NC Bench
Overview
About
Tests
Categories
Models
Vendors
Compare
Run: 2026-04-24-01KQ0G090V1R4ZB14D5PMB8Q4V
Run Details
Model:
Claude Opus 4.7 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
14.9s
Cost:
$0.068225
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 rain had been falling against the windows of Ashford Manor for three long hours before anyone noticed the silence. Detective Margaret Hollis stepped carefully across the polished marble floor, her leather boots leaving faint wet prints behind her steps. Candles flickered dimly inside the grand hall where six guests had gathered earlier that evening for a private dinner party. Now only five of them remained alive, huddled together near the fireplace, each trying to avoid every other person's gaze. The body of Lord Ashford lay sprawled across the crimson rug, a silver letter opener buried deep in his chest. Margaret crouched down beside him, examining the wound carefully, noting how the blood had already begun to dry and darken. Someone in this room, she thought grimly, had committed the murder, and nobody would be leaving until she uncovered them.
created_at
"2026-04-24T19:38:25.183Z"
4/24/2026, 7:38:25 PM
model
"anthropic/claude-4.7-opus-20260416"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2135
moderation_latency
(null)
generation_time
14854
tokens_prompt
46
tokens_completion
355
native_tokens_prompt
65
native_tokens_completion
2716
native_tokens_completion_images
(null)
native_tokens_reasoning
139
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
num_fetches
(null)
web_search_engine
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"end_turn"
usage
0.068225
router
(null)
provider_responses
0
endpoint_id
"0fa65117-00d9-4835-808d-9b68041d9ce4"
id
"01d69c15-bc04-42c4-a315-a120f29fd787"
is_byok
false
latency
690
model_permaslug
"anthropic/claude-4.7-opus-20260416"
provider_name
"Amazon Bedrock"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.14.1; linux; x64))"
http_referer
(null)
request_id
"req-1777059505-O4la7L5ltdbru2Dqy7S0"
session_id
(null)
api_type
"completions"
id
"gen-1777059505-5v2UnfGZ2uwF7No4Ihyg"
upstream_id
"01d69c15-bc04-42c4-a315-a120f29fd787"
total_cost
0.068225
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
response_cache_source_id
(null)
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
7
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20