AI coding,
like the world has never seen.

Point Claude Code, Codex, or Qwen at Flux and it compiles, tests, and improves your code in the same loop — 50 ms incrementals, content-hash cache, post-quantum-proven binaries, work that settles on-chain. This isn’t a faster build; it’s a way of building software that didn’t exist until now. Try it free — you’ll feel it on the first prompt.

⚡ Start building free →See the numbers ↓

Free on your laptop · no card required · 60-second setup

⚡
⬡
⬡
⚡
⬡
⬡
$ fluxc build --release ✓ cache HIT 85% · 50ms incremental · 34 crates ✓ Finished release in 0.05s
Code with AI. Compile in milliseconds. Prove every byte.
Why Flux
The compiler that builds itself — and your whole stack.

50 ms incremental builds

Edit one file, rebuild in ~50 ms. Content-hash diffing touches only what changed — never your whole graph.

Content-hash cache

Deterministic, immutable artifacts shared across your team and CI. Addressed by content — it can never invalidate wrong.

Agent swarm over MCP

Hand the build to an autonomous agent mesh. Agents split the task graph and share caches live, over the Model Context Protocol.

GPU compute market

Rent idle GPUs by the second for parallel linking, macro expansion and AI-guided optimization. Pay per cycle, not per seat.

Post-quantum provenance

Every binary ships a SLSA-L3 attestation, lattice-signed. Verify the whole graph source→artifact — secure against quantum.

Rust-first, AI-native

Rust-fast and memory-safe, wired to LLMs that auto-tune the build graph, predict regressions and resolve merge skew.

How Flux beats Rust, C & C++
Not by raw CPU speed alone — by building faster, iterating smarter, and integrating AI natively.
Capability⚡ FluxRustCC++
AI-native workflowNativeExternalExternalExternal
Self-hosting / builds itselfYesPartialNoNo
Incremental iteration speedFastModerateManualToolchain-dep
Built-in MCP toolsBuilt-inExternalExternalExternal
Hot-swap codingYesLimitedNoNo
Distributed compilationBuilt-inExternalManualToolchain-dep
Integrated test automationBuilt-inExternalManualToolchain-dep
Search / data / GPU in one stackBuilt-inExternalManualExternal
On-chain verificationBuilt-inExternalManualExternal
DX for autonomous agentsOptimizedGoodMinimalMinimal

Rust, C and C++ remain excellent systems languages. Flux wins as an integrated, self-improving development platform — runtime perf still depends on the target.

Live Flux numbers
Measured live on the Epsilon supernode (fluxc v0.22.0) — the compiler timing itself.
Cold build
1,852 ms
Incremental (no change)
268 ms
Incremental (1-line edit)
440 ms
flux_iterate AI loop
920 ms
Test suite
2 / 2 ✓
MCP tools
44
Crates
104
Dogfooding speedup
6.8×
The first compiler built to be driven by AI.
Start with your AI agent
One line. Flux installs from source and wires its MCP into Claude Code, Codex, or Qwen — then you just talk to it. No control panel, no config.
curl -fsSL https://fluxapp.xyz/setup-flux.sh | bash
⚡ Claude Code⚡ Codex⚡ Qwen

Then just say: “compile this crate with flux” · “spawn a 100-node swarm and measure throughput” · “sign this build with a provenance proof”

Read the Flux skill →Download skills pack
From the Flux blog
Build logs, benchmarks, and the agentic-money frontier.
engineering

Why We Rebuilt the Compiler Toolchain from Scratch in Rust

From parse trees to linker invocations: how FLUX achieves 50ms incremental builds by rethinking every stage of the pipeline.

Read →security

Post‑Quantum Signatures in Build Attestation: A Practical Guide

We implemented CRYSTALS‑Dilithium for SLSA+ provenance—here’s what we learned about speed, size, and verifiability.

Read →performance

The GPU Spot Market for Compilation: Early Results

Linking a 10M‑line C++ project in 0.4s by farming parallel work to idle GPUs. The economics may surprise you.

Read →
Your AI can finally build at the speed it thinks.

FLUX is the AI‑native Rust build orchestrator that redefines compile‑time. Content‑hash cache, 50ms incremental builds, and an agent swarm that scales across GPUs—with post‑quantum proofs that your binaries are untampered. Zero config, zero fluff.

⚡ Start building free →

The Flux-native chain — the proof Flux ships real software. Every block carries a fluxc .proof · 21M hard cap · 10 ms tip-verify · secured by SQIsign × BLAKE3.

Open SIGIL →

Complete your payment

A secure Stripe checkout window just opened. Finish there and you’ll come right back — your card is handled entirely by Stripe.

Reopen secure window
✕

Install via your AI →