SWE-agent scaffold achieves 79.2% on SWE-bench Verified with Opus 4.5, leading all open-source scaffolds. Also created mini-swe-agent (100 lines, >74% SWE-bench).
SWE-agent
stalePrinceton NLP's benchmark-driven software engineering agent. Academic origin, strong SWE-bench Verified results (79.2%). Last release v1.1.0 was 2025-05-22 — 10 months stale as of 2026-03-19. Best treated as a research reference, not a production tool.
Where it wins
Benchmark-native story
Clear issue-solving shape
Strong technical credibility
Where to be skeptical
Narrower than OpenHands for broad factory workflows
Less about continuous loops than Ralph
Editorial verdict
Research/academic reference only. Princeton pedigree and 79.2% SWE-bench Verified on Opus 4.5 scaffold give it strong benchmark credibility. But no release in 10 months (last: v1.1.0, 2025-05-22) puts it outside the production cadence of all active tools. Use as a benchmark scaffold reference, not as a production coding CLI.
Source
Related
Coding CLIs / Code Agents
Benchmark research, academic reference, issue-level repair evaluation
Teams of Agents / Multi-Agent Orchestration
Issue-level repair with strong academic benchmark credibility

Claude Code
98Anthropic's official agentic coding CLI. v2.1.81 (Mar 20) shipped `--bare`, smarter worktree resume, and improved MCP OAuth while the repo crossed 82,204 stars and logged ~14 commits/week across 10+ maintainers. Terminal-native, tool-use-driven, with deep file system + shell access, #1 SWE-bench Pro standardized (45.89%), ~4% of GitHub public commits (SemiAnalysis), $2.5B annualized revenue. 8M+ npm weekly downloads. Opus 4.6 with 1M context.
LangGraph
95#1 Python agent framework by production evidence — 40.2M PyPI downloads/month, Fortune 500 deployments (LinkedIn, Uber, Replit, Elastic, Klarna, Cloudflare, Coinbase), ~400 LangGraph Platform companies, LangSmith rated best-in-class observability. Stable v1.x API, model-agnostic, MCP support.
Pydantic AI
95#3 Python agent framework by downloads — 15.6M PyPI/month. Built by the Pydantic team. Runtime type enforcement is a genuine differentiator no other framework offers. V1 shipped with Temporal integration for durable execution and Logfire observability. Emerging pattern: 'Pydantic AI for agent logic, LangGraph for orchestration' (ZenML).
AutoGen (Microsoft)
95⚠️ MAINTENANCE MODE — Microsoft officially confirmed bug fixes and security patches only, no new features (VentureBeat 2026-02-19). 55.9K stars but only 1.57M PyPI/month — DL/star ratio of 28, the most inflated among active frameworks. Being replaced by Microsoft Agent Framework (AutoGen + Semantic Kernel merge, GA targeted ~Q2 2026). Teams on AutoGen should plan migration.
Public evidence
Radically simplified version — 100 lines, no huge configs. Matches full SWE-agent performance. Shows the scaffold can be minimal.
Raw GitHub source
GitHub README peek
Constrained peek so you can sanity-check the source material without leaving the site.
[!warning] Most of our current development effort is on mini-swe-agent, which has superseded SWE-agent. It matches the performance performance of SWE-agent, while being much simpler. See the FAQ for more details about the differences. Our general recommendation is to use mini-SWE-agent instead of SWE-agent going forward.
SWE-agent enables your language model of choice (e.g. GPT-4o or Claude Sonnet 4) to autonomously use tools to fix issues in real GitHub repositories, find cybersecurity vulnerabilities, or perform any custom task.
- ✅ State of the art on SWE-bench among open-source projects
- ✅ Free-flowing & generalizable: Leaves maximal agency to the LM
- ✅ Configurable & fully documented: Governed by a single
yamlfile - ✅ Made for research: Simple & hackable by design
SWE-agent is built and maintained by researchers from Princeton University and Stanford University.
📣 News
- July 24: Mini-SWE-Agent achieves 65% on SWE-bench verified in 100 lines of python!
- May 2: SWE-agent-LM-32b achieves open-weights SOTA on SWE-bench
- Feb 28: SWE-agent 1.0 + Claude 3.7 is SoTA on SWE-Bench full
- Feb 25: SWE-agent 1.0 + Claude 3.7 is SoTA on SWE-bench verified
- Feb 13: Releasing SWE-agent 1.0: SoTA on SWE-bench light & tons of new features
- Dec 7: An interview with the SWE-agent & SWE-bench team
🚀 Get started!
Read our documentation to learn more:
- Installation
- Hello world from the command line
- Benchmarking on SWE-bench
- Frequently Asked Questions
SWE-agent for offensive cybersecurity (EnIGMA) <a name="enigma"></a>
<img src="https://github.com/user-attachments/assets/84599168-11a7-4776-8a49-33dbf0758bb2" height="80px"></img>
SWE-agent: EnIGMA is a mode for solving offensive cybersecurity (capture the flag) challenges. EnIGMA achieves state-of-the-art results on multiple cybersecurity benchmarks (see leaderboard). Please use SWE-agent 0.7 while we update EnIGMA for 1.0.
In addition, you might be interested in our other projects:
<div align="center"> <a href="https://github.com/SWE-agent/mini-SWE-agent"><img src="https://raw.githubusercontent.com/SWE-agent/SWE-agent/main/docs/assets/mini_logo_text_below.svg" alt="Mini-SWE-Agent" height="120px"></a> <a href="https://github.com/SWE-agent/SWE-ReX"><img src="https://raw.githubusercontent.com/SWE-agent/SWE-agent/main/docs/assets/swerex_logo_text_below.svg" alt="SWE-ReX" height="120px"></a> <a href="https://github.com/SWE-bench/SWE-bench"><img src="https://raw.githubusercontent.com/SWE-agent/SWE-agent/main/docs/assets/swebench_logo_text_below.svg" alt="SWE-bench" height="120px"></a> <!-- <a href="https://github.com/SWE-agent/SWE-agent"><img src="https://raw.githubusercontent.com/SWE-agent/SWE-agent/main/docs/assets/sweagent_logo_text_below.svg" alt="SWE-agent" height="120px"></a> --> <a href="https://github.com/SWE-bench/SWE-smith"><img src="https://raw.githubusercontent.com/SWE-agent/SWE-agent/main/docs/assets/swesmith_logo_text_below.svg" alt="SWE-smith" height="120px"></a> <a href="https://github.com/SWE-bench/sb-cli"><img src="https://raw.githubusercontent.com/SWE-agent/SWE-agent/main/docs/assets/sbcli_logo_text_below.svg" alt="sb-cli" height="120px"></a> </div>Contributions <a name="contributions"></a>
If you'd like to contribute to the codebase, we welcome issues and pull requests! For larger code changes, we always encourage discussion in issues first.
Citation & contact <a name="citation"></a>
SWE-agent is an academic project started at Princeton University by John Yang*, Carlos E. Jimenez*, Alexander Wettig, Kilian Lieret, Shunyu Yao, Karthik Narasimhan, and Ofir Press. Contact person: John Yang, Carlos E. Jimenez, and Kilian Lieret (Email: johnby@stanford.edu, carlosej@cs.princeton.edu, kl5675@princeton.edu).
If you found this work helpful, please consider citing it using the following:
<details> <summary> SWE-agent citation</summary>@inproceedings{yang2024sweagent,
title={{SWE}-agent: Agent-Computer Interfaces Enable Automated Software Engineering},
author={John Yang and Carlos E Jimenez and Alexander Wettig and Kilian Lieret and Shunyu Yao and Karthik R Narasimhan and Ofir Press},
booktitle={The Thirty-eighth Annual Conference on Neural Information Processing Systems},
year={2024},
url={https://arxiv.org/abs/2405.15793}
}
</details>
If you used the summarizer, interactive commands or the offensive cybersecurity capabilities in SWE-agent, please also consider citing:
<details> <summary>EnIGMA citation</summary>@misc{abramovich2024enigmaenhancedinteractivegenerative,
title={EnIGMA: Enhanced Interactive Generative Model Agent for CTF Challenges},
author={Talor Abramovich and Meet Udeshi and Minghao Shao and Kilian Lieret and Haoran Xi and Kimberly Milner and Sofija Jancheska and John Yang and Carlos E. Jimenez and Farshad Khorrami and Prashanth Krishnamurthy and Brendan Dolan-Gavitt and Muhammad Shafique and Karthik Narasimhan and Ramesh Karri and Ofir Press},
year={2024},
eprint={2409.16165},
archivePrefix={arXiv},
primaryClass={cs.AI},
url={https://arxiv.org/abs/2409.16165},
}
</details>
🪪 License <a name="license"></a>
MIT. Check LICENSE.