Run: 2026-03-18-01KM084X7HER5HF8G6XJC6P8V1

Run Details

Model:
GPT-5.4 Nano (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
3.0s
Cost:
$0.000627
Provider:
OpenAI

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
Night settled over Briarford Manor. Rain tapped locked library door. Detective Lila Hart entered quietly. She found Sir Alton collapsed. Candles flickered beneath shattered portrait. A silver letter lay nearby. Servants whispered, fearing her questions. The clock struck, then stopped. Lila studied fingerprints in ash. Someone had planned this carefully.
created_at"2026-03-18T10:34:02.878Z" 3/18/2026, 10:34:02 AM
model"openai/gpt-5.4-nano-20260317"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2791
moderation_latency(null)
generation_time2902
tokens_prompt46
tokens_completion100
native_tokens_prompt41
native_tokens_completion495
native_tokens_completion_images0
native_tokens_reasoning409
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"completed"
usage0.00062695
router(null)
provider_responses
0
endpoint_id"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id"resp_0d66c4992d69eaa50169ba7f9af88c8194b68dbf86daeaee9b"
is_byokfalse
latency181
model_permaslug"openai/gpt-5.4-nano-20260317"
provider_name"OpenAI"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.14.0; linux; x64))"
http_referer(null)
api_type"completions"
id"gen-1773830042-6oTEvXjfiMF26z9U5GXQ"
upstream_id"resp_0d66c4992d69eaa50169ba7f9af88c8194b68dbf86daeaee9b"
total_cost0.00062695
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
05
15
25
35
45
55
65
75
85
95