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feat: add Betas support for Anthropic provider options #151

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feat: add Betas support for Anthropic provider options #151

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21 changes: 13 additions & 8 deletions providers/anthropic/anthropic.go
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Original file line number Diff line number Diff line change
Expand Up @@ -216,19 +216,24 @@ func (a languageModel) Provider() string {
return a.provider
}

func (a languageModel) prepareParams(call fantasy.Call) (*anthropic.MessageNewParams, []fantasy.CallWarning, error) {
func (a languageModel) prepareParams(call fantasy.Call) (*anthropic.MessageNewParams, []option.RequestOption, []fantasy.CallWarning, error) {
params := &anthropic.MessageNewParams{}
var requestOpts []option.RequestOption
providerOptions := &ProviderOptions{}
if v, ok := call.ProviderOptions[Name]; ok {
providerOptions, ok = v.(*ProviderOptions)
if !ok {
return nil, nil, &fantasy.Error{Title: "invalid argument", Message: "anthropic provider options should be *anthropic.ProviderOptions"}
return nil, nil, nil, &fantasy.Error{Title: "invalid argument", Message: "anthropic provider options should be *anthropic.ProviderOptions"}
}
}
sendReasoning := true
if providerOptions.SendReasoning != nil {
sendReasoning = *providerOptions.SendReasoning
}
// Add beta headers for features like 1M context window on Bedrock
for _, beta := range providerOptions.Betas {
requestOpts = append(requestOpts, option.WithHeaderAdd("anthropic-beta", beta))
}
systemBlocks, messages, warnings := toPrompt(call.Prompt, sendReasoning)

if call.FrequencyPenalty != nil {
Expand Down Expand Up @@ -273,7 +278,7 @@ func (a languageModel) prepareParams(call fantasy.Call) (*anthropic.MessageNewPa
params.Thinking.OfAdaptive = &adaptive
case providerOptions.Thinking != nil:
if providerOptions.Thinking.BudgetTokens == 0 {
return nil, nil, &fantasy.Error{Title: "no budget", Message: "thinking requires budget"}
return nil, nil, nil, &fantasy.Error{Title: "no budget", Message: "thinking requires budget"}
}
params.Thinking = anthropic.ThinkingConfigParamOfEnabled(providerOptions.Thinking.BudgetTokens)
if call.Temperature != nil {
Expand Down Expand Up @@ -315,7 +320,7 @@ func (a languageModel) prepareParams(call fantasy.Call) (*anthropic.MessageNewPa
warnings = append(warnings, toolWarnings...)
}

return params, warnings, nil
return params, requestOpts, warnings, nil
}

func (a *provider) Name() string {
Expand Down Expand Up @@ -767,11 +772,11 @@ func mapFinishReason(finishReason string) fantasy.FinishReason {

// Generate implements fantasy.LanguageModel.
func (a languageModel) Generate(ctx context.Context, call fantasy.Call) (*fantasy.Response, error) {
params, warnings, err := a.prepareParams(call)
params, requestOpts, warnings, err := a.prepareParams(call)
if err != nil {
return nil, err
}
response, err := a.client.Messages.New(ctx, *params)
response, err := a.client.Messages.New(ctx, *params, requestOpts...)
if err != nil {
return nil, toProviderErr(err)
}
Expand Down Expand Up @@ -844,12 +849,12 @@ func (a languageModel) Generate(ctx context.Context, call fantasy.Call) (*fantas

// Stream implements fantasy.LanguageModel.
func (a languageModel) Stream(ctx context.Context, call fantasy.Call) (fantasy.StreamResponse, error) {
params, warnings, err := a.prepareParams(call)
params, requestOpts, warnings, err := a.prepareParams(call)
if err != nil {
return nil, err
}

stream := a.client.Messages.NewStreaming(ctx, *params)
stream := a.client.Messages.NewStreaming(ctx, *params, requestOpts...)
acc := anthropic.Message{}
return func(yield func(fantasy.StreamPart) bool) {
if len(warnings) > 0 {
Expand Down
2 changes: 2 additions & 0 deletions providers/anthropic/provider_options.go
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Original file line number Diff line number Diff line change
Expand Up @@ -61,6 +61,8 @@ type ProviderOptions struct {
Thinking *ThinkingProviderOption `json:"thinking"`
Effort *Effort `json:"effort"`
DisableParallelToolUse *bool `json:"disable_parallel_tool_use"`
// Betas is a list of beta features to enable (e.g., "context-1m-2025-08-07" for 1M context on Bedrock).
Betas []string `json:"betas,omitempty"`
}

// Options implements the ProviderOptions interface.
Expand Down