Nexith Core は自社主権 GPU クラスタで稼働開始 —— キャッシュヒットは最大90%オフ、OpenAI 互換。詳細を見る →

Apps

One model.
A growing family of apps.

Everything here runs on Nexith Core. Start with Chat today — desktop, coding, and image tools are on the way.

Nexith Chat

Talk to Nexith Core in your browser. Long context, streaming responses, and a memory that carries across sessions — no setup, just open it and start.

Start chatting

Summarize this contract and flag anything unusual.

Here’s the summary. Three clauses stand out — the auto-renewal in §4, an uncapped liability term in §9…

Ask anything…

What you can do with Chat

One window. A surprising amount of range.

Here’s what people actually reach for it — every day, all on one model.

Long context

Read a whole document, not a fragment

Drop in a contract, a research paper, or an entire codebase. With 1M of context it holds the whole thing in mind — so answers cite the real detail instead of guessing from an excerpt.

Chat · contract.pdf

vendor-agreement.pdf · 82 pages

Summarize this and flag anything unusual.

Three clauses stand out:

· §4 — auto-renewal, 60-day notice· §9 — liability is uncapped· §12 — data retained 24 months

Code

Write and debug real code

Ask for a function, paste a stack trace, or hand it a module to refactor. It reasons across files, explains the fix, and gives you something you can actually run.

Chat · fix

This loop skips the last item. What’s wrong?

Off-by-one — the bound should be <= len. Here:

// process every item
for (let i = 0; i <= len; i++) {
process(items[i]);
}

Writing

Draft, then refine until it sounds like you

From a rough first pass to a finished email, post, or spec — set the tone, trim the length, change the angle, and iterate until it reads exactly the way you want.

Chat · draft

Rewrite this to be warmer and half the length.

“Thanks so much for the update — this looks great. One small thought on the timeline, but nothing blocking. Really appreciate the quick turnaround.”

WarmerShorterMore formal

Memory

Tell it once — it remembers

Your stack, your preferences, the project you’re on. Memory carries across sessions, so you never open a new chat and start from scratch again.

Chat · new session

Remembered 3 things from earlier sessions

Give me a quick example.

Sure — in TypeScript and kept short, the way you like it:

const ok = items.every(Boolean);

auth.ts

// agent: add retry with backoff
async function login(u, p) {
+ for (let i = 0; i < 3; i++) {
try { return await api(u, p) }
catch { await wait(2 ** i) }
}
}

Applied retry logic across 3 call sites. Run tests?

Coming soon

Nexith Code

A coding agent that reads your repo, writes and refactors across files, and knows when a change is actually done — not just plausible. Built on the same 1M-context model behind Chat.

Whole-repo reasoning, not single-file guesses
Edits across many files in one pass
Closes the loop — tests, fixes, done

Soon

Nexith Desktop

A native Mac & Windows companion for coding and writing — in the spirit of a Codex- or Claude-style desktop client.

Soon

Nexith Image

An online image-generation tool — describe what you want and create visuals in the browser, at transparent pricing.

Built on one foundation

Every app inherits the same model and systems layer.

Nexith Core

One model behind all of it — 1M context, trained for reasoning, writing, and code.

Cross-session memory

Context that carries between sessions, so your apps pick up where you left off.

Semantic cache

Repeated work is served from cache — faster responses at a lower cost.

Private by default

One egress gate on every response. Your data is never used for training.

Prefer to build your own?

The same model powers our OpenAI-compatible API. Point your SDK at our endpoint and ship your own app.

Read the docs About the model

One model.A growing family of apps.