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Run: 2026-10-08-01M4DA4FHZCX7S7VCFE8MGNCHA
Run Details
Model:
Claude Haiku 5.5 (Adaptive)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
13.6s
Cost:
$0.001730
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
The rain had fallen on Ashford Manor for three long days, and nobody believed the storm would ever finally break. At nine thirty, Eleanor Vance descended the grand staircase, clutching a single unopened letter and her silver pocket watch tightly. Nobody had seen the envelope arrive, yet every single person in the house somehow knew exactly what the letter contained. Her husband, Charles, was already waiting in the library, pouring brandy with unsteady hands that trembled beneath the flickering lamplight. Outside, the gravel drive glistened silver under the pale moon, and the old gardener's lantern swayed near the iron gate. Nobody noticed the figure slipping through the servants' entrance, nor the muddy footprints it left behind on the stone floor. By midnight the house would fall completely silent, and one of its sleeping occupants would never again wake up alive.
created_at
"2026-10-08T08:30:02.825Z"
10/8/2026, 8:30:02 AM
model
"anthropic/claude-haiku-5.5-20261007"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
13521
moderation_latency
(null)
generation_time
13521
tokens_prompt
46
tokens_completion
220
native_tokens_prompt
62
native_tokens_completion
3448
native_tokens_completion_images
(null)
native_tokens_reasoning
3160
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
0.0017302
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1791448202-JKu23fYahbPaLw7GaxSl"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1791448202-lU7hIoJopieBlPq2dbw3"
upstream_id
"msg_011CfpTSRhaGXB5hA1EZ8hcW"
provider_responses
0
endpoint_id
"b6cdf493-3a61-441f-a134-e7944fddb980"
id
"msg_011CfpTSRhaGXB5hA1EZ8hcW"
is_byok
false
latency
778
model_permaslug
"anthropic/claude-haiku-5.5-20261007"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.0017302
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
7
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20