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fix: improve Anthropic adaptor compatibility #2405

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fix: improve Anthropic adaptor compatibility #2405

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18 changes: 15 additions & 3 deletions relay/adaptor/anthropic/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -32,7 +32,8 @@ func stopReasonClaude2OpenAI(reason *string) string {
case "tool_use":
return "tool_calls"
default:
return *reason
// unknown stop reason, map to "stop" to avoid client errors
return "stop"
}
}

Expand Down Expand Up @@ -157,6 +158,10 @@ func StreamResponseClaude2OpenAI(claudeResponse *StreamResponse) (*openai.ChatCo
return nil, claudeResponse.Message
case "content_block_start":
if claudeResponse.ContentBlock != nil {
// skip thinking blocks, OpenAI doesn't support them
if claudeResponse.ContentBlock.Type == "thinking" {
return nil, nil
}
responseText = claudeResponse.ContentBlock.Text
if claudeResponse.ContentBlock.Type == "tool_use" {
tools = append(tools, model.Tool{
Expand All @@ -171,6 +176,10 @@ func StreamResponseClaude2OpenAI(claudeResponse *StreamResponse) (*openai.ChatCo
}
case "content_block_delta":
if claudeResponse.Delta != nil {
// skip thinking deltas, OpenAI doesn't support them
if claudeResponse.Delta.Type == "thinking_delta" || claudeResponse.Delta.Type == "signature_delta" {
return nil, nil
}
responseText = claudeResponse.Delta.Text
if claudeResponse.Delta.Type == "input_json_delta" {
tools = append(tools, model.Tool{
Expand All @@ -189,6 +198,9 @@ func StreamResponseClaude2OpenAI(claudeResponse *StreamResponse) (*openai.ChatCo
if claudeResponse.Delta != nil && claudeResponse.Delta.StopReason != nil {
stopReason = *claudeResponse.Delta.StopReason
}
default:
// content_block_stop, message_stop and other control events produce no OpenAI chunk
return nil, nil
}
var choice openai.ChatCompletionsStreamResponseChoice
choice.Delta.Content = responseText
Expand All @@ -197,8 +209,8 @@ func StreamResponseClaude2OpenAI(claudeResponse *StreamResponse) (*openai.ChatCo
choice.Delta.ToolCalls = tools
}
choice.Delta.Role = "assistant"
finishReason := stopReasonClaude2OpenAI(&stopReason)
if finishReason != "null" {
if stopReason != "" {
finishReason := stopReasonClaude2OpenAI(&stopReason)
choice.FinishReason = &finishReason
}
var openaiResponse openai.ChatCompletionsStreamResponse
Expand Down