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| Pricing | Free | Free |
| Capabilities | 6 decomposed | 13 decomposed |
| Times Matched | 0 | 0 |
Evaluates language model factuality by presenting short, fact-seeking questions with objectively verifiable answers that admit no reasonable interpretation variance. The benchmark uses a curated dataset of questions where correctness can be deterministically assessed without subjective judgment, enabling precise measurement of hallucination rates versus accurate factual retrieval across model families and scales.
Unique: Focuses specifically on unambiguous factual questions where ground truth is objectively determinable, eliminating subjective evaluation variance that plagues other factuality benchmarks; uses OpenAI's curation process to ensure questions have single correct answers with no reasonable interpretation ambiguity
vs alternatives: More precise than general QA benchmarks (SQuAD, TriviaQA) because it explicitly filters for unambiguous answers, making hallucination detection clearer and more actionable than benchmarks that tolerate multiple valid responses
Provides a standardized measurement methodology for quantifying the frequency and severity of factual hallucinations across different model sizes, architectures, and training approaches. The benchmark enables comparative analysis of how hallucination rates scale with model capacity, training data, and fine-tuning techniques, using consistent evaluation criteria across all tested variants.
Unique: Provides standardized hallucination quantification methodology that enables direct comparison across model families and scales by using consistent unambiguous questions, rather than ad-hoc evaluation approaches that vary by researcher or organization
vs alternatives: More comparable across models than internal evaluation frameworks because it uses a public, fixed benchmark rather than proprietary datasets, enabling reproducible hallucination rate reporting across OpenAI and competing model providers
Provides a curated dataset of factual questions paired with verified ground truth answers, enabling deterministic evaluation of model outputs against objectively correct responses. The validation approach uses human curation and fact-checking to ensure ground truth accuracy, supporting automated scoring of model responses without subjective interpretation.
Unique: Uses human-curated ground truth with explicit fact-checking to ensure answer correctness, rather than relying on crowdsourced labels or automatic extraction, reducing noise in factuality evaluation
vs alternatives: More reliable than crowdsourced QA benchmarks (like SQuAD) because answers are verified for factual accuracy rather than just extracted from source documents, eliminating cases where the source itself contains errors
Provides a standardized evaluation framework for comparing factuality performance across different language models, enabling side-by-side analysis of accuracy metrics, hallucination rates, and failure patterns. The framework supports batch evaluation of multiple models against the same question set, producing comparative metrics that highlight relative strengths and weaknesses in factual reasoning.
Unique: Enables standardized comparison across models from different providers (OpenAI, Anthropic, Google, open-source) using identical questions and evaluation criteria, rather than relying on each provider's proprietary benchmarks
vs alternatives: More actionable than individual model evaluations because it provides relative performance data, helping teams make concrete model selection decisions rather than just understanding absolute accuracy numbers
Provides a curated dataset of short, focused factual questions designed to isolate factuality measurement from reasoning complexity, comprehension difficulty, or multi-hop inference. The curation process selects questions where a single, unambiguous factual answer exists, enabling clean measurement of whether models can retrieve or generate correct facts without confounding variables.
Unique: Explicitly curates for short-form questions with unambiguous answers to isolate factuality measurement, rather than using general QA datasets that mix factuality with reasoning, comprehension, and inference complexity
vs alternatives: Cleaner factuality signal than general QA benchmarks because it removes confounding variables like reasoning complexity, enabling precise attribution of errors to hallucination rather than reasoning failures
Enables systematic analysis of hallucination patterns and failure modes by categorizing incorrect model responses, identifying which types of facts models most frequently hallucinate, and revealing systematic biases in factual generation. The analysis approach examines error patterns across question categories, model sizes, and architectures to understand root causes of hallucinations.
Unique: Provides structured data enabling systematic error analysis across models and question types, rather than anecdotal hallucination examples, supporting quantitative understanding of failure modes
vs alternatives: More actionable than qualitative hallucination examples because it reveals patterns and distributions, enabling targeted improvements rather than general factuality optimization
Provides a standardized evaluation framework for code generation models that accepts generated code in 17 programming languages (C, C++, C#, Java, Kotlin, Go, Rust, Python, Ruby, PHP, JavaScript, Perl, Haskell, OCaml, Scala, D, Pascal) and validates correctness through actual execution against unit tests via the ExecEval Docker-based execution engine. Uses a centralized problem definition model with src_uid foreign keys linking generated code to shared problem descriptions and unittest_db.json, enabling consistent evaluation across language variants of the same problem.
Unique: Combines 25M training examples across 7,500 unique problems with an execution-based evaluation pipeline (ExecEval) that actually runs generated code in Docker containers against unit tests, rather than relying on static analysis or string matching. The src_uid linking system creates a normalized data model where problem descriptions and tests are stored once and referenced by all language variants, eliminating duplication and ensuring consistency.
vs alternatives: Larger scale (25M examples vs typical 10-100K) and true execution-based validation across more languages (17 vs 4-6) than HumanEval or CodeXGLUE, with explicit support for code translation and repair tasks beyond generation.
Implements a foreign key linking system where all task-specific datasets (program synthesis, code translation, APR, retrieval) reference shared problem definitions via src_uid identifiers. Problem descriptions and unit tests are stored once in centralized problem_descriptions.jsonl and unittest_db.json files, then linked by src_uid to avoid duplication. The Hugging Face datasets API automatically resolves these links during data loading, returning enriched DatasetDict objects with problem context pre-joined to task examples.
Unique: Uses a normalized relational data model (src_uid as foreign key) for a code benchmark, treating problem definitions as a separate entity layer rather than embedding them in each task dataset. This is more sophisticated than typical flat-file benchmark structures and enables consistent multi-task evaluation on identical problems.
xCodeEval scores higher at 67/100 vs SimpleQA at 62/100.
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vs alternatives: More efficient than duplicating problem descriptions across 7 task datasets (reduces storage by ~30-40%), and enables automatic link resolution via Hugging Face API unlike manual CSV joins in CodeXGLUE or HumanEval variants.
Provides a Python API for loading xCodeEval datasets from Hugging Face Hub (NTU-NLP-sg/xCodeEval) with automatic src_uid-based linking between task datasets and shared problem definitions. The datasets library handles data downloading, caching, and streaming, while the xCodeEval integration automatically joins task examples with problem_descriptions.jsonl and unittest_db.json using src_uid foreign keys. Returns DatasetDict objects with enriched examples ready for model training or evaluation.
Unique: Integrates xCodeEval with Hugging Face datasets library, providing automatic src_uid resolution and streaming support. Treats data loading as a first-class concern with built-in linking logic, rather than requiring manual JSON parsing.
vs alternatives: More convenient than manual Git LFS downloads because it handles caching and automatic linking, and integrates seamlessly with Hugging Face training pipelines vs custom data loaders.
Provides an alternative data access method using Git LFS for users who prefer direct file access or need selective dataset downloads. Supports cloning the repository with LFS disabled, then pulling specific task files or problem definitions on demand. Useful for custom processing pipelines or environments where Python/Hugging Face is not available, though requires manual src_uid linking to join task examples with problem definitions.
Unique: Provides Git LFS-based alternative to Hugging Face API, enabling direct file access and selective downloads. Requires manual src_uid linking but offers more control over data access patterns.
vs alternatives: More flexible than Hugging Face API for selective downloads and custom pipelines, but requires more manual work for src_uid linking and lacks automatic caching/streaming.
Implements a standardized three-phase evaluation pipeline (Phase 1: Generation, Phase 2: Execution, Phase 3: Metrics) that applies consistently across all 7 tasks (program synthesis, code translation, APR, tag classification, code compilation, NL-code retrieval, code-code retrieval). Phase 1 generates or retrieves code, Phase 2 executes it via ExecEval or computes retrieval metrics, and Phase 3 aggregates results into pass@k, MRR, NDCG, or other task-specific metrics. Enables direct comparison of model performance across tasks.
Unique: Defines a unified three-phase evaluation pipeline that applies to all 7 tasks, treating generation, execution, and metric computation as separate concerns. Enables consistent evaluation methodology across diverse task types (generation, translation, retrieval, classification).
vs alternatives: More comprehensive than task-specific evaluation scripts because it provides a unified framework for all 7 tasks, and enables direct comparison of model performance across different task types.
Evaluates code generation models on the program synthesis task by accepting natural language problem descriptions and generating code solutions in any of 17 languages. The evaluation pipeline (Phase 1: Generation, Phase 2: Execution, Phase 3: Metrics) runs generated code against unit tests via ExecEval, computing pass@k metrics (pass@1, pass@10, etc.) that measure the probability of finding a correct solution within k samples. Supports both single-solution and multi-sample evaluation modes for assessing model reliability.
Unique: Implements a three-phase evaluation pipeline (Generation → Execution → Metrics) with explicit pass@k computation that measures the probability of finding a correct solution within k attempts, rather than just binary pass/fail. Supports multi-sample evaluation across 17 languages with language-specific compiler configurations and timeout handling.
vs alternatives: More rigorous than HumanEval's simple pass@k because it handles language-specific compilation errors and timeouts explicitly, and scales to 25M training examples vs HumanEval's 164 problems.
Evaluates code translation models by accepting source code in one language and generated translations in a target language, then validating functional equivalence through execution against shared unit tests. The translation evaluation pipeline compiles and executes both source and translated code against the same unittest_db.json test cases, comparing outputs to detect translation errors. Supports all 17 language pairs (though not all pairs may have training data) and uses language-specific compiler mappings to handle syntax differences.
Unique: Validates code translation by executing both source and target code against identical unit tests and comparing outputs, ensuring functional equivalence rather than syntactic similarity. Uses language-specific compiler mappings to handle the complexity of 17 different compilation environments and their idiosyncrasies.
vs alternatives: More rigorous than BLEU-score-based translation metrics because it validates actual functional correctness through execution, and covers more language pairs (17 vs typical 2-4) with explicit compiler integration.
Evaluates program repair models by providing buggy code snippets and expecting corrected versions that pass unit tests. The APR evaluation pipeline executes repaired code against unittest_db.json test cases, measuring whether the repair successfully fixes the bug without introducing new failures. Supports repairs across all 17 languages and uses the same execution-based validation as program synthesis, enabling direct comparison of repair quality.
Unique: Treats program repair as an executable task where success is measured by unit test passage, rather than syntactic similarity to reference repairs. Integrates with the same ExecEval pipeline as program synthesis, enabling direct performance comparison between generation and repair models.
vs alternatives: More comprehensive than traditional APR benchmarks (Defects4J, QuixBugs) because it covers 17 languages and 7,500 problems vs 395 Java bugs, and uses consistent execution-based metrics across all repair types.
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