Run: 2026-10-08-01M4D9YY1K4CPCN42WE15JNSC0

Run Details

Model:
Claude Haiku 5.5 (Reasoning, Medium)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
6.7s
Cost:
$0.000597
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 5 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
Rain hammered Blackwood Manor's windows. Detective Eleanor Vance stepped inside. The body lay near fireplace. Crimson stained the Persian rug. Nobody had touched anything yet. Eleanor knelt beside the victim. Lord Harrington's eyes stared upward. A silver letter opener protruded. Someone had wanted him silenced. Behind her, a floorboard creaked. "Don't move," said Inspector Graves. Eleanor did not turn around. Killers rarely knock before entering.
created_at"2026-10-08T08:27:01.05Z" 10/8/2026, 8:27:01 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2302
moderation_latency(null)
generation_time6670
tokens_prompt46
tokens_completion212
native_tokens_prompt62
native_tokens_completion1181
native_tokens_completion_images(null)
native_tokens_reasoning992
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
num_fetches(null)
web_search_engine(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"end_turn"
service_tier"default"
usage0.0005967
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791448021-VT5B1oEoLnDdukwYWKIl"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791448021-ChymEIastd7dsTS4BLEP"
upstream_id"msg_011CfpTD2KnbasJ5DGdXbwPZ"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfpTD2KnbasJ5DGdXbwPZ"
is_byokfalse
latency725
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0005967
cache_discount(null)
upstream_inference_cost0
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
neededCleanfalse
sentences13
wordCounts
05
15
25
35
45
55
65
75
85
95
105
115
125