'Eval' (short for 'evaluation') in AI work means a structured test that measures how well a model performs at a task — answering questions correctly, refusing harmful prompts, writing code that runs. 'I ran an eval' = 'I tested the model on a benchmark'. If your young adult uses the term, they are doing AI engineering or research. Standard technical vocabulary; harmless.
eval
Short for "evaluation." A benchmark or test suite used to measure how well an AI model performs.
iːˈvælCoined ~20232020sGen AlphatrendingCurrent312 viewsLast reviewed Jun 29, 2026＋ Add a definition
Seen in the wild
5 citations · last seen May 2026
Etymology timeline
Born ~2023 · 1 year of recorded useSeen in the wild
BlueskyMay 2026
I'm sitting here shaking my head. She and the other adults should be required to have a psych eval.
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BlueskyMay 2026
When Alyx fails in production, we turn the trace into a test case. The trace gives us the repro, the expected behavior becomes the spec, and the eval tells us whether the fix worked.
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BlueskyMay 2026
not to mention, taking a block generating card inherently means you are *not* taking an attack or advantage/combo piece, unless you get a particularly good block, which is rarer than getting an attack that's maybe sli…
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BlueskyMay 2026
Psych eval, of course. Now what about some criminal charges?? Normalize accountability. Unruly passengers have become a significant crisis in 2024–25, with one incident reported per 395 flights globally. metro.co.u…
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BlueskyMay 2026
Are the kids supposed to take our minds off him being an accused child rapist - the childrens parents are delusional need a psych eval placing their kids so close to that maniac!
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Definitions
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+489100%
#1·Apr 24, 2026Global
Short for "evaluation." A benchmark or test suite used to measure how well an AI model performs. "Write better evals" is a common 2025 refrain.
See it in action
“When Alyx fails in production, we turn the trace into a test case. The trace gives us the repro, the expected behavior becomes the spec, and the eval tells us whether the fix worked.”
"Our eval suite catches regressions better than any Q&A meeting."
Origin: AI / developer industry term, 2023–2025.
For parents
'Eval' (short for 'evaluation') in AI work means a structured test that measures how well a model performs at a task — answering questions correctly, refusing harmful prompts, writing code that runs. 'I ran an eval' = 'I tested the model on a benchmark'. If your young adult uses the term, they are doing AI engineering or research. Standard technical vocabulary; harmless.
For ESL learners
'Eval' (short for 'evaluation') in AI/ML engineering is a structured test or benchmark that measures a model's performance on specific tasks (factual accuracy, code generation, refusal behaviour, reasoning). Used as a count noun ('run an eval', 'design new evals'). Register: technical, AI/ML industry. In academic writing prefer the full 'evaluation' or 'benchmark'. A common learner mistake is to confuse it with the JavaScript/Python eval() function; the slang noun and the programming function are distinct.
Cluster: ai_specific
Heard in the wild
“I'm sitting here shaking my head. She and the other adults should be required to have a psych eval.”
— Bluesky· May 2026“When Alyx fails in production, we turn the trace into a test case. The trace gives us the repro, the expected behavior becomes the spec, and the eval tells us whether the fix worked.”
— Bluesky· May 2026“not to mention, taking a block generating card inherently means you are *not* taking an attack or advantage/combo piece, unless you get a particularly good block, which is rarer than getting an attack that's maybe slightly "worse" on eval, but is markedly better than a strike.”
— Bluesky· May 2026“Psych eval, of course. Now what about some criminal charges?? Normalize accountability. Unruly passengers have become a significant crisis in 2024–25, with one incident reported per 395 flights globally. metro.co.uk/2026/05/03/f...”
— Bluesky· May 2026“Are the kids supposed to take our minds off him being an accused child rapist - the childrens parents are delusional need a psych eval placing their kids so close to that maniac!”
— Bluesky· May 2026
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Show 2 more dictionary-style senses (imported)
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#2·May 2, 2026Global
Relating to time or duration.
Source: Wiktionary (CC BY-SA 4.0)
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Global
#3·May 2, 2026Global
To evaluate (or execute) source code held in a string during run time.
Source: Wiktionary (CC BY-SA 4.0)
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For specific readers
Why is this section here?
Slang is read by different audiences for very different reasons. The For parents view re-explains the term in plain, non-judgemental language so a caregiver can understand what their child means without needing the surrounding subculture. The For English learners view focuses on register (when it's safe to use), formal alternatives, and common mistakes — what a textbook won't teach you.
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Semantically related
- evals73%
Plural of eval. The test suite — automated checks, golden-set comparisons, A/B preference — used to measure LLM output quality before shipping.
- evals check69%
An evals check is a moment of honest, structured self-assessment or peer review — borrowed directly from the AI world where 'evals' (evaluations) are the benchmarks you run to see how well a model is actually performing versus how well you think it is. In internet slang, running an evals check on someone — or yourself — means cutting through the vibes and actually measuring: are you performing, or just presenting the impression of performance? The concept is spreading from tech discourse into general use, especially in productivity and career contexts where people are tired of fake metrics.
- eval check69%
An eval check is a quick but pointed assessment of someone's performance, reasoning, or output — running the numbers on how they actually did rather than how they think they did. Borrowed from AI/machine learning culture where 'eval' means evaluation benchmarking, it migrated into everyday language as slang for any blunt, honest appraisal. Did your plan work? Someone's running an eval check. Did you actually ace that test? Your friends are doing an eval check on your confidence. Cuts through self-assessment bias with refreshing directness.
- eval mode67%
The headspace you enter when you stop vibing and start measuring. Eval mode is when someone switches from casual participation to active, clinical judgment — sizing up people, situations, or moves with quiet intensity. Common in dating contexts, friend groups, and competitive spaces where someone is clearly taking mental notes without announcing it. The vibe shifts, the jokes slow down, and suddenly every action feels like a test you didn't know you were taking.