Nox Orion Flash 2.5 (New)

Fast Orion model with built-in tools · Page last updated: November 10, 2026

The fast Orion 2.5 — native photo input, workspace tools built in, and the same review at Ultra

Orion Flash 2.5 is the fast model of the Nox 2.5 generation, now publicly available in Plan mode on Pro and MAX. It runs the same engine as Orion Flash 2.1 — a 552-billion-parameter mixture-of-experts model, 8 billion parameters active per token during prefill and 16 billion during decode, with native photo input and a roughly one-million-token context window — and gains the tools of Orion 2.5: the workspace, health research tools from High thinking up, a staged review at Ultra, and any topic in Plan mode, while answering faster and consuming less included usage than Orion 2.5.

Engine: mixture-of-experts, 552 billion parameters total, 8 billion active per token during prefill and 16 billion during decode, with a roughly one-million-token context window — the same engine as Orion Flash 2.1, at the same usage rate. Photos attached to a message are read by the model itself.

Five thinking levels: Low, Medium, High, Extra High and Ultra. Low and Medium stay as fast and as light on usage as before; deeper reasoning, more tool lookups and more checking start at High and grow with each level.

Workspace tools, built in (new for Flash): Orion Flash 2.5 builds interactive pages, charts, calculators, 3D models, Python programs and MP4 video, checks them in an isolated browser sandbox, and opens them beside the chat with a live preview, versions, restore and download. Because it reads images natively, from High up it looks at a screenshot of an existing artifact before editing it. You can also attach files to a message and Nox reads them.

Health research tools from High: clinical reference lookups, official drug labels, PubMed literature search, clinical-trial registry lookups and a cited evidence search. Low and Medium keep the standard medical lookups.

Staged review at Ultra: the same review as Orion 2.5 — a case brief, an evidence step, a draft, an independent audit and the final reply, deeper on MAX — run on the Flash engine. Only the final reply is shown.

Any topic in Plan mode: in Plan mode, Orion Flash 2.5 answers questions outside health as well. Health answers keep Nox's medical answer standard, and the emergency check still runs before every answer.

Copy box: when a reply contains text you will paste somewhere else (a message to send, an email, a prompt, an answer for a form), Orion Flash 2.5 puts just that text in its own box with a Copy button. One tap copies exactly what is in the box, and the explanation stays outside it.

HealthBench: Orion Flash 2.5 has not yet been measured. Results published for Orion 2.1 and Orion Flash 2.1 are not attributed to it.

Availability: now publicly available in Plan mode on Pro and MAX, with no trusted-organization restriction. Existing plan usage limits apply. Not an everyday-chat model.

Capabilities

• 552-billion-parameter mixture-of-experts engine — 8 billion active per token in prefill, 16 billion in decode
• Native photo input
• ~1,000,000-token context window
• Five thinking levels, Low to Ultra
• Built-in workspace: interactive pages, charts, calculators, 3D models, Python and MP4 video, checked in a browser sandbox
• Reads files attached to a message
• Health research tools from High: clinical references, drug labels, PubMed, clinical trials and cited evidence search
• Staged review of health answers at Ultra, deeper on MAX
• Any topic in Plan mode
• Live web access in Plan mode, every source cited
• Copy box: paste-ready text in its own box with a one-tap Copy button

Model details

• Architecture — Mixture-of-experts — 552 billion parameters total; 8 billion active per token during prefill, 16 billion during decode; the same engine as Orion Flash 2.1
• Context window — ~1,000,000 tokens
• Reasoning — Deliberate internal reasoning pass before every answer
• Photo understanding — Yes — native; photos are read by the model itself
• Thinking levels — Five — Low, Medium, High, Extra High, Ultra
• Answer pipeline — Single pass from Low to High; a short case brief before health answers at Extra High; a staged review at Ultra, deeper on MAX. Only the final reply is shown.
• Workspace — Built in, on the web app: artifacts built and checked in an isolated browser sandbox, versioned and downloadable; attached files are read
• Health tools — From High: clinical references, official drug labels, PubMed, clinical-trial registry and cited evidence search; Low and Medium keep the standard medical lookups
• Topics — Any topic in Plan mode; health answers keep the medical answer standard
• Copy box — Text meant to be pasted elsewhere arrives in its own box with a one-tap Copy button; new in the Nox 2.5 models
• HealthBench — Not yet measured on this model. Results published for Orion 2.1 and Orion Flash 2.1 are not attributed to it.
• Live web access — Yes — in Plan mode, every source cited
• Available on — Now publicly available in Plan mode on Pro and MAX; existing usage limits apply

Availability: Now publicly available in Plan mode on Pro and MAX.

Nox Orion Flash 2.5 — frequently asked questions

What is Nox Orion Flash 2.5?

Nox Orion Flash 2.5 is Nox's fast orion model with built-in tools. Orion Flash 2.5 is the fast model of the Nox 2.5 generation, now publicly available in Plan mode on Pro and MAX. It runs the same engine as Orion Flash 2.1 — a 552-billion-parameter mixture-of-experts model, 8 billion parameters active per token during prefill and 16 billion during decode, with native photo input and a roughly one-million-token context window — and gains the tools of Orion 2.5: the workspace, health research tools from High thinking up, a staged review at Ultra, and any topic in Plan mode, while answering faster and consuming less included usage than Orion 2.5.

What can Nox Orion Flash 2.5 do?

Nox Orion Flash 2.5's capabilities: 552-billion-parameter mixture-of-experts engine — 8 billion active per token in prefill, 16 billion in decode; Native photo input; ~1,000,000-token context window; Five thinking levels, Low to Ultra; Built-in workspace: interactive pages, charts, calculators, 3D models, Python and MP4 video, checked in a browser sandbox; Reads files attached to a message; Health research tools from High: clinical references, drug labels, PubMed, clinical trials and cited evidence search; Staged review of health answers at Ultra, deeper on MAX; Any topic in Plan mode; Live web access in Plan mode, every source cited; Copy box: paste-ready text in its own box with a one-tap Copy button.

What architecture does Nox Orion Flash 2.5 use?

Architecture: Mixture-of-experts — 552 billion parameters total; 8 billion active per token during prefill, 16 billion during decode; the same engine as Orion Flash 2.1

How large is Nox Orion Flash 2.5's context window?

Context window: ~1,000,000 tokens

Which thinking levels does Nox Orion Flash 2.5 offer?

Thinking levels: Five — Low, Medium, High, Extra High, Ultra

Which Nox plans include Nox Orion Flash 2.5?

Now publicly available in Plan mode on Pro and MAX.

Related Nox models

• Nox GHI 1 — The officially released model system that powers Pebs, Nox's agent
• Nox Orion 2.5 — The new flagship — workspace tools built in, health research tools, and a staged review at Ultra
• Nox Orion 2.6 Cyber Preview — A dedicated security model for defensive and authorized security work — hardened against misuse and prompt injection
• Nox Orion 2.1 — The Nox 2.1 flagship, with a peer-review answer pipeline
• Nox Orion 2.1 Pro — Visualize your body: 3D models, code, and MP4 video
• Nox Orion Flash 2.1 — The fast Orion on a new engine — 552B mixture-of-experts, native photo input
• Nox Vela 2.5 — The fast everyday model on every plan — now reads images
• Nox Voice 2 — The most powerful Nox voice yet — expressive, interruptible, Plan mode in the call

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