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Run: 2026-10-08-01M4DA89WJHEJH3XT13M9851ES
Run Details
Model:
Claude Haiku 5.5 (Adaptive)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
12.4s
Cost:
$0.001602
Provider:
Claude Platform on AWS
Evaluation summary
Score
Evaluator
Details Link
94.38%
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 not stopped for three days, and Hollow Creek seemed to sink slowly beneath its own gray weight. Detective Inspector Eleanor Vance stood at the edge of the lake, her coat soaked through, staring at the pale body. The victim was Julian Ashworth, a wealthy banker whose famous charm had made him both deeply admired and quietly feared. Nobody in the village had liked him, yet nobody had expected him to die so violently in the flooded boathouse. Constable Thomas Reed lifted the yellow tape, glancing nervously at the small bloody handprint smeared across the cold window glass. Eleanor crouched beside the dark water, noticing a single silver key caught tangled between the reeds near the wooden dock. It was not the sort of clue a careful killer would leave behind, and it deeply troubled her instincts.
created_at
"2026-10-08T08:32:08.09Z"
10/8/2026, 8:32:08 AM
model
"anthropic/claude-haiku-5.5-20261007"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
12332
moderation_latency
(null)
generation_time
12333
tokens_prompt
46
tokens_completion
204
native_tokens_prompt
62
native_tokens_completion
3192
native_tokens_completion_images
(null)
native_tokens_reasoning
2911
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
0.0016022
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1791448328-rHPfXKGnaqg5JQsicc9I"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1791448328-lzc8CeycyIQzCeev4cIr"
upstream_id
"msg_011CfpTbehAyys9VPHf1yJrP"
provider_responses
0
endpoint_id
"b6cdf493-3a61-441f-a134-e7944fddb980"
id
"msg_011CfpTbehAyys9VPHf1yJrP"
is_byok
false
latency
726
model_permaslug
"anthropic/claude-haiku-5.5-20261007"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.0016022
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
94.38%
Matches word count
n/a
neededClean
false
sentences
7
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
19