Try It Yourself

๐Ÿš€ How to run FM-Agent
  1. Paste API Key โ€” Use OpenRouter API key. It would be better if it has access to Claude models, because OpenCode used by FM-Agent may potentially access them.
  2. Enter Model โ€” We highly recommend using Claude Opus 4.6/4.7 or Claude Sonnet 4.6. Other models may not work well due to weaker reasoning capability.
  3. Upload Code โ€” Upload the codebase archive (.zip, .tar.gz, or .tar), or paste a GitHub repository URL to download code directly.
  4. Run โ€” Click to start reasoning about the correctness of the code. You can see progress below.
  5. Stop task โ€” Click to abort the current task.
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Warning: Results are significantly affected by model capability. Weaker models may produce hallucinations. We strongly recommend using Claude Opus 4.6/4.7 or Claude Sonnet 4.6 for reliable results.
๐Ÿ“Œ Before You Start โ€” Please Read
  • Registration: You can run FM-Agent without registering. But if you want to revisit and download historical results at any time, creating an account is recommended.
  • Time: FM-Agent may take a long time. Pauses between updates are normal โ€” the LLM is reasoning about your code. Thank you for your patience :)
  • Dependencies: FM-Agent generates test cases to reproduce identified bugs, which may require specific dependencies. The servers of the service provide
    basic environments for some programming languages.
    Rust 1.95.0 ยท  GCC (C) 14.2.0 ยท  G++ (C++) 14.2.0 ยท  Python 3.11.15 ยท  Java 21.0.10 (JDK+JRE) ยท  Go 1.24.4 ยท  Node.js 20.19.2 ยท  TypeScript 6.0.3 ยท  Bun 1.3.12 ยท  OpenCode 1.4.8
    If you need unsupported software or hardware, we recommend downloading the source code and running it locally.
  • Cost: FM-Agent calls LLMs using your API key. The cost depends on the model and codebase size. You can monitor the cost in real time below, which is calculated by querying the OpenRouter API. If you use the same API key for other tasks at the same time, the displayed cost will include all usage under that key and may not reflect the actual cost for this task alone.
  • Privacy: Your uploaded code is processed in an isolated container and automatically deleted after the analysis completes. We do not store or share your source code.
1 Upload
2 Analyzing
3 Done
anthropic/claude-sonnet-4.6 ▼
OpenRouter Cost (USD) since Task Started
Querying OpenRouter via API Key
$0.0000
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Drop your archive here
or browse files
Supported: .zip  ยท  .tar.gz  ยท  .tar