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{"type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01D4LHkMDSUupcvPvsqT5SY5","type":"tool_result","content":[{"type":"text","text":"Script ran on page and returned:\n```json\n\"World population milestones in billions[62] (Worldometers estimates)\\nPopulation\\n(in billions)\\t1\\t2\\t3\\t4\\t5\\t6\\t7\\t8\\t9\\t10\\nYear\\t1804\\t1927\\t1960\\t1974\\t1987\\t1999\\t2011\\t2022\\t2037\\t2057\\nYears elapsed\\t—\\t123\\t33\\t14\\t13\\t12\\t12\\t11\\t15\\t 20 \\t—\\n\\n---\\n\\nStarting at 500 million\\nPopulation\\n(in billions)\\t0.5\\t1\\t2\\t4\\t8\\t16\\nYear\\t1500\\t1804\\t1927\\t1974\\t2022\\t—\\nYears elapsed\\t—\\t304\\t123\\t47\\t48\\t — \\t—\\n\\n---\\n\\nStarting at 375 million\\nPopulation\\n(in billions)\\t0.375\\t0.75\\t1.5\\t3\\t6\\t12\\nYear\\t1171\\t1715\\t1881\\t1960\\t1999\\tc. 2100[155]\\nYears elapsed\\t—\\t544\\t166\\t79\\t39\\tc. 100+\\t—\"\n```"}]}]},"parent_tool_use_id":null,"session_id":"e581f845-a202-4933-8811-d1ed434f3d6d","uuid":"74878459-8566-44b3-bd1f-99f80ef2bd40","timestamp":"2026-04-03T10:04:26.249Z","tool_use_result":[{"type":"text","text":"Script ran on page and returned:\n```json\n\"World population milestones in billions[62] (Worldometers estimates)\\nPopulation\\n(in billions)\\t1\\t2\\t3\\t4\\t5\\t6\\t7\\t8\\t9\\t10\\nYear\\t1804\\t1927\\t1960\\t1974\\t1987\\t1999\\t2011\\t2022\\t2037\\t2057\\nYears elapsed\\t—\\t123\\t33\\t14\\t13\\t12\\t12\\t11\\t15\\t 20 \\t—\\n\\n---\\n\\nStarting at 500 million\\nPopulation\\n(in billions)\\t0.5\\t1\\t2\\t4\\t8\\t16\\nYear\\t1500\\t1804\\t1927\\t1974\\t2022\\t—\\nYears elapsed\\t—\\t304\\t123\\t47\\t48\\t — \\t—\\n\\n---\\n\\nStarting at 375 million\\nPopulation\\n(in billions)\\t0.375\\t0.75\\t1.5\\t3\\t6\\t12\\nYear\\t1171\\t1715\\t1881\\t1960\\t1999\\tc. 2100[155]\\nYears elapsed\\t—\\t544\\t166\\t79\\t39\\tc. 100+\\t—\"\n```"}]}
{"type":"assistant","message":{"model":"claude-sonnet-4-6","id":"msg_014Cc89t87YDWckrRegwZLSf","type":"message","role":"assistant","content":[{"type":"text","text":"Here are the years when world population reached each billion milestone (per Worldometers estimates):\n\n| Population | Year |\n|------------|------|\n| 1 billion  | 1804 |\n| 2 billion  | 1927 |\n| 3 billion  | 1960 |\n| 4 billion  | 1974 |\n| 5 billion  | 1987 |\n| 6 billion  | 1999 |\n| 7 billion  | 2011 |\n| 8 billion  | 2022 |\n\nNotable pattern: it took 123 years to go from 1→2 billion, but recent billions have been added roughly every 11–14 years."}],"stop_reason":null,"stop_sequence":null,"stop_details":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":892,"cache_read_input_tokens":17747,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":892},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"},"context_management":null},"parent_tool_use_id":null,"session_id":"e581f845-a202-4933-8811-d1ed434f3d6d","uuid":"4443bb61-8d2c-4866-ad65-299272b05912"}
{"type":"result","subtype":"success","is_error":false,"duration_ms":22295,"duration_api_ms":20921,"num_turns":7,"result":"Here are the years when world population reached each billion milestone (per Worldometers estimates):\n\n| Population | Year |\n|------------|------|\n| 1 billion  | 1804 |\n| 2 billion  | 1927 |\n| 3 billion  | 1960 |\n| 4 billion  | 1974 |\n| 5 billion  | 1987 |\n| 6 billion  | 1999 |\n| 7 billion  | 2011 |\n| 8 billion  | 2022 |\n\nNotable pattern: it took 123 years to go from 1→2 billion, but recent billions have been added roughly every 11–14 years.","stop_reason":"end_turn","session_id":"e581f845-a202-4933-8811-d1ed434f3d6d","total_cost_usd":0.08809305,"usage":{"input_tokens":12,"cache_creation_input_tokens":10843,"cache_read_input_tokens":111936,"output_tokens":921,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":10843,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"},"modelUsage":{"claude-sonnet-4-6":{"inputTokens":12,"outputTokens":921,"cacheReadInputTokens":111936,"cacheCreationInputTokens":10843,"webSearchRequests":0,"costUSD":0.08809305,"contextWindow":200000,"maxOutputTokens":32000}},"permission_denials":[],"fast_mode_state":"off","uuid":"71ab2c78-18c1-4b2e-8b64-88666d21b29b"}
