{"_id": {"$oid": "6ac4c7b5164e0f17c0b2357f"}, "test_id": "T1722", "benchmark": "business_letters", "date": "2026-09-08", "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/qwen3.8-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\":null,\"sender_persons\":null,\"receiver_persons\":[\"Dr. W. Krasting\"]}}", "model": "qwen/qwen3.8-flash", "provider": "openrouter", "finish_reason": "stop", "usage": {"input_tokens": 3165, "output_tokens": 871, "total_tokens": 4036, "cached_tokens": 512, "input_cost_usd": 0.00047474999999999997, "output_cost_usd": 0.00040937, "estimated_cost_usd": 0.00088412}, "duration": 24.96217942237854, "timestamp": "2026-09-08T09:56:26.835269", "parsed": {"metadata": {"send_date": ["1926-03-29"], "letter_title": null, "sender_persons": null, "receiver_persons": ["Dr. W. Krasting"], "document_number": "letter05"}}, "conversation_id": "49bce121-d80e-49c2-811b-fcc366c4ad5d", "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": 1, "receiver_persons_fp": 0, "receiver_persons_fn": 0}, "raw_response": "{\"id\":\"gen-1788854166-gdDIdjDSVDvsoKPuKfSP\",\"choices\":[{\"finish_reason\":\"stop\",\"index\":0,\"logprobs\":null,\"message\":{\"content\":\"{\\n  \\\"metadata\\\": {\\n    \\\"send_date\\\": [\\n      \\\"1926-03-29\\\"\\n    ],\\n    \\\"letter_title\\\": null,\\n    \\\"sender_persons\\\": null,\\n    \\\"receiver_persons\\\": [\\n      \\\"Dr. W. Krasting\\\"\\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\":[\"Dr. W. Krasting\"]}},\"reasoning\":\"We need answer user's request. Need produce JSON only, adhere schema. Need analyze image letter. User asks extract letter_title, sender_persons, send_date, receiver_persons. Need output JSON file? They say do not return anything except JSON file. Schema: {\\\"metadata\\\": {\\\"send_date\\\": array or null, \\\"letter_title\\\": array or null, \\\"sender_persons\\\": array or null, \\\"receiver_persons\\\": array or null}}? Actually schema has Document with metadata ref Metadata, required metadata. So final JSON must have top-level \\\"metadata\\\" object with keys. Need not include additional. Need determine values.\\n\\nImage: Basel, den 29. M\u00e4rz 1926. To Herrn Dr. W. Krasting, Internationale Ausstellung f\u00fcr Binnenschiffahrt und Wasserkraftnutzung Basel 1926, Basel. Body: Ich best\u00e4tige Ihnen dankend den Erhalt Ihres Schreibens vom 26. dies und teile Ihnen mit, dass die Besprechungen mit verschiedenen unserer Vorstandsmitglieder wegen einer Betriebsgemeinschaft weiter gef\u00fchrt werden. Ich glaube, dass wir n\u00e4chstens mit einem Vorschlage werden an Sie herantreten k\u00f6nnen. Hochachtungsvoll. No signature name? Sender not named? It says \\\"unserer Vorstandsmitglieder\\\" likely from some organization? But no sender person name. Could be letter from someone unnamed. Need sender_persons null if not included. Letter title? There is no title; maybe receiver line? Could be \\\"Internationale Ausstellung f\u00fcr Binnenschiffahrt und Wasserkraftnutzung Basel 1926\\\"? But letter_title is title of letter; if absent set null. Need maybe title from content? Not. send_date 1926-03-29. Receiver persons: Dr. W. Krasting. Maybe include title? \\\"Herrn Dr. W. Krasting\\\"? Name(s) of person(s) received: Dr. W. Krasting. Could include organization? No, receiver person only. Sender persons: null. Need output JSON. Ensure arrays. For null? Schema anyOf array of string or null. For missing set value null. But required keys. Could set \\\"sender_persons\\\": null, \\\"letter_title\\\": null. Or empty arrays? Instructions: If info not included set corresponding key to \\\"null\\\". But example uses arrays. It says values stored as list even if single. If missing set value \\\"null\\\". In JSON, null not list. Schema allows null. So use null for missing. Need maybe letter_title could be \\\"Internationale Ausstellung f\u00fcr Binnenschiffahrt und Wasserkraftnutzung Basel 1926\\\"? That's recipient's organization, not title. No title. So null.\\n\\nNeed consider if sender person could be inferred from \\\"Hochachtungsvoll\\\" no signature. null.\\n\\nNeed final only JSON. Ensure valid. Could use Unicode. Need maybe date ISO. 1926-03-29.\\n\\nDouble-check schema: [{\\\"$defs\\\": {\\\"Metadata\\\": {...}}, \\\"properties\\\": {\\\"metadata\\\": {\\\"$ref\\\": \\\"#/$defs/Metadata\\\"}}, \\\"required\\\": [\\\"metadata\\\"], ...}] So final object must have metadata. Additional false. So:\\n{\\n \\\"metadata\\\": {\\n  \\\"send_date\\\": [\\\"1926-03-29\\\"],\\n  \\\"letter_title\\\": null,\\n  \\\"sender_persons\\\": null,\\n  \\\"receiver_persons\\\": [\\\"Dr. W. Krasting\\\"]\\n }\\n}\\n\\nCould receiver include \\\"Herrn Dr. W. Krasting\\\"? Name(s) of person, likely Dr. W. Krasting. Maybe \\\"W. Krasting\\\"? The letter says Herrn Dr.W.Krasting. Include Dr. W. Krasting. Good.\\n\\nNeed no markdown. Final JSON only. Ensure no trailing commas.\",\"reasoning_details\":[{\"type\":\"reasoning.text\",\"text\":\"We need answer user's request. Need produce JSON only, adhere schema. Need analyze image letter. User asks extract letter_title, sender_persons, send_date, receiver_persons. Need output JSON file? They say do not return anything except JSON file. Schema: {\\\"metadata\\\": {\\\"send_date\\\": array or null, \\\"letter_title\\\": array or null, \\\"sender_persons\\\": array or null, \\\"receiver_persons\\\": array or null}}? Actually schema has Document with metadata ref Metadata, required metadata. So final JSON must have top-level \\\"metadata\\\" object with keys. Need not include additional. Need determine values.\\n\\nImage: Basel, den 29. M\u00e4rz 1926. To Herrn Dr. W. Krasting, Internationale Ausstellung f\u00fcr Binnenschiffahrt und Wasserkraftnutzung Basel 1926, Basel. Body: Ich best\u00e4tige Ihnen dankend den Erhalt Ihres Schreibens vom 26. dies und teile Ihnen mit, dass die Besprechungen mit verschiedenen unserer Vorstandsmitglieder wegen einer Betriebsgemeinschaft weiter gef\u00fchrt werden. Ich glaube, dass wir n\u00e4chstens mit einem Vorschlage werden an Sie herantreten k\u00f6nnen. Hochachtungsvoll. No signature name? Sender not named? It says \\\"unserer Vorstandsmitglieder\\\" likely from some organization? But no sender person name. Could be letter from someone unnamed. Need sender_persons null if not included. Letter title? There is no title; maybe receiver line? Could be \\\"Internationale Ausstellung f\u00fcr Binnenschiffahrt und Wasserkraftnutzung Basel 1926\\\"? But letter_title is title of letter; if absent set null. Need maybe title from content? Not. send_date 1926-03-29. Receiver persons: Dr. W. Krasting. Maybe include title? \\\"Herrn Dr. W. Krasting\\\"? Name(s) of person(s) received: Dr. W. Krasting. Could include organization? No, receiver person only. Sender persons: null. Need output JSON. Ensure arrays. For null? Schema anyOf array of string or null. For missing set value null. But required keys. Could set \\\"sender_persons\\\": null, \\\"letter_title\\\": null. Or empty arrays? Instructions: If info not included set corresponding key to \\\"null\\\". But example uses arrays. It says values stored as list even if single. If missing set value \\\"null\\\". In JSON, null not list. Schema allows null. So use null for missing. Need maybe letter_title could be \\\"Internationale Ausstellung f\u00fcr Binnenschiffahrt und Wasserkraftnutzung Basel 1926\\\"? That's recipient's organization, not title. No title. So null.\\n\\nNeed consider if sender person could be inferred from \\\"Hochachtungsvoll\\\" no signature. null.\\n\\nNeed final only JSON. Ensure valid. Could use Unicode. Need maybe date ISO. 1926-03-29.\\n\\nDouble-check schema: [{\\\"$defs\\\": {\\\"Metadata\\\": {...}}, \\\"properties\\\": {\\\"metadata\\\": {\\\"$ref\\\": \\\"#/$defs/Metadata\\\"}}, \\\"required\\\": [\\\"metadata\\\"], ...}] So final object must have metadata. Additional false. So:\\n{\\n \\\"metadata\\\": {\\n  \\\"send_date\\\": [\\\"1926-03-29\\\"],\\n  \\\"letter_title\\\": null,\\n  \\\"sender_persons\\\": null,\\n  \\\"receiver_persons\\\": [\\\"Dr. W. Krasting\\\"]\\n }\\n}\\n\\nCould receiver include \\\"Herrn Dr. W. Krasting\\\"? Name(s) of person, likely Dr. W. Krasting. Maybe \\\"W. Krasting\\\"? The letter says Herrn Dr.W.Krasting. Include Dr. W. Krasting. Good.\\n\\nNeed no markdown. Final JSON only. Ensure no trailing commas.\",\"format\":\"unknown\",\"index\":0}]},\"native_finish_reason\":\"stop\"}],\"created\":1788854166,\"model\":\"qwen/qwen3.8-flash\",\"object\":\"chat.completion\",\"service_tier\":null,\"system_fingerprint\":null,\"usage\":{\"completion_tokens\":871,\"prompt_tokens\":3165,\"total_tokens\":4036,\"completion_tokens_details\":{\"accepted_prediction_tokens\":null,\"audio_tokens\":0,\"reasoning_tokens\":793,\"rejected_prediction_tokens\":null,\"image_tokens\":0},\"prompt_tokens_details\":{\"audio_tokens\":0,\"cached_tokens\":512,\"cache_write_tokens\":0,\"video_tokens\":0},\"cost\":0.000815512,\"is_byok\":false,\"cost_details\":{\"upstream_inference_cost\":0.000815512,\"upstream_inference_prompt_cost\":0.000406142,\"upstream_inference_completions_cost\":0.00040937}},\"provider\":\"Alibaba\"}"}, "scoring": {"f1_macro": 0.5, "f1_micro": 0.57, "cost_summary": {"total_input_tokens": 98743, "total_output_tokens": 46737, "total_tokens": 145480, "input_cost_usd": 0.014159674, "output_cost_usd": 0.02196639, "total_cost_usd": 0.036126064}}, "pricing": {"bucket_date": "2026-09-08", "age_days": 0, "input_price_per_million": 0.15, "output_price_per_million": 0.47}, "timing": {"total_response_s": 2536.93, "mean_response_s": 101.48, "slowest_response_s": 437.57, "inputs_timed": 25, "inputs_stored": 25, "span_s": 423.0}, "normalized_score": 50.0}