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Anvil
Open-source AI coding agent with per-stage LLM routing
Anvil is an open-source AI coding agent that turns a feature request into a tested pull request. It routes each pipeline stage — clarify, plan, build, test, validate, review, and ship — to the cheapest model that is good enough, across local and cloud LLMs.
Hey Product Hunt 👋
I built Anvil because I was frustrated with how most AI coding tools work today: one vendor, one model, one subscription, and very little control over where your tokens go.
But coding agents are not one task. They are a pipeline.
Planning needs strong reasoning.
Building often needs good context more than a frontier model.
Testing and validation can often run locally.
Review is where premium judgment matters again.
So Anvil routes each stage of the coding pipeline to the model that actually fits the job.
A single run can use local Ollama models for cheap stages, Claude or another premium model for planning/review, and cheaper cloud models for validation — all in one pipeline.
The goal is simple:
Spend premium tokens only where they improve quality.
Anvil is:
open-source and MIT-licensed
local-first
provider-agnostic
built without vendor SDK lock-in
configurable with YAML
designed to take a feature request all the way to a tested PR
It currently supports Claude, OpenAI, Gemini, OpenRouter, OpenCode, Ollama, Gemini CLI, and Google ADK.
I’d love feedback from the PH community:
If your coding agent could route every stage to a different model, how would you split the work?
About Anvil on Product Hunt
“Open-source AI coding agent with per-stage LLM routing”
Anvil was submitted on Product Hunt and earned 3 upvotes and 1 comments, placing #156 on the daily leaderboard. Anvil is an open-source AI coding agent that turns a feature request into a tested pull request. It routes each pipeline stage — clarify, plan, build, test, validate, review, and ship — to the cheapest model that is good enough, across local and cloud LLMs.
On the analytics side, Anvil competes within Open Source, Software Engineering, Developer Tools and GitHub — topics that collectively have 664.6k followers on Product Hunt. The dashboard above tracks how Anvil performed against the three products that launched closest to it on the same day.
Who hunted Anvil?
Anvil was hunted by Esan Mohammad. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Anvil including community comment highlights and product details, visit the product overview.
Esan Mohammad