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Run: 2026-04-24-01KQ0G176HKD9DVFKHB5NSKMTX
Run Details
Model:
Claude Opus 4.7 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
18.5s
Cost:
$0.089100
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 fell heavily on the cobblestone streets of Ravenscroft Manor as Detective Harlow stepped out of his black sedan. A single yellow light flickered weakly in the upstairs window, casting long trembling shadows across the damp and overgrown lawn. He tightened his worn leather coat against the bitter howling wind and noticed the heavy front door standing slightly ajar. Inside the grand marble foyer, a young woman lay motionless beneath the glittering crystal chandelier, her crimson gown perfectly arranged. Detective Harlow knelt beside her, pressing two fingers to her cold pale neck, already certain of what he would discover. From the shadowed staircase high above, someone watched him very carefully, silent and unmoving, clutching a small tarnished silver key.
created_at
"2026-04-24T19:38:56.085Z"
4/24/2026, 7:38:56 PM
model
"anthropic/claude-4.7-opus-20260416"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2670
moderation_latency
(null)
generation_time
18389
tokens_prompt
46
tokens_completion
449
native_tokens_prompt
65
native_tokens_completion
3551
native_tokens_completion_images
(null)
native_tokens_reasoning
255
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
0.0891
router
(null)
provider_responses
0
endpoint_id
"0fa65117-00d9-4835-808d-9b68041d9ce4"
id
"f999fce4-203d-40ef-ab2b-6e43d0438dc1"
is_byok
false
latency
670
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-1777059536-a4s53i96k40DzSI1yIn4"
session_id
(null)
api_type
"completions"
id
"gen-1777059536-JcpklVQ1bLAaKo7bmnSb"
upstream_id
"f999fce4-203d-40ef-ab2b-6e43d0438dc1"
total_cost
0.0891
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
6
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20