Run: 2026-10-09-01M4FXJM3TG24D4SBTWDC47PM2

Run Details

Model:
Claude Haiku 5.5 (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
8.7s
Cost:
$0.000717
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 struck the manor windows. Detective Mara Voss arrived late. The corpse sprawled beneath chandeliers. Lord Ashworth had been poisoned. Nobody in the household wept. Muddy footprints led toward library. A broken teacup sat nearby. Mara knelt beside the victim. Someone had cleaned the cup. Inspector Dell entered, grimly silent. Then the lights went out. Somewhere above, a door slammed. Footsteps echoed across cold marble. Mara reached for her revolver.
created_at"2026-10-09T08:48:18.049Z" 10/9/2026, 8:48:18 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2207
moderation_latency(null)
generation_time8644
tokens_prompt46
tokens_completion391
native_tokens_prompt62
native_tokens_completion1421
native_tokens_completion_images(null)
native_tokens_reasoning1229
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"
usage0.0007167
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791535698-vOKrMTOlCGdr689aVNrB"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791535698-5LHj7i3eyBaRkHcX811l"
upstream_id"msg_011CfrNe4wumKNJPkwyhZ6wm"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfrNe4wumKNJPkwyhZ6wm"
is_byokfalse
latency653
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0007167
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
sentences14
wordCounts
05
15
25
35
45
55
65
75
85
95
105
115
125
135