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Run: 2026-02-08-01KGYXA3N4TXB8REJ8FFGCPVHQ
Run Details
Model:
Claude Opus 4.6
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
7.5s
Cost:
$0.004495
Provider:
Anthropic
Evaluation summary
Score
Evaluator
Details Link
100.00%
Matches word count
(details)
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 5 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
The body lay perfectly still. Detective Morgan arrived at dawn. Blood stained the white carpet. Nobody heard a single scream. The window was wide open. Cold wind filled the room. Morgan knelt beside the victim. A young woman, eyes closed. Her silk dress was torn. No weapon could be found. The neighbors claimed total ignorance. Something felt deeply, terribly wrong. Morgan studied the crime scene. A broken glass caught light. Red lipstick marked its rim. Two plates sat on table. Dinner for two, it seemed. The candles had burned down. Wax pooled on dark wood. She had known her killer. Morgan pulled out his notebook. This case would prove difficult. The clock read five fifteen. Dawn crept through the curtains. Murder never waits for morning.
created_at
"2026-02-08T15:18:27.317824+00:00"
2/8/2026, 3:18:27 PM
model
"anthropic/claude-4.6-opus-20260205"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1973
moderation_latency
(null)
generation_time
7470
tokens_prompt
35
tokens_completion
155
native_tokens_prompt
44
native_tokens_completion
171
native_tokens_completion_images
(null)
native_tokens_reasoning
0
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"stop"
usage
0.004495
router
(null)
provider_responses
0
id
"msg_01VhHuK6LetWEkBqdPj6TEwc"
status
200
is_byok
false
latency
1973
endpoint_id
"c926c048-563e-44b0-8434-95965bee924c"
provider_name
"Anthropic"
model_permaslug
"anthropic/claude-4.6-opus-20260205"
api_type
"completions"
id
"gen-1770563899-YIyfFtedM8Q3YHwcHPiC"
upstream_id
"msg_01VhHuK6LetWEkBqdPj6TEwc"
total_cost
0.004495
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Anthropic"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
25
wordCounts
0
5
1
5
2
5
3
5
4
5
5
5
6
5
7
5
8
5
9
5
10
5
11
5
12
5
13
5
14
5
15
5
16
5
17
5
18
5
19
5
20
5
21
5
22
5
23
5
24
5