{"schema_version":1,"id":"no-letter-e","slug":"no-letter-e","series":null,"title":"Can an AI write three lines without the letter e?","question_plain":"We asked each Claude model for three lines about a topic, with the rule that the letter e must not appear anywhere.","topics":["writing","constraints"],"copy":{"how_we_tested":"We gave {n_models} Claude models the same {n_prompts} topics, one try each, every one in a new chat. A script counts every letter e, including accented and look-alike versions.","limits":["This is a small test run over a few days. Small differences between models are not meaningful.","Every answer is kept. Nothing was removed because it looked odd.","Each topic was tried once per model.","Only Claude models were tested here.","Effort was each model's own default and was not set."],"headline_template":"Replies with no letter e at all, per model, out of {n_per_model}."},"facts":{"n_models":3,"n_answers":30,"n_prompts":10,"n_headline_answers":30,"n_per_model":10},"prompts":[{"id":"en-01-L3","variant":null,"text":"Write exactly three lines about the ocean. Do not use the letter \"e\" anywhere, neither lowercase nor uppercase. Output only the text.","system_prompt":"You are a helpful assistant."},{"id":"en-02-L3","variant":null,"text":"Write exactly three lines about a cat. Do not use the letter \"e\" anywhere, neither lowercase nor uppercase. Output only the text.","system_prompt":"You are a helpful assistant."},{"id":"en-03-L3","variant":null,"text":"Write exactly three lines about morning coffee. Do not use the letter \"e\" anywhere, neither lowercase nor uppercase. Output only the text.","system_prompt":"You are a helpful assistant."},{"id":"en-04-L3","variant":null,"text":"Write exactly three lines about a city at night. Do not use the letter \"e\" anywhere, neither lowercase nor uppercase. Output only the text.","system_prompt":"You are a helpful assistant."},{"id":"en-05-L3","variant":null,"text":"Write exactly three lines about rain. Do not use the letter \"e\" anywhere, neither lowercase nor uppercase. Output only the text.","system_prompt":"You are a helpful assistant."},{"id":"en-06-L3","variant":null,"text":"Write exactly three lines about a job interview. Do not use the letter \"e\" anywhere, neither lowercase nor uppercase. Output only the text.","system_prompt":"You are a helpful assistant."},{"id":"en-07-L3","variant":null,"text":"Write exactly three lines about a phone. Do not use the letter \"e\" anywhere, neither lowercase nor uppercase. Output only the text.","system_prompt":"You are a helpful assistant."},{"id":"en-08-L3","variant":null,"text":"Write exactly three lines about a birthday. Do not use the letter \"e\" anywhere, neither lowercase nor uppercase. Output only the text.","system_prompt":"You are a helpful assistant."},{"id":"en-09-L3","variant":null,"text":"Write exactly three lines about football. Do not use the letter \"e\" anywhere, neither lowercase nor uppercase. Output only the text.","system_prompt":"You are a helpful assistant."},{"id":"en-10-L3","variant":null,"text":"Write exactly three lines about the moon. Do not use the letter \"e\" anywhere, neither lowercase nor uppercase. Output only the text.","system_prompt":"You are a helpful assistant."}],"runs":[{"id":"main","role":"primary","route":"claude_code","window":{"start":"2026-10-07T17:22:37.695525+03:00","end":"2026-10-07T17:24:38.076292+03:00"},"tool":{"name":"Claude Code CLI (claude -p)","version":"2.1.287"},"source_files":[{"path":"effort-dial__effort_pack__raw__claude-fable-5-1.jsonl.gz","sha256":"160be35142b72aaa6193d13887e6ec4f1c1a96d4d5bd5cf28247536618d73b52","rows":10},{"path":"effort-dial__effort_pack__raw__claude-opus-5-5.jsonl.gz","sha256":"8727c54503fc7320a6c5e4a162d20acfcde8e2e5b20c0b9c1cc1412a12956e0c","rows":10},{"path":"effort-dial__effort_pack__raw__claude-sonnet-5-5.jsonl.gz","sha256":"a1bb9a33cbad9fbb08940c26b2ac3b4db63988d8b5d15bb35d826c6affcef628","rows":10}],"counted_in_totals":true,"label":null}],"models":[{"model_key":"claude-fable-5-1","name":"Claude Fable 5.1","lab":"Anthropic","model_id":"claude-fable-5-1","route":"claude_code","run_id":"main","settings":{"temperature":"CLI 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walls.","finish_reason":"end_turn","verdict":{"label":"zero-e","value":0,"flags":[],"recorded":{"pass_primary":true,"joint":true,"dict_rate":0.9714285714285714}},"in_headline":true,"ts_start":"2026-10-07T17:24:02.231106+03:00","ts_end":"2026-10-07T17:24:09.523925+03:00","tokens":{"input":483,"output":337,"cache_read":0,"cache_write":0,"reasoning":257},"latency_s":6.675,"source":{"file":"effort-dial__effort_pack__raw__claude-fable-5-1.jsonl.gz","line":4},"forbidden":[]},{"id":"no-letter-e:claude-fable-5-1|main|en-05-L3#t0#a0","model_key":"claude-fable-5-1","model_id":"claude-fable-5-1","model_name":"Claude Fable 5.1","lab":"Anthropic","route":"claude_code","served_by":"claude-fable-5-1","run_id":"main","phase":"main","prompt_id":"en-05-L3","run_index":0,"condition":{"length":"L3","topic_idx":5},"attempt":0,"ok":true,"text":"Rain falls softly on dark rooftops at night.\nDrops drum on tin, a calm and cooling song.\nClouds pass, and all is damp and still.","finish_reason":"end_turn","verdict":{"label":"zero-e","value":0,"flags":[],"recorded":{"pass_primary":true,"joint":true,"dict_rate":0.96}},"in_headline":true,"ts_start":"2026-10-07T17:24:04.435277+03:00","ts_end":"2026-10-07T17:24:09.945903+03:00","tokens":{"input":481,"output":230,"cache_read":0,"cache_write":0,"reasoning":176},"latency_s":4.734,"source":{"file":"effort-dial__effort_pack__raw__claude-fable-5-1.jsonl.gz","line":5},"forbidden":[]},{"id":"no-letter-e:claude-fable-5-1|main|en-06-L3#t0#a0","model_key":"claude-fable-5-1","model_id":"claude-fable-5-1","model_name":"Claude Fable 5.1","lab":"Anthropic","route":"claude_code","served_by":"claude-fable-5-1","run_id":"main","phase":"main","prompt_id":"en-06-L3","run_index":0,"condition":{"length":"L3","topic_idx":6},"attempt":0,"ok":true,"text":"I walk into a bright room, palms damp, holding my CV.\nA calm boss asks about my past work and my aims for tomorrow.\nI talk with grit, nod, and walk out hoping that job is in my hands.","finish_reason":"end_turn","verdict":{"label":"zero-e","value":0,"flags":[],"recorded":{"pass_primary":true,"joint":true,"dict_rate":0.9743589743589743}},"in_headline":true,"ts_start":"2026-10-07T17:24:09.533001+03:00","ts_end":"2026-10-07T17:24:18.178424+03:00","tokens":{"input":482,"output":360,"cache_read":0,"cache_write":0,"reasoning":289},"latency_s":7.935,"source":{"file":"effort-dial__effort_pack__raw__claude-fable-5-1.jsonl.gz","line":6},"forbidden":[]},{"id":"no-letter-e:claude-fable-5-1|main|en-07-L3#t0#a0","model_key":"claude-fable-5-1","model_id":"claude-fable-5-1","model_name":"Claude Fable 5.1","lab":"Anthropic","route":"claude_code","served_by":"claude-fable-5-1","run_id":"main","phase":"main","prompt_id":"en-07-L3","run_index":0,"condition":{"length":"L3","topic_idx":7},"attempt":0,"ok":true,"text":"A small glass slab sits in my palm, glowing at dawn.\nIt hums and lights up with a call from my mom.\nI tap, I talk, I scroll until midnight; my thumb finally stops.","finish_reason":"end_turn","verdict":{"label":"zero-e","value":0,"flags":[],"recorded":{"pass_primary":true,"joint":true,"dict_rate":0.9705882352941176}},"in_headline":true,"ts_start":"2026-10-07T17:24:09.959364+03:00","ts_end":"2026-10-07T17:24:20.818877+03:00","tokens":{"input":482,"output":501,"cache_read":0,"cache_write":0,"reasoning":435},"latency_s":10.224,"source":{"file":"effort-dial__effort_pack__raw__claude-fable-5-1.jsonl.gz","line":7},"forbidden":[]},{"id":"no-letter-e:claude-fable-5-1|main|en-08-L3#t0#a0","model_key":"claude-fable-5-1","model_id":"claude-fable-5-1","model_name":"Claude Fable 5.1","lab":"Anthropic","route":"claude_code","served_by":"claude-fable-5-1","run_id":"main","phase":"main","prompt_id":"en-08-L3","run_index":0,"condition":{"length":"L3","topic_idx":8},"attempt":0,"ok":true,"text":"Today you turn a full lap around our sun.\nLight a wax wick, pals sing, hands clap.\nMay this day bring you joy, good food, and lots of laughs.","finish_reason":"end_turn","verdict":{"label":"zero-e","value":0,"flags":[],"recorded":{"pass_primary":true,"joint":true,"dict_rate":1.0}},"in_headline":true,"ts_start":"2026-10-07T17:24:18.218810+03:00","ts_end":"2026-10-07T17:24:29.825448+03:00","tokens":{"input":483,"output":318,"cache_read":0,"cache_write":0,"reasoning":262},"latency_s":10.953,"source":{"file":"effort-dial__effort_pack__raw__claude-fable-5-1.jsonl.gz","line":8},"forbidden":[]},{"id":"no-letter-e:claude-fable-5-1|main|en-10-L3#t0#a0","model_key":"claude-fable-5-1","model_id":"claude-fable-5-1","model_name":"Claude Fable 5.1","lab":"Anthropic","route":"claude_code","served_by":"claude-fable-5-1","run_id":"main","phase":"main","prompt_id":"en-10-L3","run_index":0,"condition":{"length":"L3","topic_idx":10},"attempt":0,"ok":true,"text":"A bright orb hangs in night's dark sky,\ncasting soft light on hills and bay,\nit grows, it shrinks, and glows till day.","finish_reason":"end_turn","verdict":{"label":"zero-e","value":0,"flags":[],"recorded":{"pass_primary":true,"joint":true,"dict_rate":0.9583333333333334}},"in_headline":true,"ts_start":"2026-10-07T17:24:29.838818+03:00","ts_end":"2026-10-07T17:24:36.667263+03:00","tokens":{"input":481,"output":238,"cache_read":0,"cache_write":0,"reasoning":190},"latency_s":6.264,"source":{"file":"effort-dial__effort_pack__raw__claude-fable-5-1.jsonl.gz","line":9},"forbidden":[]},{"id":"no-letter-e:claude-fable-5-1|main|en-09-L3#t0#a0","model_key":"claude-fable-5-1","model_id":"claude-fable-5-1","model_name":"Claude Fable 5.1","lab":"Anthropic","route":"claude_code","served_by":"claude-fable-5-1","run_id":"main","phase":"main","prompt_id":"en-09-L3","run_index":0,"condition":{"length":"L3","topic_idx":9},"attempt":0,"ok":true,"text":"Football is a sport with two squads and a ball.\nFans shout, chant, and sing as a goal is put in.\nA champion wins a cup and lifts it high.","finish_reason":"end_turn","verdict":{"label":"zero-e","value":0,"flags":[],"recorded":{"pass_primary":true,"joint":true,"dict_rate":1.0}},"in_headline":true,"ts_start":"2026-10-07T17:24:20.843998+03:00","ts_end":"2026-10-07T17:24:38.076292+03:00","tokens":{"input":481,"output":241,"cache_read":0,"cache_write":0,"reasoning":187},"latency_s":16.596,"source":{"file":"effort-dial__effort_pack__raw__claude-fable-5-1.jsonl.gz","line":10},"forbidden":[]},{"id":"no-letter-e:claude-opus-5-5|main|en-01-L3#t0#a0","model_key":"claude-opus-5-5","model_id":"claude-opus-5-5","model_name":"Claude Opus 5.5","lab":"Anthropic","route":"claude_code","served_by":"claude-opus-5-5","run_id":"main","phase":"main","prompt_id":"en-01-L3","run_index":0,"condition":{"length":"L3","topic_idx":1},"attempt":0,"ok":true,"text":"Vast aqua swirls roll on and on,\nSalt winds sing of coral and mist,\nA world of moonlit calm, dark and long.","finish_reason":"end_turn","verdict":{"label":"zero-e","value":0,"flags":[],"recorded":{"pass_primary":true,"joint":true,"dict_rate":1.0}},"in_headline":true,"ts_start":"2026-10-07T17:23:13.849024+03:00","ts_end":"2026-10-07T17:23:23.826682+03:00","tokens":{"input":484,"output":351,"cache_read":0,"cache_write":0,"reasoning":303},"latency_s":9.405,"source":{"file":"effort-dial__effort_pack__raw__claude-opus-5-5.jsonl.gz","line":1},"forbidden":[]},{"id":"no-letter-e:claude-opus-5-5|main|en-02-L3#t0#a0","model_key":"claude-opus-5-5","model_id":"claude-opus-5-5","model_name":"Claude Opus 5.5","lab":"Anthropic","route":"claude_code","served_by":"claude-opus-5-5","run_id":"main","phase":"main","prompt_id":"en-02-L3","run_index":0,"condition":{"length":"L3","topic_idx":2},"attempt":0,"ok":true,"text":"A small cat naps in a warm spot of sun,\nIt purrs and stirs, a soft gray ball of fluff,\nAnd slips away to hunt a passing moth.","finish_reason":"end_turn","verdict":{"label":"zero-e","value":0,"flags":[],"recorded":{"pass_primary":true,"joint":true,"dict_rate":1.0}},"in_headline":true,"ts_start":"2026-10-07T17:23:15.284363+03:00","ts_end":"2026-10-07T17:23:24.575126+03:00","tokens":{"input":482,"output":294,"cache_read":0,"cache_write":0,"reasoning":239},"latency_s":8.716,"source":{"file":"effort-dial__effort_pack__raw__claude-opus-5-5.jsonl.gz","line":2},"forbidden":[]},{"id":"no-letter-e:claude-opus-5-5|main|en-03-L3#t0#a0","model_key":"claude-opus-5-5","model_id":"claude-opus-5-5","model_name":"Claude Opus 5.5","lab":"Anthropic","route":"claude_code","served_by":"claude-opus-5-5","run_id":"main","phase":"main","prompt_id":"en-03-L3","run_index":0,"condition":{"length":"L3","topic_idx":3},"attempt":0,"ok":true,"text":"A warm cup at dawn, dark and strong,\nIts rich aroma drifts across my room,\nI sip slowly, and my day starts bright.","finish_reason":"end_turn","verdict":{"label":"zero-e","value":0,"flags":[],"recorded":{"pass_primary":true,"joint":true,"dict_rate":1.0}},"in_headline":true,"ts_start":"2026-10-07T17:23:23.831020+03:00","ts_end":"2026-10-07T17:23:28.975326+03:00","tokens":{"input":483,"output":192,"cache_read":0,"cache_write":0,"reasoning":143},"latency_s":4.324,"source":{"file":"effort-dial__effort_pack__raw__claude-opus-5-5.jsonl.gz","line":3},"forbidden":[]},{"id":"no-letter-e:claude-opus-5-5|main|en-04-L3#t0#a0","model_key":"claude-opus-5-5","model_id":"claude-opus-5-5","model_name":"Claude Opus 5.5","lab":"Anthropic","route":"claude_code","served_by":"claude-opus-5-5","run_id":"main","phase":"main","prompt_id":"en-04-L3","run_index":0,"condition":{"length":"L3","topic_idx":4},"attempt":0,"ok":true,"text":"Moonlight falls on tall, dim buildings,\nCars hum along damp black roads,\nAnd a city of glass glows all night 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thought.","finish_reason":"end_turn","verdict":{"label":"zero-e","value":0,"flags":[],"recorded":{"pass_primary":true,"joint":true,"dict_rate":1.0}},"in_headline":true,"ts_start":"2026-10-07T17:23:29.980776+03:00","ts_end":"2026-10-07T17:23:37.338720+03:00","tokens":{"input":483,"output":411,"cache_read":0,"cache_write":0,"reasoning":344},"latency_s":6.795,"source":{"file":"effort-dial__effort_pack__raw__claude-opus-5-5.jsonl.gz","line":5},"forbidden":[]},{"id":"no-letter-e:claude-opus-5-5|main|en-05-L3#t0#a0","model_key":"claude-opus-5-5","model_id":"claude-opus-5-5","model_name":"Claude Opus 5.5","lab":"Anthropic","route":"claude_code","served_by":"claude-opus-5-5","run_id":"main","phase":"main","prompt_id":"en-05-L3","run_index":0,"condition":{"length":"L3","topic_idx":5},"attempt":0,"ok":true,"text":"Soft drops fall on dusty roofs at dusk,\nA cool, gray sky hums a soft, wild song,\nAnd thirsty land drinks till morning 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hooray!","finish_reason":"end_turn","verdict":{"label":"zero-e","value":0,"flags":[],"recorded":{"pass_primary":true,"joint":true,"dict_rate":0.9230769230769231}},"in_headline":true,"ts_start":"2026-10-07T17:22:58.428776+03:00","ts_end":"2026-10-07T17:23:05.843915+03:00","tokens":{"input":487,"output":568,"cache_read":0,"cache_write":0,"reasoning":515},"latency_s":6.849,"source":{"file":"effort-dial__effort_pack__raw__claude-sonnet-5-5.jsonl.gz","line":7},"forbidden":[]},{"id":"no-letter-e:claude-sonnet-5-5|main|en-07-L3#t0#a0","model_key":"claude-sonnet-5-5","model_id":"claude-sonnet-5-5","model_name":"Claude Sonnet 5.5","lab":"Anthropic","route":"claude_code","served_by":"claude-sonnet-5-5","run_id":"main","phase":"main","prompt_id":"en-07-L3","run_index":0,"condition":{"length":"L3","topic_idx":7},"attempt":0,"ok":true,"text":"A glowing android calls through my night.\nIts bright glass lights up and I talk to folks far away.\nBuzz, ring, chirp, I grab it fast.","finish_reason":"end_turn","verdict":{"label":"zero-e","value":0,"flags":[],"recorded":{"pass_primary":true,"joint":true,"dict_rate":1.0}},"in_headline":true,"ts_start":"2026-10-07T17:22:58.337833+03:00","ts_end":"2026-10-07T17:23:05.964005+03:00","tokens":{"input":485,"output":530,"cache_read":0,"cache_write":0,"reasoning":477},"latency_s":7.07,"source":{"file":"effort-dial__effort_pack__raw__claude-sonnet-5-5.jsonl.gz","line":8},"forbidden":[]},{"id":"no-letter-e:claude-sonnet-5-5|main|en-09-L3#t0#a0","model_key":"claude-sonnet-5-5","model_id":"claude-sonnet-5-5","model_name":"Claude Sonnet 5.5","lab":"Anthropic","route":"claude_code","served_by":"claude-sonnet-5-5","run_id":"main","phase":"main","prompt_id":"en-09-L3","run_index":0,"condition":{"length":"L3","topic_idx":9},"attempt":0,"ok":true,"text":"Football is a thrilling sport; fans sing, shout and cry.\nA bold forward runs, spins, and shoots a ball into a goal.\nOur squad trains hard, and a big win lifts a 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Corrected:\n\nA calm moon hangs high in a dark sky.\nIts pallid glow falls on hills and001 77\nIts orbit is calm and slow.","finish_reason":"end_turn","verdict":{"label":"has-e","value":5,"flags":["wrong_length"],"recorded":{"pass_primary":false,"joint":false,"dict_rate":0.9607843137254902}},"in_headline":true,"ts_start":"2026-10-07T17:23:05.967019+03:00","ts_end":"2026-10-07T17:23:15.281391+03:00","tokens":{"input":485,"output":780,"cache_read":0,"cache_write":0,"reasoning":665},"latency_s":8.76,"source":{"file":"effort-dial__effort_pack__raw__claude-sonnet-5-5.jsonl.gz","line":10},"forbidden":[120,129,141,149,152]}]}