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Run: 2026-10-08-01M4DYBTSPT5EGEST141Q1V0PM
Run Details
Model:
Claude Haiku 5.5 (Reasoning, Max)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
2m 32s
Cost:
$0.020494
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 10 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
The rain had been falling over Blackwood Manor since dusk. Nobody in the household had slept properly since the argument. The quarrel had concerned a will and a forged signature. At dawn, the housekeeper found the study door bolted shut. Detective Inspector Ada Penrose arrived at the house around eight. Ada had spent twenty years chasing clever liars and murderers. Stern ancestors in gilt frames watched her climb the stairs. Her sergeant, Gideon Hale, was pacing outside the study door. Ada stepped carefully past the splintered frame into the study. The body had not been moved from the room yet. Sir Edmund Ashworth lay slumped across his mahogany writing desk. A revolver lay on the carpet beneath his dangling hand. The mantel clock had stopped at a quarter past eleven. Two brandy glasses stood beside him, and one was spotless. "Looks like suicide to me, Inspector," Gideon said, sounding hopeful. Ada crouched beside the desk and studied the carpet closely. Wet footprints crossed the rug and stopped at the bookcase. A cold breeze breathed from somewhere behind those dusty shelves. Someone had come in from the garden during the storm. Sir Edmund had not set foot outdoors in two days. Somewhere in the house, someone was already lying to her.
created_at
"2026-10-08T14:23:35.232Z"
10/8/2026, 2:23:35 PM
model
"anthropic/claude-haiku-5.5-20261007"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
48793
moderation_latency
(null)
generation_time
152152
tokens_prompt
46
tokens_completion
5368
native_tokens_prompt
62
native_tokens_completion
40976
native_tokens_completion_images
(null)
native_tokens_reasoning
40525
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
0.0204942
router
(null)
user_agent
"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer
(null)
request_id
"req-1791469415-vMbTq5k72DbjjRbkCmtu"
session_id
(null)
preset_id
(null)
api_type
"completions"
id
"gen-1791469415-Nw1oF3RwrbkzoW4ONqhs"
upstream_id
"msg_011CfpvQ5mMZ1ttDF5ZvxBSJ"
provider_responses
0
endpoint_id
"b6cdf493-3a61-441f-a134-e7944fddb980"
id
"msg_011CfpvQ5mMZ1ttDF5ZvxBSJ"
is_byok
false
latency
841
model_permaslug
"anthropic/claude-haiku-5.5-20261007"
provider_name
"Claude Platform on AWS"
status
200
total_cost
0.0204942
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
21
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10
10
10
11
10
12
10
13
10
14
10
15
10
16
10
17
10
18
10
19
10
20
10