APPS (Automated Programming Progress Standard)
DatasetFree10K coding problems across 3 difficulty levels with test suites.
Capabilities6 decomposed
multi-difficulty benchmark evaluation for code generation models
Medium confidenceProvides a stratified dataset of 10,000 coding problems across three difficulty tiers (introductory: 3,639, interview: 5,000, competition: 1,361) sourced from production coding platforms (Codewars, AtCoder, Kattis, Codeforces). Enables systematic evaluation of code generation systems across skill levels by measuring end-to-end performance from natural language problem descriptions to executable code, with each problem paired with comprehensive test suites averaging 21 test cases per problem. The stratification allows researchers to isolate model performance degradation as problem complexity increases.
Stratified difficulty sampling (3,639 intro / 5,000 interview / 1,361 competition) sourced from four production competitive programming platforms with comprehensive test suites (avg 21 tests/problem), enabling fine-grained analysis of model degradation across skill levels — more rigorous than HumanEval's single-difficulty, API-focused problems
More challenging and comprehensive than HumanEval (164 problems, single difficulty) because it requires algorithmic reasoning across three tiers and includes real-world test suites from competitive programming platforms rather than synthetic API-call problems
end-to-end code generation pipeline validation
Medium confidenceValidates the complete pipeline from natural language problem specification to working executable code by requiring generated solutions to pass comprehensive test suites. Each problem includes the problem statement (natural language description), input/output specifications, and 21 test cases on average that cover normal cases, edge cases, and boundary conditions. The dataset structure enforces that models must perform full semantic understanding, algorithmic reasoning, and code synthesis in a single pass without intermediate feedback loops.
Enforces full pipeline validation with comprehensive test suites (avg 21 tests per problem) that cover edge cases and boundary conditions, not just happy-path scenarios — requires models to demonstrate semantic correctness, not just syntactic validity or partial understanding
More rigorous than simple code-completion benchmarks because it requires generated code to pass all test cases, catching semantic errors and edge-case failures that syntax-only validation would miss
difficulty-stratified performance analysis
Medium confidenceEnables comparative analysis of code generation model performance across three discrete difficulty tiers by partitioning the 10,000 problems into introductory (3,639), interview (5,000), and competition (1,361) subsets. Each tier represents increasing algorithmic complexity, allowing researchers to measure performance degradation curves and identify the difficulty threshold where models begin to fail. The stratification is sourced from the original platform classifications (Codewars, AtCoder, Kattis, Codeforces), ensuring consistency with industry-standard problem difficulty ratings.
Provides three discrete, platform-validated difficulty tiers (introductory/interview/competition) with substantial problem counts per tier (3,639/5,000/1,361), enabling statistically meaningful performance degradation analysis across skill levels — most benchmarks lack this stratification or use arbitrary difficulty scoring
Enables difficulty-stratified analysis that HumanEval cannot provide (single difficulty level), allowing researchers to identify the exact capability ceiling of their models rather than just a single aggregate score
comprehensive test suite curation and aggregation
Medium confidenceAggregates test suites from four production competitive programming platforms (Codewars, AtCoder, Kattis, Codeforces) with an average of 21 test cases per problem, covering normal cases, edge cases, boundary conditions, and performance constraints. Test cases are sourced from platform-validated problem sets where human competitors have solved problems, ensuring test quality and coverage. The dataset preserves the original test structure and specifications, allowing evaluation systems to run tests in isolated environments with timeout and resource constraints.
Aggregates test suites from four production competitive programming platforms with platform-validated problem sets and average 21 tests per problem, ensuring test quality is derived from real human-solved problems rather than synthetic or hand-crafted test cases
More comprehensive and realistic than synthetic test suites because tests are sourced from actual competitive programming platforms where human competitors have validated problem correctness and test coverage
cross-platform problem sourcing and normalization
Medium confidenceAggregates 10,000 coding problems from four distinct competitive programming platforms (Codewars, AtCoder, Kattis, Codeforces) and normalizes them into a unified dataset format. Each problem is extracted with its natural language description, input/output specifications, constraints, and associated test cases, then standardized to enable consistent evaluation across platform-specific variations in problem statement style, I/O format, and constraint specification. The normalization process preserves problem semantics while enabling unified evaluation infrastructure.
Aggregates and normalizes problems from four distinct competitive programming platforms (Codewars, AtCoder, Kattis, Codeforces) into a unified format, preserving platform diversity while enabling consistent evaluation — most benchmarks source from a single platform or use synthetic problems
Provides platform diversity that single-source benchmarks lack, reducing evaluation bias and enabling analysis of how code generation models generalize across different problem statement styles and constraint specifications
large-scale benchmark dataset for model training and evaluation
Medium confidenceProvides a dataset of 10,000 coding problems suitable for both training code generation models (via supervised fine-tuning on problem-solution pairs) and evaluating model performance at scale. The dataset size and diversity enable statistical significance in model comparisons and support training of specialized code generation models. Problems span three difficulty levels and multiple algorithmic domains, providing sufficient variety to avoid overfitting to specific problem patterns.
Provides 10,000 problems across three difficulty tiers with comprehensive test suites, enabling both supervised fine-tuning of code generation models and large-scale evaluation with statistical significance — most code generation datasets are either smaller (HumanEval: 164 problems) or lack test suites for rigorous evaluation
Larger and more comprehensive than HumanEval (164 problems) and includes test suites for rigorous evaluation, making it suitable for both training and benchmarking code generation models at production scale
Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.
Related Artifactssharing capabilities
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Home of CodeT5: Open Code LLMs for Code Understanding and Generation
Best For
- ✓ML researchers evaluating code generation models (Codex, GPT-4, Claude, open-source LLMs)
- ✓Teams building code synthesis systems who need standardized evaluation beyond HumanEval
- ✓Academic groups studying algorithmic reasoning in language models
- ✓Companies benchmarking internal code generation tools against public standards
- ✓Code generation model developers who need strict pass/fail evaluation criteria
- ✓Teams building autonomous code synthesis tools that must work without human review
- ✓Researchers studying the gap between syntactic correctness and semantic correctness in LLM outputs
- ✓Organizations evaluating whether code generation is production-ready for their use case
Known Limitations
- ⚠Problems are primarily algorithmic/competitive programming focused — limited coverage of web development, systems programming, or domain-specific code patterns
- ⚠Test suites are deterministic and may not catch all edge cases or performance regressions in generated code
- ⚠No built-in evaluation harness — requires custom infrastructure to run tests, parse outputs, and aggregate metrics
- ⚠Language coverage skewed toward Python (majority of problems) with limited multi-language problem variants
- ⚠Static test cases cannot evaluate code quality attributes like readability, maintainability, or security vulnerabilities
- ⚠Test suites are finite and deterministic — generated code may pass all tests but fail on unseen inputs or have subtle bugs
Requirements
Input / Output
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About
Benchmark of 10,000 coding problems spanning three difficulty levels: introductory (3,639), interview (5,000), and competition (1,361). Problems sourced from Codewars, AtCoder, Kattis, and Codeforces with comprehensive test suites averaging 21 tests per problem. Tests the full pipeline from natural language problem description to working code. More challenging than HumanEval as problems require algorithmic thinking, not just API knowledge. Standard benchmark for evaluating code generation systems.
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