"`. Use `foundry.NewClient(cfg)` with a `foundry.ClientConfig` value to construct a client; set `APIKey` (or `AzureADTokenProvider` for Microsoft Entra ID) and `Resource` on the config, or the `ANTHROPIC_FOUNDRY_API_KEY` and `ANTHROPIC_FOUNDRY_RESOURCE` environment variables.
637* **Agent Platform:** `import "github.com/anthropics/anthropic-sdk-go/v2/vertex"`. Use `vertex.WithGoogleAuth(ctx, region, projectID)` or `vertex.WithCredentials(ctx, region, projectID, creds)`.
638* **Bedrock:** `import "github.com/anthropics/anthropic-sdk-go/v2/bedrock"`. Use `bedrock.NewMantleClient` for the Messages-API Bedrock endpoint (streams over SSE), or `bedrock.WithLoadDefaultConfig(ctx)` / `bedrock.WithConfig(cfg)` (`bedrock-runtime` path). Importing the `bedrock` package globally registers a decoder for `application/vnd.amazon.eventstream` with the SDK's streaming layer (through package `init()`). This applies whether you use the `bedrock-runtime` `WithConfig`/`WithLoadDefaultConfig` path or `NewMantleClient`.
639* **Claude Platform on AWS:** `import anthropicaws "github.com/anthropics/anthropic-sdk-go/v2/aws"`. Use `anthropicaws.NewClient(ctx, cfg)` with an `anthropicaws.ClientConfig` value to construct a client; set `WorkspaceID` on the config or the `ANTHROPIC_AWS_WORKSPACE_ID` environment variable. The `anthropicaws` import alias avoids a name collision with `github.com/aws/aws-sdk-go-v2/aws` when both are imported. Available in beta.
640* **Foundry:** `import "github.com/anthropics/anthropic-sdk-go/v2/foundry"`. Use `foundry.NewClient(cfg)` with a `foundry.ClientConfig` value to construct a client; set `APIKey` (or `AzureADTokenProvider` for Microsoft Entra ID) and `Resource` on the config, or the `ANTHROPIC_FOUNDRY_API_KEY` and `ANTHROPIC_FOUNDRY_RESOURCE` environment variables.
656641
657642Use `bedrock.NewMantleClient` for new projects; `bedrock.WithLoadDefaultConfig`/`WithConfig` remain for existing applications using the Bedrock `InvokeModel` API.
658643
from line 654
669654 context.TODO(),
670655 anthropic.MessageNewParams{
671656 MaxTokens: 1024,
672 Messages: []anthropic.MessageParam{{
673 Content: []anthropic.ContentBlockParamUnion{{
674 OfText: &anthropic.TextBlockParam{
675 Text: "What is a quaternion?",
676 },
677 }},
678 Role: anthropic.MessageParamRoleUser,
679 }},
657 Messages: []anthropic.MessageParam{
658 anthropic.NewUserMessage(anthropic.NewTextBlock("What is a quaternion?")),
659 },
680660 Model: anthropic.ModelClaudeOpus5_5,
681661 },
682662 option.WithResponseInto(&response),
from line 730
750730## Additional resources
751731
752732* [GitHub repository](https://github.com/anthropics/anthropic-sdk-go)
753* [Go package documentation](https://pkg.go.dev/github.com/anthropics/anthropic-sdk-go)
733* [Go package documentation](https://pkg.go.dev/github.com/anthropics/anthropic-sdk-go/v2)
754734* [API reference](https://platform.claude.com/docs/en/api/overview)
755735* [Streaming Messages](https://platform.claude.com/docs/en/build-with-claude/streaming)
756736
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