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Run: 2026-10-08-01M4DA9N8WHP8E5CACCFWDSE6F
Run Details
Model:
Claude Haiku 5.5 (Reasoning, Medium)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
14.1s
Cost:
$0.001383
Provider:
Claude Platform on AWS
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
Rain had fallen over Ashford Manor since dawn, and nobody in the village dared mention the dead body found upstairs. Detective Inspector Harriet Vance stepped from her battered Morris onto the gravel, pulling her collar tight against the cold wind. Her sergeant, young Tom Pryce, waited beneath the stone portico, clutching a notebook he had already soaked completely through itself. Inside, the house smelled of woodsmoke, wet wool, and something sweeter and far more unsettling that Harriet recognized at once. Lord Edmund Ashford lay slumped across his leather armchair, a silver letter opener jutting obscenely from beneath his left ribs. Every door in Ashford Manor had been locked from the inside, and each guest swore they had heard absolutely nothing.
created_at
"2026-10-08T08:32:52.515Z"
10/8/2026, 8:32:52 AM
model
"anthropic/claude-haiku-5.5-20261007"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2921
moderation_latency
(null)
generation_time
14107
tokens_prompt
46
tokens_completion
479
native_tokens_prompt
62
native_tokens_completion
2753
native_tokens_completion_images
(null)
native_tokens_reasoning
2486
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"
service_tier
"default"
usage
0.0013827
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1791448372-T3vzLHVlUc9hzeLK3LIf"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1791448372-ghHCJLsvQW1DqaKBR1Wq"
upstream_id
"msg_011CfpTevprxBTw9gsNo1hRj"
provider_responses
0
endpoint_id
"b6cdf493-3a61-441f-a134-e7944fddb980"
id
"msg_011CfpTevprxBTw9gsNo1hRj"
is_byok
false
latency
780
model_permaslug
"anthropic/claude-haiku-5.5-20261007"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.0013827
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Claude Platform on AWS"
response_cache_source_id
(null)
data_region
"global"
workspace_id
"97e315e5-d303-487d-83c1-83180e8a13d4"
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