Run: 2026-02-24-01KJ8W37XM21M9V4ADT0NE986Z

Model input

User/Human
Rewrite the following passage converting all passive voice constructions in the narration to active voice. Rules: 1. **Convert agented passives directly.** When the sentence contains "by [agent]", make that agent the subject. - Example: "The door had been forced open by the intruder." → "The intruder had forced the door open." 2. **Infer the agent when not stated.** Some passive sentences don't name who performed the action. Use context clues from surrounding sentences to determine the correct agent. - Example: If the text says "The lock had been pried loose" right after describing what the intruder did, use "The intruder" as the subject. 3. **Leave truly agentless passives unchanged.** If there is genuinely no way to determine who performed the action from the surrounding context, leave the sentence in passive voice. 4. **Do NOT change dialogue.** Leave all words inside quotation marks exactly as written. Only transform narration. 5. **Do NOT change non-passive constructions.** Copulas with adjectives ("was consistent", "were deep") are NOT passive voice — leave them unchanged. 6. **Preserve everything else exactly.** Same paragraph structure, same punctuation, same word choices for all non-passive text. Return only the rewritten passage, nothing else. <text> The gallery had been closed to the public since Tuesday. Detective Nadia Voss ducked under the yellow tape and stepped inside. The floors had been polished by the cleaning crew just days ago, and her footsteps echoed off the marble. The front door had been forced open by the intruder. Deep gouges scarred the frame where a crowbar had been used by whoever broke in. Nadia crouched and examined the splintered wood. The lock had been pried loose and tossed aside. "Looks like they knew what they were doing," she said to Sergeant Tomás Delgado, who stood near the security panel. "This wasn't some teenager with a brick." "Not even close," Tomás replied. He pointed at the open panel. "Look at the wiring — clean cuts, no tearing. They even knew about the backup." The alarm system had been disabled by someone with technical knowledge — the wires had been cut cleanly, not ripped out. A backup battery had also been removed. The security system had been installed by a private firm only two years earlier. Nadia straightened up and walked toward the main hall. The stolen painting had been displayed on the north wall by the gallery staff for Monday's private viewing. Only the mounting brackets remained. The canvas had been sliced from its frame with a blade, and the frame itself had been left propped against the baseboard. "The Whitmore," she murmured. "Three years ago it almost went to auction. I can't believe it ended up in a place like this." "It was worth more than this whole building," Tomás said. "Crane bragged about it at every opening night. He must be devastated." A guest list had been compiled by the gallery owner, Mr. Crane, and handed to the police that morning. Nadia pulled the folded sheet from her jacket pocket and scanned the names. Twenty-three guests had been invited to Monday's viewing. Every one of them had been vetted by Crane's staff before the event. Two names had been circled in red by Crane himself. "Was anyone unaccounted for after ten o'clock?" Nadia asked. "Two guests left early," Tomás said, flipping through his notes. "I already checked — both alibis hold up. But the caterer's van wasn't logged out until midnight. Nobody can tell me who was driving it." Nadia frowned. She turned toward the back corridor. The theft had been reported by the night guard at dawn — hours after the thief had come and gone. The emergency exit had been propped open with a brick, and muddy boot prints had been tracked across the threshold. The brick had been wiped clean of fingerprints. "Someone came in through the back," she said. "That much is obvious. The question is how they knew exactly which camera to hit." "Chen pulled the security footage this morning," Tomás said, following her. "The rear camera was spray-painted over at eleven fifteen. Everything else kept rolling, but that one angle — gone. Nothing useful after that." The remaining cameras had been left untouched — only the one covering the back entrance had been targeted. Nadia crouched beside the boot prints. They were deep and evenly spaced — size eleven, maybe twelve. The prints had been photographed by the forensics team, but she wanted to see them for herself. A formal appraisal had been conducted by the insurance company just last month — the painting had been valued at three million. Nadia stood and brushed off her knees. The case would not be solved quickly — she was certain of that. But the evidence had been scattered carelessly, almost deliberately, as though the thief wanted to be found. </text>

Model response

AI
The police had closed the gallery to the public since Tuesday. Detective Nadia Voss ducked under the yellow tape and stepped inside. The cleaning crew had polished the floors just days ago, and her footsteps echoed off the marble. The intruder had forced the front door open. Deep gouges scarred the frame where whoever broke in had used a crowbar. Nadia crouched and examined the splintered wood. The intruder had pried the lock loose and tossed it aside. "Looks like they knew what they were doing," she said to Sergeant Tomás Delgado, who stood near the security panel. "This wasn't some teenager with a brick." "Not even close," Tomás replied. He pointed at the open panel. "Look at the wiring — clean cuts, no tearing. They even knew about the backup." Someone with technical knowledge had disabled the alarm system — the intruder had cut the wires cleanly, not ripped them out. The intruder had also removed a backup battery. A private firm had installed the security system only two years earlier. Nadia straightened up and walked toward the main hall. The gallery staff had displayed the stolen painting on the north wall for Monday's private viewing. Only the mounting brackets remained. The thief had sliced the canvas from its frame with a blade and left the frame itself propped against the baseboard. "The Whitmore," she murmured. "Three years ago it almost went to auction. I can't believe it ended up in a place like this." "It was worth more than this whole building," Tomás said. "Crane bragged about it at every opening night. He must be devastated." The gallery owner, Mr. Crane, had compiled a guest list and handed it to the police that morning. Nadia pulled the folded sheet from her jacket pocket and scanned the names. Crane had invited twenty-three guests to Monday's viewing. Crane's staff had vetted every one of them before the event. Crane himself had circled two names in red. "Was anyone unaccounted for after ten o'clock?" Nadia asked. "Two guests left early," Tomás said, flipping through his notes. "I already checked — both alibis hold up. But the caterer's van wasn't logged out until midnight. Nobody can tell me who was driving it." Nadia frowned. She turned toward the back corridor. The night guard had reported the theft at dawn — hours after the thief had come and gone. The thief had propped the emergency exit open with a brick and tracked muddy boot prints across the threshold. The thief had wiped the brick clean of fingerprints. "Someone came in through the back," she said. "That much is obvious. The question is how they knew exactly which camera to hit." "Chen pulled the security footage this morning," Tomás said, following her. "The rear camera was spray-painted over at eleven fifteen. Everything else kept rolling, but that one angle — gone. Nothing useful after that." The intruder had left the remaining cameras untouched — they had targeted only the one covering the back entrance. Nadia crouched beside the boot prints. They were deep and evenly spaced — size eleven, maybe twelve. The forensics team had photographed the prints, but she wanted to see them for herself. The insurance company had conducted a formal appraisal just last month — they had valued the painting at three million. Nadia stood and brushed off her knees. She would not solve the case quickly — she was certain of that. But the thief had scattered the evidence carelessly, almost deliberately, as though they wanted to be found.
created_at"2026-02-24T22:25:11.614Z" 2/24/2026, 10:25:11 PM
model"anthropic/claude-4.6-opus-20260205"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1543
moderation_latency303
generation_time94573
tokens_prompt1251
tokens_completion2203
native_tokens_prompt1161
native_tokens_completion6591
native_tokens_completion_images(null)
native_tokens_reasoning1300
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"stop"
usage0.17058
router(null)
provider_responses
0
endpoint_id"a8708fb9-08ea-43bb-a3b1-165c87ef09df"
id"ca25bb23-ea55-4175-b663-7cbef77bba8f"
is_byokfalse
latency1542
model_permaslug"anthropic/claude-4.6-opus-20260205"
provider_name"Amazon Bedrock"
status200
api_type"completions"
id"gen-1771971911-TZ8ikaIKrloS16GGaRQ7"
upstream_id"ca25bb23-ea55-4175-b663-7cbef77bba8f"
total_cost0.17058
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock"

Evaluation details

Result Evaluator Details Meta Data
100.00% No hallucinated or fabricated content
58/58 output sentences traceable to original
totalOutputSentences58
groundedCount58
ungroundedCount0
ungroundedSentences(empty)
100.00% Dialogue content preserved unchanged
10/10 dialogue lines preserved unchanged
matched10
total10
details
0
id"dlg-01"
paragraphFoundtrue
preservedtrue
1
id"dlg-02"
paragraphFoundtrue
preservedtrue
2
id"dlg-03"
paragraphFoundtrue
preservedtrue
3
id"dlg-04"
paragraphFoundtrue
preservedtrue
4
id"dlg-05"
paragraphFoundtrue
preservedtrue
5
id"dlg-06"
paragraphFoundtrue
preservedtrue
6
id"dlg-07"
paragraphFoundtrue
preservedtrue
7
id"dlg-08"
paragraphFoundtrue
preservedtrue
8
id"dlg-09"
paragraphFoundtrue
preservedtrue
9
id"dlg-10"
paragraphFoundtrue
preservedtrue
87.50% Non-passive narration preserved
7/8 narration anchors preserved
matched7
total8
details
0
id"anc-01"
paragraphFoundtrue
preservedfalse
1
id"anc-02"
paragraphFoundtrue
preservedtrue
2
id"anc-03"
paragraphFoundtrue
preservedtrue
3
id"anc-04"
paragraphFoundtrue
preservedtrue
4
id"anc-05"
paragraphFoundtrue
preservedtrue
5
id"anc-06"
paragraphFoundtrue
preservedtrue
6
id"anc-07"
paragraphFoundtrue
preservedtrue
7
id"anc-08"
paragraphFoundtrue
preservedtrue
100.00% Passive → active voice transformations
26/26 passive sentences correctly rewritten
neededCleanfalse
matched26
total26
details
0
id"pa01"
paragraphFoundtrue
correcttrue
matched"The cleaning crew had polished the floors just days ago"
expected
0"The cleaning crew had polished the floors just days ago"
1"The cleaning crew had polished the floors only days ago"
difficulty"easy"
1
id"pa02"
paragraphFoundtrue
correcttrue
matched"The intruder had forced the front door open"
expected
0"The intruder had forced the front door open"
1"The intruder had forced open the front door"
difficulty"easy"
2
id"pa03"
paragraphFoundtrue
correcttrue
matched"whoever broke in had used a crowbar"
expected
0"whoever broke in had used a crowbar"
1"the intruder had used a crowbar"
difficulty"easy"
3
id"pa04"
paragraphFoundtrue
correcttrue
matched"(?:the intruder|someone|whoever broke in) had pried (?:the lock loose|loose the lock) and tossed (?:it )?aside"
expected
0"(?:the intruder|someone|whoever broke in) had pried (?:the lock loose|loose the lock) and tossed (?:it )?aside"
requiresInferencetrue
difficulty"hard"
4
id"pa05"
paragraphFoundtrue
correcttrue
matched"Someone with technical knowledge had disabled the alarm system"
expected
0"Someone with technical knowledge had disabled the alarm system"
1"Someone with technical knowledge had disabled the alarm"
difficulty"easy"
5
id"pa06"
paragraphFoundtrue
correcttrue
matched"(?:they|someone|the intruder|this person|whoever it was|that person) had cut the wires cleanly, not ripped them out"
expected
0"(?:they|someone|the intruder|this person|whoever it was|that person) had cut the wires cleanly, not ripped them out"
requiresInferencetrue
difficulty"hard"
6
id"pa07"
paragraphFoundtrue
correcttrue
matched"(?:they|someone|the intruder|this person|someone with technical knowledge) had (?:also removed (?:a|the) backup battery|removed (?:a|the) backup battery as well)"
expected
0"(?:they|someone|the intruder|this person|someone with technical knowledge) had (?:also removed (?:a|the) backup battery|removed (?:a|the) backup battery as well)"
requiresInferencetrue
difficulty"hard"
7
id"pa08"
paragraphFoundtrue
correcttrue
matched"A private firm had installed the security system only two years earlier"
expected
0"A private firm had installed the security system only two years earlier"
1"A private firm had installed the security system just two years earlier"
difficulty"easy"
8
id"pa09"
paragraphFoundtrue
correcttrue
matched"The gallery staff had displayed the stolen painting on the north wall for Monday's private viewing"
expected
0"The gallery staff had displayed the stolen painting on the north wall for Monday's private viewing"
1"The gallery staff had displayed the painting on the north wall for Monday's private viewing"
difficulty"easy"
9
id"pa10"
paragraphFoundtrue
correcttrue
matched"(?:the (?:thief|intruder)|someone) had sliced the canvas from its frame with a blade"
expected
0"(?:the (?:thief|intruder)|someone) had sliced the canvas from its frame with a blade"
requiresInferencetrue
difficulty"hard"
10
id"pa11"
paragraphFoundtrue
correcttrue
matched"and(?: had)? left the frame(?: itself)? propped against the baseboard"
expected
0"(?:the (?:thief|intruder)|someone|they)(?: had)? left the frame(?: itself)? propped against the baseboard"
1"and(?: had)? left the frame(?: itself)? propped against the baseboard"
requiresInferencetrue
difficulty"hard"
11
id"pa12"
paragraphFoundtrue
correcttrue
matched"The gallery owner, Mr. Crane, had compiled a guest list and handed it to the police that morning"
expected
0"The gallery owner, Mr. Crane, had compiled a guest list and handed it to the police that morning"
1"Mr. Crane, the gallery owner, had compiled a guest list and handed it to the police that morning"
2"The gallery owner, Mr. Crane, had compiled a guest list and handed to the police that morning"
3"Mr. Crane had compiled a guest list and handed it to the police that morning"
difficulty"easy"
12
id"pa13"
paragraphFoundtrue
correcttrue
matched"(?:crane|mr\\.? crane|he|crane's staff|the gallery staff) had invited twenty-three guests to monday's viewing"
expected
0"(?:crane|mr\\.? crane|he|crane's staff|the gallery staff) had invited twenty-three guests to monday's viewing"
requiresInferencetrue
difficulty"hard"
13
id"pa14"
paragraphFoundtrue
correcttrue
matched"Crane's staff had vetted every one of them before the event"
expected
0"Crane's staff had vetted every one of them before the event"
difficulty"easy"
14
id"pa15"
paragraphFoundtrue
correcttrue
matched"Crane himself had circled two names in red"
expected
0"Crane himself had circled two names in red"
1"Crane had circled two names in red himself"
difficulty"easy"
15
id"pa16"
paragraphFoundtrue
correcttrue
matched"The night guard had reported the theft at dawn"
expected
0"The night guard had reported the theft at dawn"
difficulty"easy"
16
id"pa17"
paragraphFoundtrue
correcttrue
matched"(?:someone|the (?:thief|intruder)) had propped (?:the emergency exit open|open the emergency exit) with a brick"
expected
0"(?:someone|the (?:thief|intruder)) had propped (?:the emergency exit open|open the emergency exit) with a brick"
requiresInferencetrue
difficulty"hard"
17
id"pa18"
paragraphFoundtrue
correcttrue
matched"(?:someone|the (?:intruder|thief)|they|and)(?: had)? tracked muddy boot prints across the threshold"
expected
0"(?:someone|the (?:intruder|thief)|they|and)(?: had)? tracked muddy boot prints across the threshold"
requiresInferencetrue
difficulty"hard"
18
id"pa19"
paragraphFoundtrue
correcttrue
matched"(?:someone|the (?:thief|intruder)) had wiped the brick clean of fingerprints"
expected
0"(?:someone|the (?:thief|intruder)) had wiped the brick clean of fingerprints"
requiresInferencetrue
difficulty"hard"
19
id"pa20"
paragraphFoundtrue
correcttrue
matched"(?:the (?:thief|intruder)|someone|they) had left the remaining cameras untouched"
expected
0"(?:the (?:thief|intruder)|someone|they) had left the remaining cameras untouched"
requiresInferencetrue
difficulty"hard"
20
id"pa21"
paragraphFoundtrue
correcttrue
matched"(?:the (?:thief|intruder)|someone|they) had (?:targeted only|only targeted) the one covering the back entrance"
expected
0"(?:the (?:thief|intruder)|someone|they) had (?:targeted only|only targeted) the one covering the back entrance"
requiresInferencetrue
difficulty"hard"
21
id"pa22"
paragraphFoundtrue
correcttrue
matched"The forensics team had photographed the prints"
expected
0"The forensics team had photographed the prints"
1"The forensic team had photographed the prints"
difficulty"easy"
22
id"pa23"
paragraphFoundtrue
correcttrue
matched"The insurance company had conducted a formal appraisal just last month"
expected
0"The insurance company had conducted a formal appraisal just last month"
difficulty"easy"
23
id"pa24"
paragraphFoundtrue
correcttrue
matched"(?:the insurance company|they|it) had valued the painting at three million"
expected
0"(?:the insurance company|they|it) had valued the painting at three million"
requiresInferencetrue
difficulty"hard"
24
id"pa25"
paragraphFoundtrue
correcttrue
matched"(?:they|she) would not solve the case quickly"
expected
0"(?:no one|nobody) would solve the case quickly"
1"(?:they|she) would not solve the case quickly"
requiresInferencetrue
difficulty"hard"
25
id"pa26"
paragraphFoundtrue
correcttrue
matched"(?:the (?:thief|intruder)|someone) had scattered the evidence carelessly"
expected
0"(?:the (?:thief|intruder)|someone) had scattered the evidence carelessly"
requiresInferencetrue
difficulty"hard"
easyMatched12
easyTotal12
hardMatched14
hardTotal14
inferenceMatched14
inferenceTotal14
100.00% Structural similarity to original
Words: 100%, Paragraphs: 100%, Sentences: 100%
wordCountScore1
paragraphCountScore1
sentenceCountScore1
originalWords606
outputWords589
originalParagraphs15
outputParagraphs15
originalSentences58
outputSentences58
97.5000%