Run: 2026-02-20-01KHY8FKZKVEMK31Z588FV6NP8

Run Details

Model:
Grok 4.1 Fast
Test:
Data extraction
Scenario:
What instrument does Lucy play?
Duration:
4.2s
Cost:
$0.000164
Provider:
xAI

Evaluation summary

Score Evaluator
Details Link
Fail Matches text (details)
Pass Matches Regex (details)
no eval Overall

Model input

User/Human
What instrument does Lucy play based on the following text? Only return the instrument, nothing else. In the school band, there are four instruments: drums, bass, flute, trumped. John plays the drums, Mary plays the flute, and Pete plays the trumpet. Lucy doesn't play a wind instrument.

Model response

AI
**bass**
created_at"2026-02-20T19:30:01.341Z" 2/20/2026, 7:30:01 PM
model"x-ai/grok-4.1-fast"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1581
moderation_latency(null)
generation_time4147
tokens_prompt75
tokens_completion33
native_tokens_prompt217
native_tokens_completion286
native_tokens_completion_images0
native_tokens_reasoning283
native_tokens_cached151
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"
usage0.00016375
router(null)
provider_responses
0
endpoint_id"9821aa0e-dce3-4c27-9716-161359123d0b"
id"2809591c-2276-2098-c6a8-c5dc43d361ef"
is_byokfalse
latency1330
model_permaslug"x-ai/grok-4.1-fast"
provider_name"xAI"
status200
api_type"completions"
id"gen-1771615801-ChZnwckCKLDW0n9BZN9t"
upstream_id"2809591c-2276-2098-c6a8-c5dc43d361ef"
total_cost0.00016375
cache_discount0.00002265
upstream_inference_cost0
provider_name"xAI"

Evaluation details

Result Evaluator Details Meta Data
Fail Matches text
Case insensitive: bass
 n/a
Pass Matches Regex
/\bbass\b/i
 n/a
no eval