Datasets:

cognitivedaniel
/

daniel-benchmark-v1

instance_id string	repo string	language string	issue_title string	issue_url string	source string	daniel_result string	daniel_pr_url string	daniel_time_s int64	daniel_cost_usd float64	devin_result string	devin_time_s int64	devin_cost_usd float64	graded_by string	benchmark_round int64	notes string
python-humanize-346	python-humanize/humanize	Python	intword() returns wrong value for huge numbers	https://github.com/python-humanize/humanize/issues/346	cognitivedaniel.com/devin-alternative	pass	https://github.com/2badagoldman/humanize/pull/1	113	0.25	pass	114	0.74	maintainer_hidden_tests	3	null
more-itertools-1284	more-itertools/more-itertools	Python	bucket() invents phantom keys for missing elements	https://github.com/more-itertools/more-itertools/issues/1284	cognitivedaniel.com/devin-alternative	pass	https://github.com/2badagoldman/more-itertools/pull/1	106	0.15	pass	96	0.71	maintainer_hidden_tests	3	null
jshttp-mime-types-140	jshttp/mime-types	JavaScript	.mp4 extension resolves to the wrong MIME type	https://github.com/jshttp/mime-types/issues/140	cognitivedaniel.com/devin-alternative	pass	https://github.com/2badagoldman/mime-types/pull/1	66	0.16	pass	106	0.84	maintainer_hidden_tests	3	null
sindresorhus-pretty-bytes-91	sindresorhus/pretty-bytes	JavaScript	Rounding error at unit boundaries (e.g. 999.95 bytes)	https://github.com/sindresorhus/pretty-bytes/issues/91	cognitivedaniel.com/devin-alternative	pass	https://github.com/2badagoldman/pretty-bytes/pull/6	126	0.33	pass	180	0.93	maintainer_hidden_tests	4	Round 4 used after engine fix for all-range requirement checking
sindresorhus-camelcase-95	sindresorhus/camelcase	JavaScript	Acronym plurals like IDs not handled correctly	https://github.com/sindresorhus/camelcase/issues/95	cognitivedaniel.com/devin-alternative	pass	https://github.com/2badagoldman/camelcase/pull/1	196	0.37	pass	159	0.95	maintainer_hidden_tests	3	null
pillarjs-path-to-regexp-444	pillarjs/path-to-regexp	JavaScript	Empty parameter name accepted, causes incorrect routing	https://github.com/pillarjs/path-to-regexp/issues/444	cognitivedaniel.com/devin-alternative	pass	https://github.com/2badagoldman/path-to-regexp/pull/1	146	0.19	pass	77	0.74	maintainer_hidden_tests	3	null

YAML Metadata Warning:The task_categories "text2text-generation" is not in the official list: text-classification, token-classification, table-question-answering, question-answering, zero-shot-classification, translation, summarization, feature-extraction, text-generation, fill-mask, sentence-similarity, text-to-speech, text-to-audio, automatic-speech-recognition, audio-to-audio, audio-classification, audio-text-to-text, voice-activity-detection, depth-estimation, image-classification, object-detection, image-segmentation, text-to-image, image-to-text, image-to-image, image-to-video, unconditional-image-generation, video-classification, reinforcement-learning, robotics, tabular-classification, tabular-regression, tabular-to-text, table-to-text, multiple-choice, text-ranking, text-retrieval, time-series-forecasting, text-to-video, image-text-to-text, image-text-to-image, image-text-to-video, visual-question-answering, document-question-answering, zero-shot-image-classification, graph-ml, mask-generation, zero-shot-object-detection, text-to-3d, image-to-3d, image-feature-extraction, video-text-to-text, keypoint-detection, visual-document-retrieval, any-to-any, video-to-video, other

Daniel Benchmark v1

A public head-to-head benchmark comparing Daniel (Cognitive AI) and Devin (Cognition AI) on 6 real bugs from widely used open-source libraries.

Key results

Pass rate: Both agents 6/6 (100%)
Daniel cost: $1.45 total ($0.24/bug)
Devin cost: $4.91 total ($0.82/bug)
Daniel is 70% cheaper at equal accuracy

All pull requests are public. Graded by each project's own hidden test suite — neither agent saw the tests.

Dataset fields

Field	Type	Description
`instance_id`	string	Unique identifier for the bug instance
`repo`	string	`owner/repo` on GitHub
`language`	string	Primary language of the repo
`issue_title`	string	The bug description given to both agents
`issue_url`	string	Original GitHub issue URL
`daniel_result`	string	`pass` or `fail`
`daniel_pr_url`	string	Link to Daniel's pull request
`daniel_time_s`	int	Seconds from start to PR opened
`daniel_cost_usd`	float	Claude API cost in USD
`devin_result`	string	`pass` or `fail`
`devin_time_s`	int	Seconds from start to PR opened
`devin_cost_usd`	float	Devin session cost in USD
`graded_by`	string	Always `maintainer_hidden_tests`
`benchmark_round`	int	Iteration number (Daniel ran 4 rounds; table uses best passing round)

Repos tested

python-humanize/humanize — Python
more-itertools/more-itertools — Python
jshttp/mime-types — JavaScript (Express ecosystem)
sindresorhus/pretty-bytes — JavaScript
sindresorhus/camelcase — JavaScript
pillarjs/path-to-regexp — JavaScript (Express ecosystem)

Methodology

Picked recent, real bug fixes from widely used libraries
Forked each project at the commit just before the maintainers' own fix
Gave both agents an identical issue-style prompt with no hints about the fix
Graded each PR by overwriting test files with the maintainer versions and running the project's test command
All PRs are public

Upcoming: v2 (10-bug suite)

The next version will include 10 harder bugs from Django, FastAPI, SQLAlchemy, TypeScript, Next.js, Elasticsearch, Kubernetes, Spring Boot, Pandas, and Apache Airflow — testing multi-file and cross-language fixes. Competitors will include OpenHands and SWE-agent in addition to Devin.

Citation

@misc{cognitive-ai-daniel-benchmark-2026,
  title={Daniel Benchmark v1: Autonomous AI Agent Head-to-Head on Real Open-Source Bugs},
  author={Cognitive AI},
  year={2026},
  url={https://huggingface.co/datasets/cognitivedaniel/daniel-benchmark-v1}
}

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