From 0cbfe7f4575b9df16f31d61c513bd660682367af Mon Sep 17 00:00:00 2001
From: Alexey Yanchenko <your.elkin@gmail.com>
Date: Fri, 20 Feb 2026 10:25:44 +0700
Subject: [PATCH] Pass file input from /chat/completions and /responses to
 codex and claude

---
 .../chat-completions/claude_openai_request.go | 15 +++++++++++
 .../claude_openai-responses_request.go        | 27 ++++++++++++++++++-
 .../chat-completions/codex_openai_request.go  | 14 +++++++++-
 3 files changed, 54 insertions(+), 2 deletions(-)

diff --git a/internal/translator/claude/openai/chat-completions/claude_openai_request.go b/internal/translator/claude/openai/chat-completions/claude_openai_request.go
index 3cad1882..f94825b2 100644
--- a/internal/translator/claude/openai/chat-completions/claude_openai_request.go
+++ b/internal/translator/claude/openai/chat-completions/claude_openai_request.go
@@ -199,6 +199,21 @@ func ConvertOpenAIRequestToClaude(modelName string, inputRawJSON []byte, stream
 									msg, _ = sjson.SetRaw(msg, "content.-1", imagePart)
 								}
 							}
+
+						case "file":
+							fileData := part.Get("file.file_data").String()
+							if strings.HasPrefix(fileData, "data:") {
+								semicolonIdx := strings.Index(fileData, ";")
+								commaIdx := strings.Index(fileData, ",")
+								if semicolonIdx != -1 && commaIdx != -1 && commaIdx > semicolonIdx {
+									mediaType := strings.TrimPrefix(fileData[:semicolonIdx], "data:")
+									data := fileData[commaIdx+1:]
+									docPart := `{"type":"document","source":{"type":"base64","media_type":"","data":""}}`
+									docPart, _ = sjson.Set(docPart, "source.media_type", mediaType)
+									docPart, _ = sjson.Set(docPart, "source.data", data)
+									msg, _ = sjson.SetRaw(msg, "content.-1", docPart)
+								}
+							}
 						}
 						return true
 					})
diff --git a/internal/translator/claude/openai/responses/claude_openai-responses_request.go b/internal/translator/claude/openai/responses/claude_openai-responses_request.go
index 337f9be9..33a81124 100644
--- a/internal/translator/claude/openai/responses/claude_openai-responses_request.go
+++ b/internal/translator/claude/openai/responses/claude_openai-responses_request.go
@@ -155,6 +155,7 @@ func ConvertOpenAIResponsesRequestToClaude(modelName string, inputRawJSON []byte
 				var textAggregate strings.Builder
 				var partsJSON []string
 				hasImage := false
+				hasFile := false
 				if parts := item.Get("content"); parts.Exists() && parts.IsArray() {
 					parts.ForEach(func(_, part gjson.Result) bool {
 						ptype := part.Get("type").String()
@@ -207,6 +208,30 @@ func ConvertOpenAIResponsesRequestToClaude(modelName string, inputRawJSON []byte
 									hasImage = true
 								}
 							}
+						case "input_file":
+							fileData := part.Get("file_data").String()
+							if fileData != "" {
+								mediaType := "application/octet-stream"
+								data := fileData
+								if strings.HasPrefix(fileData, "data:") {
+									trimmed := strings.TrimPrefix(fileData, "data:")
+									mediaAndData := strings.SplitN(trimmed, ";base64,", 2)
+									if len(mediaAndData) == 2 {
+										if mediaAndData[0] != "" {
+											mediaType = mediaAndData[0]
+										}
+										data = mediaAndData[1]
+									}
+								}
+								contentPart := `{"type":"document","source":{"type":"base64","media_type":"","data":""}}`
+								contentPart, _ = sjson.Set(contentPart, "source.media_type", mediaType)
+								contentPart, _ = sjson.Set(contentPart, "source.data", data)
+								partsJSON = append(partsJSON, contentPart)
+								if role == "" {
+									role = "user"
+								}
+								hasFile = true
+							}
 						}
 						return true
 					})
@@ -228,7 +253,7 @@ func ConvertOpenAIResponsesRequestToClaude(modelName string, inputRawJSON []byte
 				if len(partsJSON) > 0 {
 					msg := `{"role":"","content":[]}`
 					msg, _ = sjson.Set(msg, "role", role)
-					if len(partsJSON) == 1 && !hasImage {
+					if len(partsJSON) == 1 && !hasImage && !hasFile {
 						// Preserve legacy behavior for single text content
 						msg, _ = sjson.Delete(msg, "content")
 						textPart := gjson.Parse(partsJSON[0])
diff --git a/internal/translator/codex/openai/chat-completions/codex_openai_request.go b/internal/translator/codex/openai/chat-completions/codex_openai_request.go
index e79f97cd..1ea9ca4b 100644
--- a/internal/translator/codex/openai/chat-completions/codex_openai_request.go
+++ b/internal/translator/codex/openai/chat-completions/codex_openai_request.go
@@ -180,7 +180,19 @@ func ConvertOpenAIRequestToCodex(modelName string, inputRawJSON []byte, stream b
 								msg, _ = sjson.SetRaw(msg, "content.-1", part)
 							}
 						case "file":
-							// Files are not specified in examples; skip for now
+							if role == "user" {
+								fileData := it.Get("file.file_data").String()
+								filename := it.Get("file.filename").String()
+								if fileData != "" {
+									part := `{}`
+									part, _ = sjson.Set(part, "type", "input_file")
+									part, _ = sjson.Set(part, "file_data", fileData)
+									if filename != "" {
+										part, _ = sjson.Set(part, "filename", filename)
+									}
+									msg, _ = sjson.SetRaw(msg, "content.-1", part)
+								}
+							}
 						}
 					}
 				}