{"_id": {"$oid": "6ac4c7b5164e0f17c0b23354"}, "test_id": "T1130", "benchmark": "business_letters", "date": "2026-06-05", "tags": {"document-type": ["letter"], "writing": ["typed", "handwritten"], "century": [20], "language": ["de"], "layout": ["prose"], "entry-type": ["person", "location"], "task": ["information-extraction"]}, "contributors": ["eric_decker", "maximilian_hindermann", "lea_kasper", "anthea_alberto", "pema_frick", "jose_luis_losada_palenzuela", "sorin_marti", "elena_spadini"], "hidden": false, "config": {"provider": "openrouter", "model": "stepfun/step-3.7-flash", "dataclass": "Document", "temperature": 0.0, "role_description": "You are a historian with keyword knowledge and an expert in the field of 20th century Swiss history", "prompt_file": "prompt.txt", "rules": "{\"skip_signatures\": true, \"skip_non_signatures\": false}", "legacy_test": false}, "prompt": "            IDENTITY and PURPOSE:\n\n            You are presented with a series of images constituting a historical letter. Your task is to extract the\n            values of the following keys from the letter and return them in a JSON file where the values\n            corresponding to each key should be stored as a list, even if there is only a single value for a\n            key:\n\n            - letter_title: Title of the letter.\n            - sender_persons: Name(s) of the person(s) who wrote the letter.\n            - send_date: The exact or approximate date the letter was written.\n            - receiver_persons: Name(s) of the person(s) who received the letter.\n\n            Take a deep breath and think step by step about how to best accomplish this goal. Map out all the claims\n            and implications on a virtual whiteboard in your mind. Do not use OCR. Use the ISO format YYYY-MM-DD for\n            dates. If a piece of information is not included in the letter, set the value for the corresponding key\n            to \"null\". Do not return anything except the JSON file.\n\n            EXAMPLE:\n\n            {\n                \"letter_title\": [\"Petition for Environmental Protection\"],\n                \"send_date\": [\"1993-03-12\"],\n                \"sender_persons\": [\"Lisa Simpson\"],\n                \"receiver_persons\": [\"Mayor Joe Quimby\", \"Seymour Skinner\"],\n            }\n\n            OUTPUT:", "results": {"text": "{\"metadata\":{\"send_date\":[\"1926-03-29\"],\"letter_title\":[\"\"],\"sender_persons\":[\"\"],\"receiver_persons\":[\"Dr.W.Krasting\"]}}", "model": "stepfun/step-3.7-flash-20260528", "provider": "openrouter", "finish_reason": "stop", "usage": {"input_tokens": 1503, "output_tokens": 1955, "total_tokens": 3458, "input_cost_usd": 0.00030060000000000004, "output_cost_usd": 0.00224825, "estimated_cost_usd": 0.00254885}, "duration": 120.80365180969238, "timestamp": "2026-06-05T13:14:36.834505", "parsed": {"metadata": {"send_date": ["1926-03-29"], "letter_title": [""], "sender_persons": [""], "receiver_persons": ["Dr.W.Krasting"], "document_number": "letter05"}}, "conversation_id": "051fde5b-194b-4c09-b077-e00f2609ccce", "score": {"send_date_tp": 1, "send_date_fp": 0, "send_date_fn": 0, "sender_persons_tp": 0, "sender_persons_fp": 0, "sender_persons_fn": 0, "receiver_persons_tp": 0, "receiver_persons_fp": 1, "receiver_persons_fn": 1}, "raw_response": "{\"id\":\"gen-1780658052-VMrIcRtXp7o1IIcdeAm5\",\"choices\":[{\"finish_reason\":\"stop\",\"index\":0,\"logprobs\":null,\"message\":{\"content\":\"{\\n    \\\"metadata\\\": {\\n      \\\"send_date\\\": [\\\"1926-03-29\\\"],\\n      \\\"letter_title\\\": [\\\"\\\"],\\n      \\\"sender_persons\\\": [\\\"\\\"],\\n      \\\"receiver_persons\\\": [\\\"Dr.W.Krasting\\\"]\\n    }\\n  }\",\"refusal\":null,\"role\":\"assistant\",\"annotations\":null,\"audio\":null,\"function_call\":null,\"tool_calls\":null,\"parsed\":{\"metadata\":{\"send_date\":[\"1926-03-29\"],\"letter_title\":[\"\"],\"sender_persons\":[\"\"],\"receiver_persons\":[\"Dr.W.Krasting\"]}},\"reasoning\":\"The user wants me to extract specific information from a historical letter image and return it as JSON. Let me analyze the image carefully.\\n\\n First, let's look at the content:\\n - Date: \\\"Basel, den 29. M\u00e4rz 1926.\\\" - This is the date of the letter: March 29, 1926\\n - Recipient: \\\"Herrn Dr.W.Krasting,\\\" - This is the receiver\\n - Organization mentioned: \\\"Internationale Ausstellung f\u00fcr Binnenschiffahrt und Wasserkraftnutzung Basel 1926\\\" - This appears to be the organization/event, not the sender\\n - Place: \\\"Basel\\\" (centered)\\n - Body text: Confirms receipt of a letter from March 26, mentions discussions among board members about an operating community, and mentions they will soon make a proposal.\\n - Closing: \\\"Hochachtungsvoll\\\" (Yours faithfully/respectfully)\\n - No signature visible at the bottom, but the letter is from Basel\\n\\n Wait, I need to identify the sender. The letter is written from Basel, but who is the sender? The letterhead doesn't clearly show a sender name at the top. It just says \\\"Basel, den 29. M\u00e4rz 1926.\\\" and then \\\"T\\\" (possibly indicating the start of the text).\\n\\n Looking at the recipient: \\\"Herrn Dr.W.Krasting,\\\" - so Dr. W. Krasting is the receiver.\\n\\n The sender is not explicitly named in the visible portion. The letter is from Basel, and mentions \\\"unserer Vorstandsmitglieder\\\" (our board members), suggesting it's from an organization, but the specific sender name isn't visible in the image.\\n\\n Actually, looking more carefully at the text:\\n - \\\"Ich best\u00e4tige Ihnen dankend den Erhalt Ihres Schreibens vom 26. dies...\\\" - \\\"I confirm receipt of your letter of the 26th...\\\"\\n - The sender is writing to Dr. W. Krasting\\n - The sender mentions \\\"unserer Vorstandsmitglieder\\\" (our board members)\\n - The organization mentioned is \\\"Internationale Ausstellung f\u00fcr Binnenschiffahrt und Wasserkraftnutzung Basel 1926\\\"\\n\\n But who is the specific sender? The letter doesn't have a signature visible, and the sender's name isn't explicitly stated in the header. The header only shows the date and location.\\n\\n Wait, looking at the layout:\\n - Top: Basel, den 29. M\u00e4rz 1926.\\n - Then \\\"T\\\" (possibly a typo or formatting mark)\\n - Then \\\"Herrn Dr.W.Krasting,\\\" - this is the recipient\\n - Then the organization name\\n - Then \\\"Basel\\\" centered\\n - Then the text\\n\\n So the sender is not explicitly identified by name in the visible text. However, the letter is written on behalf of the \\\"Internationale Ausstellung f\u00fcr Binnenschiffahrt und Wasserkraftnutzung Basel 1926\\\" (International Exhibition for Inland Navigation and Hydropower Utilization Basel 1926).\\n\\n But the task asks for \\\"sender_persons\\\" - name(s) of the person(s) who wrote the letter. Since no specific person is named as the sender (only the organization is mentioned, and there's no signature), I should probably set this to null or try to infer if possible.\\n\\n Actually, looking at the text again, it says \\\"Ich best\u00e4tige Ihnen...\\\" (I confirm to you...), so there is a first-person singular writer, but their name isn't given.\\n\\n For the letter_title: There is no explicit title on the letter. The text is a confirmation of receipt and mention of discussions. I should set this to null.\\n\\n For send_date: \\\"Basel, den 29. M\u00e4rz 1926.\\\" - This is March 29, 1926. In ISO format: 1926-03-29.\\n\\n For receiver_persons: \\\"Herrn Dr.W.Krasting,\\\" - This is Dr. W. Krasting (or Herr Dr. W. Krasting).\\n\\n For sender_persons: Not explicitly stated. The letter is from Basel, presumably from the organization mentioned, but no individual name is given. I should set this to null.\\n\\n Wait, is there any indication of who wrote it? The text mentions \\\"unserer Vorstandsmitglieder\\\" (our board members), suggesting the writer is part of the board or organization, but no name is given.\\n\\n So:\\n - letter_title: null (no title visible)\\n - sender_persons: null (no sender name visible)\\n - send_date: [\\\"1926-03-29\\\"]\\n - receiver_persons: [\\\"Dr.W.Krasting\\\"] or [\\\"Herrn Dr.W.Krasting\\\"] - I should probably use \\\"Dr.W.Krasting\\\" or \\\"Dr. W. Krasting\\\"\\n\\n Actually, looking at the format, it says \\\"Herrn Dr.W.Krasting,\\\" - so the full designation is Herr Dr. W. Krasting. I should probably include \\\"Dr.W.Krasting\\\" or \\\"Dr. W. Krasting\\\".\\n\\n Let me reconsider the sender. Is it possible that the letter is from the organization itself, and the sender is the organization? But the key asks for \\\"sender_persons\\\" (plural persons), implying individuals. Since no individual is named, null is appropriate.\\n\\n Also, is there a title? The text doesn't have a title like \\\"Betreff: ...\\\" or anything. It just starts with the confirmation.\\n\\n So my JSON should be:\\n {\\n   \\\"letter_title\\\": [null],\\n   \\\"sender_persons\\\": [null],\\n   \\\"send_date\\\": [\\\"1926-03-29\\\"],\\n   \\\"receiver_persons\\\": [\\\"Dr.W.Krasting\\\"]\\n }\\n\\n Or should I include \\\"Herrn\\\" in the receiver name? The example shows \\\"Mayor Joe Quimby\\\" without titles, but \\\"Dr.\\\" is a professional title. I think \\\"Dr.W.Krasting\\\" or \\\"Dr. W. Krasting\\\" is appropriate. The text shows \\\"Dr.W.Krasting\\\" without a space, but I could normalize it to \\\"Dr. W. Krasting\\\" or keep it as \\\"Dr.W.Krasting\\\". I'll use \\\"Dr.W.Krasting\\\" as it appears, or maybe \\\"Dr. W. Krasting\\\" for readability. Actually, looking at the image, it looks like \\\"Dr.W.Krasting\\\" with no space after the period.\\n\\n Wait, I should check if there's any other interpretation. Could \\\"T\\\" be the sender's initial? Unlikely, it's probably just a formatting artifact or the beginning of the text.\\n\\n Could the sender be implied to be the organization? The text mentions \\\"unserer Vorstandsmitglieder\\\" suggesting the writer represents the organization. But without a name, I cannot fill in sender_persons.\\n\\n One more check: Is there any signature at the bottom? The image shows \\\"Hochachtungsvoll\\\" and then blank space. No signature.\\n\\n So final answer:\\n - letter_title: null\\n - sender_persons: null\\n - send_date: 1926-03-29\\n - receiver_persons: Dr.W.Krasting (or Herr Dr.W.Krasting)\\n\\n I'll provide the receiver as \\\"Dr.W.Krasting\\\" to match the text closely, or perhaps \\\"Herr Dr.W.Krasting\\\". The example includes titles like \\\"Mayor\\\", so including \\\"Dr.\\\" is appropriate. \\\"Herrn\\\" is just the German accusative case for \\\"Herr\\\" (Mr.), so the person is Dr. W. Krasting.\\n\\n Actually, looking at the text \\\"Herrn Dr.W.Krasting,\\\" - this is the salutation line. The person is Dr. W. Krasting.\\n\\n I'll format the date as 1926-03-29.\\n\\n The JSON structure requires lists for all values, even if single.\\n\\n So:\\n {\\n   \\\"letter_title\\\": [null],\\n   \\\"sender_persons\\\": [null],\\n   \\\"send_date\\\": [\\\"1926-03-29\\\"],\\n   \\\"receiver_persons\\\": [\\\"Dr.W.Krasting\\\"]\\n }\\n\\n Or should I write \\\"Dr. W. Krasting\\\"? The image shows \\\"Dr.W.Krasting\\\" without spaces. I'll use \\\"Dr.W.Krasting\\\" to be faithful to the text, or maybe \\\"Dr. W. Krasting\\\" is better. Actually, looking closely at the image, there might be a space after \\\"Dr.\\\" but it's hard to tell. It looks like \\\"Dr.W.Krasting\\\". I'll use \\\"Dr.W.Krasting\\\".\\n\\n Wait, I should check if the letter has a title. Sometimes the organization name serves as a title, but usually, a letter title is specific. The text doesn't have one.\\n\\n Final check:\\n - Date: 29. M\u00e4rz 1926 = 1926-03-29\\n - Receiver: Dr.W.Krasting\\n - Sender: Not specified (null)\\n - Title: Not specified (null)\\n\\n The JSON should be valid.\",\"reasoning_details\":[{\"type\":\"reasoning.text\",\"text\":\"The user wants me to extract specific information from a historical letter image and return it as JSON. Let me analyze the image carefully.\\n\\n First, let's look at the content:\\n - Date: \\\"Basel, den 29. M\u00e4rz 1926.\\\" - This is the date of the letter: March 29, 1926\\n - Recipient: \\\"Herrn Dr.W.Krasting,\\\" - This is the receiver\\n - Organization mentioned: \\\"Internationale Ausstellung f\u00fcr Binnenschiffahrt und Wasserkraftnutzung Basel 1926\\\" - This appears to be the organization/event, not the sender\\n - Place: \\\"Basel\\\" (centered)\\n - Body text: Confirms receipt of a letter from March 26, mentions discussions among board members about an operating community, and mentions they will soon make a proposal.\\n - Closing: \\\"Hochachtungsvoll\\\" (Yours faithfully/respectfully)\\n - No signature visible at the bottom, but the letter is from Basel\\n\\n Wait, I need to identify the sender. The letter is written from Basel, but who is the sender? The letterhead doesn't clearly show a sender name at the top. It just says \\\"Basel, den 29. M\u00e4rz 1926.\\\" and then \\\"T\\\" (possibly indicating the start of the text).\\n\\n Looking at the recipient: \\\"Herrn Dr.W.Krasting,\\\" - so Dr. W. Krasting is the receiver.\\n\\n The sender is not explicitly named in the visible portion. The letter is from Basel, and mentions \\\"unserer Vorstandsmitglieder\\\" (our board members), suggesting it's from an organization, but the specific sender name isn't visible in the image.\\n\\n Actually, looking more carefully at the text:\\n - \\\"Ich best\u00e4tige Ihnen dankend den Erhalt Ihres Schreibens vom 26. dies...\\\" - \\\"I confirm receipt of your letter of the 26th...\\\"\\n - The sender is writing to Dr. W. Krasting\\n - The sender mentions \\\"unserer Vorstandsmitglieder\\\" (our board members)\\n - The organization mentioned is \\\"Internationale Ausstellung f\u00fcr Binnenschiffahrt und Wasserkraftnutzung Basel 1926\\\"\\n\\n But who is the specific sender? The letter doesn't have a signature visible, and the sender's name isn't explicitly stated in the header. The header only shows the date and location.\\n\\n Wait, looking at the layout:\\n - Top: Basel, den 29. M\u00e4rz 1926.\\n - Then \\\"T\\\" (possibly a typo or formatting mark)\\n - Then \\\"Herrn Dr.W.Krasting,\\\" - this is the recipient\\n - Then the organization name\\n - Then \\\"Basel\\\" centered\\n - Then the text\\n\\n So the sender is not explicitly identified by name in the visible text. However, the letter is written on behalf of the \\\"Internationale Ausstellung f\u00fcr Binnenschiffahrt und Wasserkraftnutzung Basel 1926\\\" (International Exhibition for Inland Navigation and Hydropower Utilization Basel 1926).\\n\\n But the task asks for \\\"sender_persons\\\" - name(s) of the person(s) who wrote the letter. Since no specific person is named as the sender (only the organization is mentioned, and there's no signature), I should probably set this to null or try to infer if possible.\\n\\n Actually, looking at the text again, it says \\\"Ich best\u00e4tige Ihnen...\\\" (I confirm to you...), so there is a first-person singular writer, but their name isn't given.\\n\\n For the letter_title: There is no explicit title on the letter. The text is a confirmation of receipt and mention of discussions. I should set this to null.\\n\\n For send_date: \\\"Basel, den 29. M\u00e4rz 1926.\\\" - This is March 29, 1926. In ISO format: 1926-03-29.\\n\\n For receiver_persons: \\\"Herrn Dr.W.Krasting,\\\" - This is Dr. W. Krasting (or Herr Dr. W. Krasting).\\n\\n For sender_persons: Not explicitly stated. The letter is from Basel, presumably from the organization mentioned, but no individual name is given. I should set this to null.\\n\\n Wait, is there any indication of who wrote it? The text mentions \\\"unserer Vorstandsmitglieder\\\" (our board members), suggesting the writer is part of the board or organization, but no name is given.\\n\\n So:\\n - letter_title: null (no title visible)\\n - sender_persons: null (no sender name visible)\\n - send_date: [\\\"1926-03-29\\\"]\\n - receiver_persons: [\\\"Dr.W.Krasting\\\"] or [\\\"Herrn Dr.W.Krasting\\\"] - I should probably use \\\"Dr.W.Krasting\\\" or \\\"Dr. W. Krasting\\\"\\n\\n Actually, looking at the format, it says \\\"Herrn Dr.W.Krasting,\\\" - so the full designation is Herr Dr. W. Krasting. I should probably include \\\"Dr.W.Krasting\\\" or \\\"Dr. W. Krasting\\\".\\n\\n Let me reconsider the sender. Is it possible that the letter is from the organization itself, and the sender is the organization? But the key asks for \\\"sender_persons\\\" (plural persons), implying individuals. Since no individual is named, null is appropriate.\\n\\n Also, is there a title? The text doesn't have a title like \\\"Betreff: ...\\\" or anything. It just starts with the confirmation.\\n\\n So my JSON should be:\\n {\\n   \\\"letter_title\\\": [null],\\n   \\\"sender_persons\\\": [null],\\n   \\\"send_date\\\": [\\\"1926-03-29\\\"],\\n   \\\"receiver_persons\\\": [\\\"Dr.W.Krasting\\\"]\\n }\\n\\n Or should I include \\\"Herrn\\\" in the receiver name? The example shows \\\"Mayor Joe Quimby\\\" without titles, but \\\"Dr.\\\" is a professional title. I think \\\"Dr.W.Krasting\\\" or \\\"Dr. W. Krasting\\\" is appropriate. The text shows \\\"Dr.W.Krasting\\\" without a space, but I could normalize it to \\\"Dr. W. Krasting\\\" or keep it as \\\"Dr.W.Krasting\\\". I'll use \\\"Dr.W.Krasting\\\" as it appears, or maybe \\\"Dr. W. Krasting\\\" for readability. Actually, looking at the image, it looks like \\\"Dr.W.Krasting\\\" with no space after the period.\\n\\n Wait, I should check if there's any other interpretation. Could \\\"T\\\" be the sender's initial? Unlikely, it's probably just a formatting artifact or the beginning of the text.\\n\\n Could the sender be implied to be the organization? The text mentions \\\"unserer Vorstandsmitglieder\\\" suggesting the writer represents the organization. But without a name, I cannot fill in sender_persons.\\n\\n One more check: Is there any signature at the bottom? The image shows \\\"Hochachtungsvoll\\\" and then blank space. No signature.\\n\\n So final answer:\\n - letter_title: null\\n - sender_persons: null\\n - send_date: 1926-03-29\\n - receiver_persons: Dr.W.Krasting (or Herr Dr.W.Krasting)\\n\\n I'll provide the receiver as \\\"Dr.W.Krasting\\\" to match the text closely, or perhaps \\\"Herr Dr.W.Krasting\\\". The example includes titles like \\\"Mayor\\\", so including \\\"Dr.\\\" is appropriate. \\\"Herrn\\\" is just the German accusative case for \\\"Herr\\\" (Mr.), so the person is Dr. W. Krasting.\\n\\n Actually, looking at the text \\\"Herrn Dr.W.Krasting,\\\" - this is the salutation line. The person is Dr. W. Krasting.\\n\\n I'll format the date as 1926-03-29.\\n\\n The JSON structure requires lists for all values, even if single.\\n\\n So:\\n {\\n   \\\"letter_title\\\": [null],\\n   \\\"sender_persons\\\": [null],\\n   \\\"send_date\\\": [\\\"1926-03-29\\\"],\\n   \\\"receiver_persons\\\": [\\\"Dr.W.Krasting\\\"]\\n }\\n\\n Or should I write \\\"Dr. W. Krasting\\\"? The image shows \\\"Dr.W.Krasting\\\" without spaces. I'll use \\\"Dr.W.Krasting\\\" to be faithful to the text, or maybe \\\"Dr. W. Krasting\\\" is better. Actually, looking closely at the image, there might be a space after \\\"Dr.\\\" but it's hard to tell. It looks like \\\"Dr.W.Krasting\\\". I'll use \\\"Dr.W.Krasting\\\".\\n\\n Wait, I should check if the letter has a title. Sometimes the organization name serves as a title, but usually, a letter title is specific. The text doesn't have one.\\n\\n Final check:\\n - Date: 29. M\u00e4rz 1926 = 1926-03-29\\n - Receiver: Dr.W.Krasting\\n - Sender: Not specified (null)\\n - Title: Not specified (null)\\n\\n The JSON should be valid.\",\"format\":\"unknown\",\"index\":0}]},\"native_finish_reason\":\"stop\"}],\"created\":1780658052,\"model\":\"stepfun/step-3.7-flash-20260528\",\"object\":\"chat.completion\",\"service_tier\":null,\"system_fingerprint\":null,\"usage\":{\"completion_tokens\":1955,\"prompt_tokens\":1503,\"total_tokens\":3458,\"completion_tokens_details\":{\"accepted_prediction_tokens\":null,\"audio_tokens\":0,\"reasoning_tokens\":0,\"rejected_prediction_tokens\":null,\"image_tokens\":0},\"prompt_tokens_details\":{\"audio_tokens\":0,\"cached_tokens\":0,\"cache_write_tokens\":0,\"video_tokens\":0},\"cost\":0.00254885,\"is_byok\":false,\"cost_details\":{\"upstream_inference_cost\":0.00254885,\"upstream_inference_prompt_cost\":0.0003006,\"upstream_inference_completions_cost\":0.00224825}},\"provider\":\"StepFun\"}"}, "scoring": {"f1_macro": 0.55, "f1_micro": 0.69, "cost_summary": {"total_input_tokens": 49275, "total_output_tokens": 63972, "total_tokens": 113247, "input_cost_usd": 0.009854999999999997, "output_cost_usd": 0.07356779999999999, "total_cost_usd": 0.08342279999999999}}, "pricing": {"bucket_date": "2026-06-05", "age_days": 0, "input_price_per_million": 0.2, "output_price_per_million": 1.15}, "timing": {"total_response_s": 3673.59, "mean_response_s": 146.94, "slowest_response_s": 245.57, "inputs_timed": 25, "inputs_stored": 25, "span_s": 163.26}, "normalized_score": 55.00000000000001}