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Flint: Fix bugs and write tests with a coding agent (39.8B)

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Made by Recursive Superintelligence, Inc.

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Let an AI model investigate code, fix bugs, add features and write tests, for developers who host their own coding agents.

Model details

Original model RecursiveSI/flint

Write & reason

Input Text Output Text

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Ways to use it Run locally

What it does

Flint is a mixture-of-experts language model: of its 39.8B total parameters, only about 2.5B are used for each word piece (token). It reads and writes text, reasons, and calls tools over several turns, so a coding agent can investigate a project and make changes. Prompt plus output can reach 262,144 tokens.

How to use it

Serve the BF16 checkpoint with the SGLang kit in the sglang folder, then connect your agent through OpenAI-compatible tool calls, a format that lets the model ask your app to run tools. Keep returned reasoning in the conversation history. Quantized (smaller) versions for NVIDIA and Apple Silicon are prepared separately.

Common use cases

  • Point an agent at a repository with a reported bug and get a proposed code fix you can test and review.
  • Describe a new feature for an existing codebase and get implementation code plus tests that check it.

Can I use this?

Needs a model runtime on your computer

Requirements Open source under Apache-2.0. Serve on one B300 or H200 GPU per replica; the sglang folder's documentation covers requirements and multi-GPU setups. Allow at least 32768 output tokens for hard problems.

Caveat Test generated code and review important changes before applying them. Your app must enforce its own tool permissions, because the model can still choose an unsafe or incorrect action.

Worth knowing Can produce wrong or harmful content, faulty code and unsafe tool calls. Long reasoning can slow answers or use up the output budget before an answer is finished. Licensed under Apache License 2.0.

Why it's here

Not trending this week

Last seen on the Hugging Face trending list on 2 November 2026. It stays on BuildTube so you can still find it.

  • 1,373 people have liked it on Hugging Face.
  • It was downloaded 44,352 times in the last 30 days.

Numbers checked on 8 November 2026; not refreshed since.

Behind it

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BuildTube has not run or verified this project. Everything above is written from what the creator published.

Made this?

Quick questions

What is Flint?
Flint is a mixture-of-experts language model: of its 39.8B total parameters, only about 2.5B are used for each word piece (token).
What can I use Flint for?
Point an agent at a repository with a reported bug and get a proposed code fix you can test and review; Describe a new feature for an existing codebase and get implementation code plus tests that check it
Can I run Flint on my computer?
It runs on your own hardware with a model runtime. Serve on one B300 or H200 GPU per replica; the SGLang folder's documentation covers requirements and multi-GPU setups.
What do I need to use Flint?
One B300 or H200 GPU per running copy, using the included SGLang serving kit. Transformers modeling code is not included yet.
What license does Flint use?
Licensed under Apache License 2.0.

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