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Run: 2026-04-24-01KPZTZD5PVM20ME3240XNKVFW
Run Details
Model:
Claude Opus 4.7
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
5.6s
Cost:
$0.009175
Provider:
Amazon Bedrock
Evaluation summary
Score
Evaluator
Details Link
80.33%
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
Rain hammered against the bay windows of Ravenscroft Manor as midnight approached and the grandfather clock began its mournful chime. Inspector Harold Blackwood stepped carefully across the marble foyer, his polished shoes echoing loudly through the silent, cavernous hall. The butler, pale and trembling, gestured weakly toward the library door with one gloved hand held firmly against his chest. Lord Ashworth lay sprawled beside the fireplace, a silver letter opener buried deep within his starched white dinner shirt. Seven guests huddled together near the velvet curtains, their faces betraying shock, suspicion, grief, and something else entirely unreadable. A single crystal wineglass rested on the Persian rug, its contents staining the intricate pattern a deep, ominous crimson shade. Blackwood knelt beside the body, noting the peculiar absence of struggle and the strange smile frozen on the victim's face. Someone in this room had committed murder, and every person present possessed both motive and opportunity to end Ashworth's miserable life.
created_at
"2026-04-24T13:30:56.581Z"
4/24/2026, 1:30:56 PM
model
"anthropic/claude-4.7-opus-20260416"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
917
moderation_latency
(null)
generation_time
5532
tokens_prompt
46
tokens_completion
265
native_tokens_prompt
65
native_tokens_completion
354
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)
num_fetches
(null)
web_search_engine
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"end_turn"
usage
0.009175
router
(null)
provider_responses
0
endpoint_id
"0fa65117-00d9-4835-808d-9b68041d9ce4"
id
"86eb149b-d884-491c-8905-66b3dceaa1fc"
is_byok
false
latency
917
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-1777037456-9gYAMzRKz3PGTjjJndbl"
session_id
(null)
api_type
"completions"
id
"gen-1777037456-1HHTBQOAH2r9iGD88x7V"
upstream_id
"86eb149b-d884-491c-8905-66b3dceaa1fc"
total_cost
0.009175
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
response_cache_source_id
(null)
Evaluation details
Result
Evaluator
Details
Meta Data
80.33%
Matches word count
n/a
neededClean
false
sentences
8
wordCounts
0
20
1
19
2
20
3
19
4
19
5
20
6
20
7
21