GEPA

tom@tomrochette.com (Tom Rochette) — Tue, 13 Oct 2026 00:00:00 +0000

GEPA is an MIT-licensed reflective prompt optimizer from the Databricks research lineage that evolves any text parameter (prompts, code, agent architectures, configs) against any metric using genetic-Pareto search over language-model feedback.

Its place in the skills category is the factory floor: where the other columns package, gate, and rank skill markdown, GEPA is the optimizer that can write and rewrite that markdown mechanically, its own documentation recording coding-agent skills learned automatically.

What it is
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A Python library and CLI built on the GEPA paper (arXiv 2507.19457, July 2025), which showed reflective prompt evolution beating grouped reinforcement learning on quality and cost for LLM tasks. You point it at seed prompts, an evaluator (any metric you can call), and a budget; it proposes mutations, runs candidates, keeps the Pareto frontier, and iterates. It optimizes “any text parameter”, so the same loop covers system prompts, DSPy programs, agent instructions, and skill files, and the project documents coding-agent skills it learned automatically. Distribution is PyPI (pip install gepa, v0.1.4, release-tagged July 2026) with a documented site and worked examples.

Status
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Active with an established research record: 6,959 stars, 575 forks, and 142 open issues as of 2026-10-13, created 2025-08-05, pushed 2026-10-12, PyPI at 0.1.4. The launch reached a 92-point Hacker News thread in July 2025, and Databricks’ adoption of GEPA for agent prompt optimization is documented by the vendor’s own engineering blog. The contested part is the evidence: a “Contra DSPy and GEPA” thread and the DSPy community’s methodological argument over GEPA’s comparison baselines are the standing critical sources, so the headline claims deserve a re-run on your own metric before adoption.

Strengths
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Optimizer generality: one loop over any metric and any text artifact, which makes it the missing mechanical layer under every skill and prompt column in this category.
The reflective step uses model reasoning about failures, not blind mutation, so candidate quality stays high and API spend stays bounded.
Pareto-frontier selection keeps candidates that win on different inputs instead of collapsing to one average prompt.
A documented adoption trail: the paper, the Databricks production claim, and an active issue tracker give it a verifiable history.
MIT with a small API surface; you can read the whole search loop in an afternoon.

Cautions
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The comparison-methodology dispute (the Contra thread) is unresolved; GEPA’s reported wins over reinforcement learning and DSPy depend on baseline choices its critics dispute.
Optimizer runs are expensive in evaluator calls: the budget is your model bill, and a bad metric silently optimizes toward the wrong thing.
Version 0.1.x means the API moves; pin or expect churn.
142 open issues against one org’s maintenance bandwidth, and the release cadence (one tag since July 2026) lags the default branch.
It edits text artifacts directly, so run it against versioned files or it will optimize in place.

Pricing
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Free and open source under MIT. There is no hosted tier; optimizer runs consume your own model API budget, which is the whole cost.

Compared to
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SkillOpt: Microsoft’s skill-specific optimizer; GEPA is the general text-parameter optimizer SkillOpt’s job descends from, with more surfaces and less skill-file structure.
Anthropic Agent Skills: the format whose files GEPA can optimize; use the format for packaging, GEPA when the content needs to improve against a metric.
Agent Skills open standard: the interchange spec; GEPA writes artifacts that still need to conform to it before agents load them.

Bottom line
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Recommended for teams with a trustworthy metric and prompt assets that matter enough to optimize mechanically. Not for anyone without an evaluator (GEPA amplifies whatever the metric measures), or for skill distribution problems, which remain the other columns’ job.

Changes
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2026-10-13 - Created.

References
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https://github.com/gepa-ai/gepa - repository, MIT license, stars, push activity, and the any-text-parameter scope as of 2026-10-13
https://arxiv.org/abs/2507.19457 - the GEPA paper grounding the reflective-prompt-evolution and Pareto-selection claims
https://gepa-ai.github.io/gepa/ - the documented API, examples, and the auto-learned coding-agent skills claim
https://pypi.org/project/gepa/ - the PyPI distribution, version 0.1.4 (2026-07-15), MIT
https://news.ycombinator.com/item?id=44744331 - the 92-point July 2025 launch thread
https://news.ycombinator.com/item?id=46331945 - the Contra DSPy and GEPA thread, the standing critical source on the comparison methodology

prompt-optimization on tomrochette.com

GEPA

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prompt-optimization on tomrochette.com

GEPA

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What it is
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Status
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Strengths
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Cautions
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Pricing
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Compared to
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Bottom line
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Changes
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See also
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References
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