{"_id": {"$oid": "6a26c67c3572c06bc1455d8b"}, "test_id": "T0985", "benchmark": "business_letters", "date": "2026-04-21", "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": "qwen/qwen3.5-9b", "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\":[\"null\"],\"sender_persons\":[\"null\"],\"receiver_persons\":[\"Basler Rheinschifffahrt-Aktiengesellschaft\"]}}", "model": "qwen/qwen3.5-9b-20260310", "provider": "openrouter", "finish_reason": "stop", "usage": {"input_tokens": 3225, "output_tokens": 1764, "total_tokens": 4989, "input_cost_usd": 0.00032250000000000003, "output_cost_usd": 0.0002646, "estimated_cost_usd": 0.0005871}, "duration": 59.64431357383728, "timestamp": "2026-04-21T15:10:03.190715", "parsed": {"metadata": {"send_date": ["1926-03-29"], "letter_title": ["null"], "sender_persons": ["null"], "receiver_persons": ["Basler Rheinschifffahrt-Aktiengesellschaft"], "document_number": "letter06"}}, "conversation_id": "9f2b53ea-efa0-4cf7-9557-f0b552b19beb", "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": 0}, "raw_response": "{\"id\":\"gen-1776776944-7DdovhpCydQu92Dv3iWf\",\"choices\":[{\"finish_reason\":\"stop\",\"index\":0,\"logprobs\":null,\"message\":{\"content\":\"{\\n    \\\"metadata\\\": {\\n        \\\"send_date\\\": [\\n            \\\"1926-03-29\\\"\\n        ],\\n        \\\"letter_title\\\": [\\n            \\\"null\\\"\\n        ],\\n        \\\"sender_persons\\\": [\\n            \\\"null\\\"\\n        ],\\n        \\\"receiver_persons\\\": [\\n            \\\"Basler Rheinschifffahrt-Aktiengesellschaft\\\"\\n        ]\\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\":[\"null\"],\"sender_persons\":[\"null\"],\"receiver_persons\":[\"Basler Rheinschifffahrt-Aktiengesellschaft\"]}},\"reasoning\":\"The user wants me to extract specific information from a historical letter and format it as JSON.\\n\\n**1. Analyze the Request:**\\n*   **Role:** Historian with keyword knowledge and expert in 20th-century Swiss history.\\n*   **Task:** Extract `letter_title`, `sender_persons`, `send_date`, `receiver_persons`.\\n*   **Format:** JSON.\\n*   **Constraints:**\\n    *   Values must be lists.\\n    *   Dates in ISO format (YYYY-MM-DD).\\n    *   \\\"null\\\" if not found.\\n    *   No extra text, just JSON.\\n\\n**2. Analyze the Image:**\\n*   **Header:** \\\"Basel, den 29. M\u00e4rz 1926.\\\" -> This is the date and location.\\n*   **Recipient Address Block:**\\n    *   \\\"Basler Rheinschifffahrt-Aktiengesellschaft\\\" (Basle Rhine Shipping Joint Stock Company)\\n    *   \\\"Marktgasse 5, III\\\"\\n    *   \\\"Basel.\\\"\\n*   **Body Text:**\\n    *   \\\"Zur\u00fcckkommend auf Ihre beiden Schreiben vom 16. Februar und 4. M\u00e4rz...\\\" (Referring to previous letters).\\n    *   \\\"...best\u00e4tige ich Ihnen den Empfang Ihrer Zeilen vom 24. crt., womit Sie mir Copie Ihres Briefes an die Internationale Ausstellung f\u00fcr Binnenschifffahrt und Wasserkraftnutzung Basel 1926 \u00fcbermachen.\\\" (Confirming receipt of a letter dated 24th, regarding a copy of a letter to the International Exhibition for Inland Navigation and Water Power Utilization Basel 1926).\\n    *   \\\"Ich teile Ihnen mit, dass ich meine Bem\u00fchungen f\u00fcr den Abschluss einer Betriebsgemeinschaft fortsetze...\\\" (I inform you that I am continuing my efforts to conclude a business community...).\\n    *   \\\"Immerhin muss ich Ihnen doch jetzt schon sagen, dass die Widerst\u00e4nde gr\u00f6\u00dfer zu sein scheinen, als ich glaubte.\\\" (However, I must now tell you that the resistance seems greater than I thought).\\n    *   \\\"Hochachtungsvoll\\\" (Sincerely/Respectfully).\\n\\n**3. Extract Information:**\\n\\n*   **letter_title:** There is no explicit title like \\\"Letter regarding X\\\". It's a standard business letter. However, the content mentions \\\"Internationale Ausstellung f\u00fcr Binnenschifffahrt und Wasserkraftnutzung Basel 1926\\\". This isn't a title of the letter itself, but the subject matter. The prompt asks for \\\"Title of the letter\\\". Usually, if there isn't a subject line, it's null or inferred. Let's look closer. Is there a subject line? No. Is there a title? No. I will set this to null or perhaps infer a subject based on the content if appropriate, but strictly speaking, there is no title. Wait, looking at the very top left, there is a \\\"T\\\". This might be a file reference or initial. Let's stick to null for title as there is no explicit title.\\n*   **sender_persons:** The letter is signed \\\"Hochachtungsvoll\\\" at the bottom. The name of the sender is *not* visible in the provided image. The image cuts off before the signature block. Therefore, the sender is unknown based *only* on this image. I must set this to \\\"null\\\".\\n*   **send_date:** \\\"Basel, den 29. M\u00e4rz 1926.\\\" -> 1926-03-29.\\n*   **receiver_persons:** The address block is clearly for \\\"Basler Rheinschifffahrt-Aktiengesellschaft\\\". This is a company, not a specific person, but in the context of \\\"receiver_persons\\\", a company name is the entity receiving the letter.\\n\\n**4. Refine Extraction:**\\n\\n*   **letter_title:** The text mentions \\\"Internationale Ausstellung f\u00fcr Binnenschifffahrt und Wasserkraftnutzung Basel 1926\\\". This is the event being discussed. Is it the title? No. Is there a title? No. I will set to null.\\n*   **sender_persons:** Not visible. \\\"null\\\".\\n*   **send_date:** 1926-03-29.\\n*   **receiver_persons:** \\\"Basler Rheinschifffahrt-Aktiengesellschaft\\\".\\n\\n**5. Final Check:**\\n*   Did I miss the sender? The text starts with \\\"Zur\u00fcckkommend auf Ihre beiden Schreiben...\\\". No signature at the bottom.\\n*   Did I miss the title? No subject line.\\n*   Date format: 1926-03-29.\\n*   Receiver: Basler Rheinschifffahrt-Aktiengesellschaft.\\n\\nLet's re-read the prompt requirements. \\\"If a piece of information is not included in the letter, set the value for the corresponding key to 'null'\\\".\\n\\nSo:\\n*   letter_title: null\\n*   sender_persons: null\\n*   send_date: [\\\"1926-03-29\\\"]\\n*   receiver_persons: [\\\"Basler Rheinschifffahrt-Aktiengesellschaft\\\"]\\n\\nWait, looking really closely at the top left, there is a \\\"T\\\". Is that a title? Unlikely. It looks like a file marker.\\nLooking at the address block again.\\n\\\"Basler Rheinschifffahrt-Aktiengesellschaft\\\"\\n\\\"Marktgasse 5, III\\\"\\n\\\"Basel.\\\"\\n\\nThe prompt asks for \\\"sender_persons\\\". Since the signature is missing, I cannot identify the person.\\nThe prompt asks for \\\"receiver_persons\\\". The company is the receiver.\\n\\nLet's double check if I can infer the sender. The text mentions \\\"Internationale Ausstellung f\u00fcr Binnenschifffahrt und Wasserkraftnutzung Basel 1926\\\". This is a specific historical event. The person writing is likely involved in it. But without a name, I can't guess.\\n\\nSo the JSON will be:\\n```json\\n{\\n    \\\"letter_title\\\": null,\\n    \\\"sender_persons\\\": null,\\n    \\\"send_date\\\": [\\\"1926-03-29\\\"],\\n    \\\"receiver_persons\\\": [\\\"Basler Rheinschifffahrt-Aktiengesellschaft\\\"]\\n}\\n```\\n\\nWait, is \\\"Basler Rheinschifffahrt-Aktiengesellschaft\\\" a person? No, it's a company. But the key is \\\"receiver_persons\\\". In historical document extraction, usually, the addressee is listed. If it's a company, it goes there.\\n\\nLet's look at the \\\"letter_title\\\" again. Sometimes the first line is a title. \\\"Basel, den 29. M\u00e4rz 1926.\\\" is the date.\\nThe text \\\"Basler Rheinschifffahrt-Aktiengesellschaft\\\" is the addressee.\\nThere is no title.\\n\\nOne detail: \\\"24. crt.\\\" -> 24. current month (M\u00e4rz). So March 24th.\\n\\\"16. Februar\\\" -> Feb 16.\\n\\\"4. M\u00e4rz\\\" -> March 4.\\n\\nOkay, I'm confident.\\n\\nOne final check on the sender. Is it possible the \\\"T\\\" at the top left is an initial? It's isolated. It's likely a file reference.\\nIs it possible the sender is implied? \\\"Ich teile Ihnen mit...\\\" (I inform you). No name.\\n\\nSo, sender is null.\\n\\nReceiver: \\\"Basler Rheinschifffahrt-Aktiengesellschaft\\\".\\n\\nDate: 1926-03-29.\\n\\nTitle: null.\\n\\nLet's construct the JSON.\\n\",\"reasoning_details\":[{\"type\":\"reasoning.text\",\"text\":\"The user wants me to extract specific information from a historical letter and format it as JSON.\\n\\n**1. Analyze the Request:**\\n*   **Role:** Historian with keyword knowledge and expert in 20th-century Swiss history.\\n*   **Task:** Extract `letter_title`, `sender_persons`, `send_date`, `receiver_persons`.\\n*   **Format:** JSON.\\n*   **Constraints:**\\n    *   Values must be lists.\\n    *   Dates in ISO format (YYYY-MM-DD).\\n    *   \\\"null\\\" if not found.\\n    *   No extra text, just JSON.\\n\\n**2. Analyze the Image:**\\n*   **Header:** \\\"Basel, den 29. M\u00e4rz 1926.\\\" -> This is the date and location.\\n*   **Recipient Address Block:**\\n    *   \\\"Basler Rheinschifffahrt-Aktiengesellschaft\\\" (Basle Rhine Shipping Joint Stock Company)\\n    *   \\\"Marktgasse 5, III\\\"\\n    *   \\\"Basel.\\\"\\n*   **Body Text:**\\n    *   \\\"Zur\u00fcckkommend auf Ihre beiden Schreiben vom 16. Februar und 4. M\u00e4rz...\\\" (Referring to previous letters).\\n    *   \\\"...best\u00e4tige ich Ihnen den Empfang Ihrer Zeilen vom 24. crt., womit Sie mir Copie Ihres Briefes an die Internationale Ausstellung f\u00fcr Binnenschifffahrt und Wasserkraftnutzung Basel 1926 \u00fcbermachen.\\\" (Confirming receipt of a letter dated 24th, regarding a copy of a letter to the International Exhibition for Inland Navigation and Water Power Utilization Basel 1926).\\n    *   \\\"Ich teile Ihnen mit, dass ich meine Bem\u00fchungen f\u00fcr den Abschluss einer Betriebsgemeinschaft fortsetze...\\\" (I inform you that I am continuing my efforts to conclude a business community...).\\n    *   \\\"Immerhin muss ich Ihnen doch jetzt schon sagen, dass die Widerst\u00e4nde gr\u00f6\u00dfer zu sein scheinen, als ich glaubte.\\\" (However, I must now tell you that the resistance seems greater than I thought).\\n    *   \\\"Hochachtungsvoll\\\" (Sincerely/Respectfully).\\n\\n**3. Extract Information:**\\n\\n*   **letter_title:** There is no explicit title like \\\"Letter regarding X\\\". It's a standard business letter. However, the content mentions \\\"Internationale Ausstellung f\u00fcr Binnenschifffahrt und Wasserkraftnutzung Basel 1926\\\". This isn't a title of the letter itself, but the subject matter. The prompt asks for \\\"Title of the letter\\\". Usually, if there isn't a subject line, it's null or inferred. Let's look closer. Is there a subject line? No. Is there a title? No. I will set this to null or perhaps infer a subject based on the content if appropriate, but strictly speaking, there is no title. Wait, looking at the very top left, there is a \\\"T\\\". This might be a file reference or initial. Let's stick to null for title as there is no explicit title.\\n*   **sender_persons:** The letter is signed \\\"Hochachtungsvoll\\\" at the bottom. The name of the sender is *not* visible in the provided image. The image cuts off before the signature block. Therefore, the sender is unknown based *only* on this image. I must set this to \\\"null\\\".\\n*   **send_date:** \\\"Basel, den 29. M\u00e4rz 1926.\\\" -> 1926-03-29.\\n*   **receiver_persons:** The address block is clearly for \\\"Basler Rheinschifffahrt-Aktiengesellschaft\\\". This is a company, not a specific person, but in the context of \\\"receiver_persons\\\", a company name is the entity receiving the letter.\\n\\n**4. Refine Extraction:**\\n\\n*   **letter_title:** The text mentions \\\"Internationale Ausstellung f\u00fcr Binnenschifffahrt und Wasserkraftnutzung Basel 1926\\\". This is the event being discussed. Is it the title? No. Is there a title? No. I will set to null.\\n*   **sender_persons:** Not visible. \\\"null\\\".\\n*   **send_date:** 1926-03-29.\\n*   **receiver_persons:** \\\"Basler Rheinschifffahrt-Aktiengesellschaft\\\".\\n\\n**5. Final Check:**\\n*   Did I miss the sender? The text starts with \\\"Zur\u00fcckkommend auf Ihre beiden Schreiben...\\\". No signature at the bottom.\\n*   Did I miss the title? No subject line.\\n*   Date format: 1926-03-29.\\n*   Receiver: Basler Rheinschifffahrt-Aktiengesellschaft.\\n\\nLet's re-read the prompt requirements. \\\"If a piece of information is not included in the letter, set the value for the corresponding key to 'null'\\\".\\n\\nSo:\\n*   letter_title: null\\n*   sender_persons: null\\n*   send_date: [\\\"1926-03-29\\\"]\\n*   receiver_persons: [\\\"Basler Rheinschifffahrt-Aktiengesellschaft\\\"]\\n\\nWait, looking really closely at the top left, there is a \\\"T\\\". Is that a title? Unlikely. It looks like a file marker.\\nLooking at the address block again.\\n\\\"Basler Rheinschifffahrt-Aktiengesellschaft\\\"\\n\\\"Marktgasse 5, III\\\"\\n\\\"Basel.\\\"\\n\\nThe prompt asks for \\\"sender_persons\\\". Since the signature is missing, I cannot identify the person.\\nThe prompt asks for \\\"receiver_persons\\\". The company is the receiver.\\n\\nLet's double check if I can infer the sender. The text mentions \\\"Internationale Ausstellung f\u00fcr Binnenschifffahrt und Wasserkraftnutzung Basel 1926\\\". This is a specific historical event. The person writing is likely involved in it. But without a name, I can't guess.\\n\\nSo the JSON will be:\\n```json\\n{\\n    \\\"letter_title\\\": null,\\n    \\\"sender_persons\\\": null,\\n    \\\"send_date\\\": [\\\"1926-03-29\\\"],\\n    \\\"receiver_persons\\\": [\\\"Basler Rheinschifffahrt-Aktiengesellschaft\\\"]\\n}\\n```\\n\\nWait, is \\\"Basler Rheinschifffahrt-Aktiengesellschaft\\\" a person? No, it's a company. But the key is \\\"receiver_persons\\\". In historical document extraction, usually, the addressee is listed. If it's a company, it goes there.\\n\\nLet's look at the \\\"letter_title\\\" again. Sometimes the first line is a title. \\\"Basel, den 29. M\u00e4rz 1926.\\\" is the date.\\nThe text \\\"Basler Rheinschifffahrt-Aktiengesellschaft\\\" is the addressee.\\nThere is no title.\\n\\nOne detail: \\\"24. crt.\\\" -> 24. current month (M\u00e4rz). So March 24th.\\n\\\"16. Februar\\\" -> Feb 16.\\n\\\"4. M\u00e4rz\\\" -> March 4.\\n\\nOkay, I'm confident.\\n\\nOne final check on the sender. Is it possible the \\\"T\\\" at the top left is an initial? It's isolated. It's likely a file reference.\\nIs it possible the sender is implied? \\\"Ich teile Ihnen mit...\\\" (I inform you). No name.\\n\\nSo, sender is null.\\n\\nReceiver: \\\"Basler Rheinschifffahrt-Aktiengesellschaft\\\".\\n\\nDate: 1926-03-29.\\n\\nTitle: null.\\n\\nLet's construct the JSON.\\n\",\"format\":\"unknown\",\"index\":0}]},\"native_finish_reason\":\"stop\"}],\"created\":1776776944,\"model\":\"qwen/qwen3.5-9b-20260310\",\"object\":\"chat.completion\",\"service_tier\":null,\"system_fingerprint\":null,\"usage\":{\"completion_tokens\":1764,\"prompt_tokens\":3225,\"total_tokens\":4989,\"completion_tokens_details\":{\"accepted_prediction_tokens\":null,\"audio_tokens\":0,\"reasoning_tokens\":1551,\"rejected_prediction_tokens\":null,\"image_tokens\":0},\"prompt_tokens_details\":{\"audio_tokens\":0,\"cached_tokens\":0,\"cache_write_tokens\":0,\"video_tokens\":0},\"cost\":0.0005871,\"is_byok\":false,\"cost_details\":{\"upstream_inference_cost\":0.0005871,\"upstream_inference_prompt_cost\":0.0003225,\"upstream_inference_completions_cost\":0.0002646}},\"provider\":\"Venice\"}"}, "scoring": {"f1_macro": 0.52, "f1_micro": 0.6, "cost_summary": {"total_input_tokens": 110896, "total_output_tokens": 77708, "total_tokens": 188604, "input_cost_usd": 0.0110896, "output_cost_usd": 0.011656199999999999, "total_cost_usd": 0.0227458}}, "normalized_score": 52.0}