NC Bench
Overview
About
Tests
Models
Model
Claude Haiku 4.5
Test
N-Length Sentences
Scenario
Write sentences with 20 words each
Run ID
2026-02-08-01KGYX8485ZTNMEAFXQW67MYCF
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 20 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
# The Body in the Library The rain fell heavily upon the Victorian mansion, casting dark shadows across every corner of the sprawling estate grounds. Detective Sarah Mitchell stepped out of her car, examining the wet pavement with careful attention to every possible detail. Inside the grand library, beneath towering shelves of leather-bound books, lay the body of renowned philanthropist Marcus Ashford, cold. The victim's face was frozen in an expression of pure terror, his eyes still wide open in final shock and fear. A ornate letter opener protruded from between his shoulder blades, the handle decorated with intricate silver patterns and expensive jewels. Inspector Davies stood near the body, his weathered face betraying no emotion despite decades spent investigating violent deaths and terrible crimes. "Nobody leaves this house until we've interviewed everyone here today," Detective Mitchell announced loudly to the assembled group of suspects. The gathered crowd of houseguests exchanged worried glances, each one wondering who among them could possibly be the ruthless murderer.
created_at
"2026-02-08T15:17:17.993778+00:00"
Sunday, February 8th, 2026 at 3:17:17 PM GMT+00:00
model
"anthropic/claude-4.5-haiku-20251001"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
690
moderation_latency
294
generation_time
2762
tokens_prompt
35
tokens_completion
196
native_tokens_prompt
44
native_tokens_completion
214
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
0.001114
router
(null)
provider_responses
0
id
"0e433e7b-2b0e-4744-ac76-5856440dd9ff"
status
200
is_byok
false
latency
689
endpoint_id
"d000261c-5aeb-47d1-ac87-ad64dbe1cdb6"
provider_name
"Amazon Bedrock"
model_permaslug
"anthropic/claude-4.5-haiku-20251001"
api_type
"completions"
id
"gen-1770563834-N08Hjs5CEJOSL6Zn5x6w"
upstream_id
"0e433e7b-2b0e-4744-ac76-5856440dd9ff"
total_cost
0.001114
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
71.4014%
Matches word count
n/a
neededClean
false
sentences
9
wordCounts
0
6
1
19
2
19
3
20
4
21
5
20
6
21
7
20
8
20