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Run: 2026-10-08-01M4DAM0RGENHQDST6XQAP4HRE
Run Details
Model:
Claude Haiku 5.5 (Adaptive)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
8.2s
Cost:
$0.001013
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 Blackmoor Hall for three days, washing gravel paths grey and turning gardens into sodden mud. Inspector Elena Marsh arrived at dawn, her coat buttoned tight against a cold wind that smelled of woodsmoke and fear. The body of Lord Alistair Crane lay face down in the library, one hand still gripping a brass letter opener. Nobody in the household admitted to hearing a single shot, though every guest claimed to have been awake all night. Marsh knelt beside the victim, noting the tilted chair, the untouched brandy, and the smear of ink on his cuff. Something about the scene felt staged, as though someone had wanted the room to tell a story that never happened. Her partner, Sergeant Tom Briggs, was already interviewing the housekeeper in the cramped kitchen at the rear of the house. Briggs looked up as she entered, and his expression told her he had already found something they would both regret.
created_at
"2026-10-08T08:38:31.958Z"
10/8/2026, 8:38:31 AM
model
"anthropic/claude-haiku-5.5-20261007"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
8223
moderation_latency
(null)
generation_time
8223
tokens_prompt
46
tokens_completion
232
native_tokens_prompt
62
native_tokens_completion
2013
native_tokens_completion_images
(null)
native_tokens_reasoning
1699
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
0.0010127
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1791448711-r41JntvaUGbW0MyHNDMs"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1791448711-eF42gWPyKbCiEgFDvTdv"
upstream_id
"msg_011CfpU5wtK2KoHhJa8EDyuv"
provider_responses
0
endpoint_id
"b6cdf493-3a61-441f-a134-e7944fddb980"
id
"msg_011CfpU5wtK2KoHhJa8EDyuv"
is_byok
false
latency
684
model_permaslug
"anthropic/claude-haiku-5.5-20261007"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.0010127
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
8
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20