NC Bench
Overview
About
Tests
Models
Vendors
Compare
Run: 2026-02-24-01KJ8V0Z27KQMXC364YBTSQCP2
Run Details
Model:
Claude Opus 4.6 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
40.1s
Cost:
$0.092380
Provider:
Amazon Bedrock
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 20 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
The body lay crumpled at the foot of the grand staircase, her pale hands still clutching a torn red envelope. Detective Harris arrived at the Whitmore estate just after midnight, cold rain dripping from his coat onto the marble floor. No one had heard a scream, and yet the expression frozen on her face suggested she had seen something terrible. The other guests were gathered in the drawing room, each wearing a careful mask of shock and quiet, practiced composure. Lord Whitmore stood by the fireplace, swirling brandy in a crystal glass, refusing to look anyone directly in the eye. His young wife, Catherine, sat in the corner, her silk dress stained with something dark that she refused to explain. The detective noted that every single person in the room had a reason to want the dead woman silenced forever. Outside, thunder rolled across the moors, and the only road leading away from the estate had flooded beyond any crossing. They were all trapped together now, the killer among them, and the long night was only just beginning to unfold. Harris pulled a notebook from his coat pocket and turned to face the room with a gaze that missed nothing.
created_at
"2026-02-24T22:06:28.432Z"
2/24/2026, 10:06:28 PM
model
"anthropic/claude-4.6-opus-20260205"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1511
moderation_latency
162
generation_time
39829
tokens_prompt
46
tokens_completion
887
native_tokens_prompt
61
native_tokens_completion
3683
native_tokens_completion_images
(null)
native_tokens_reasoning
580
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
0.09238
router
(null)
provider_responses
0
endpoint_id
"a8708fb9-08ea-43bb-a3b1-165c87ef09df"
id
"bcb077d9-ab4e-4f15-87d2-a464ebdfddff"
is_byok
false
latency
1416
model_permaslug
"anthropic/claude-4.6-opus-20260205"
provider_name
"Amazon Bedrock"
status
200
api_type
"completions"
id
"gen-1771970788-m3o5DyJoVy8Tok0To047"
upstream_id
"bcb077d9-ab4e-4f15-87d2-a464ebdfddff"
total_cost
0.09238
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20
9
20