Run a Blender Python (bpy) script on a cloud GPU

JANCTION Render runs your bpy script inside Blender 5.0 (5.2 or 5.3 if you pass blender='5.2' or '5.3') on a JANCTION GPU and renders the result. Send the script as text (scene_script in MCP) or as a .py file (CLI / HTTP). The script only builds the scene, camera and frame range; the service sets Cycles, resolution and samples. No local Blender needed. Each new key starts with a welcome credit of up to 500 JPY (100 JPY with no card, 400 JPY more after registering a card, which is not charged) (14 days); after that, previews stay free up to 2 GPU-minutes a day and finals cost 0.1 JPY per GPU-second. AI agents connect at https://render.janction.jp/mcp (remote MCP with OAuth; connecting creates a free key).

Updated 2026-11-12

What it does Your own .blend, bpy script or 3D file (glTF/GLB, FBX, USD, OBJ...) rendered to images or video on a cloud NVIDIA GPU, from an AI app, the terminal or the browser. The first preview needs no payment.
What it does not do It does not speed up the Blender viewport on your machine, does not take non-Blender video, simulations or general GPU jobs, and an AI that is not connected cannot render on its own.

Paste your AI's script and tryTry your own file for free

Browser only; no connector or CLI needed. A 100 JPY welcome credit for a new key (14 days, no card; one per network every 30 days, further keys on the same network share what is left), and 400 JPY more for saving a card that is not charged (once per card); after that, previews stay free up to 2 GPU-minutes a day and finals cost 0.1 JPY per GPU-second.

A minimal script

import bpy, math
for ob in list(bpy.data.objects):
    bpy.data.objects.remove(ob, do_unlink=True)
scene = bpy.context.scene
scene.frame_start, scene.frame_end = 1, 24
bpy.ops.mesh.primitive_monkey_add(location=(0, 0, 1))
cam = bpy.data.objects.new("Camera", bpy.data.cameras.new("Camera"))
scene.collection.objects.link(cam); scene.camera = cam
cam.location = (6, -6, 4); cam.rotation_euler = (math.radians(60), 0, math.radians(45))
sun = bpy.data.objects.new("Sun", bpy.data.lights.new("Sun", "SUN"))
scene.collection.objects.link(sun)

Rules (Blender 5.0)

• Add a camera and set scene.camera; add a light or pass environment='studio'. If both are missing the service adds an automatic camera and sun and says so in warnings.
• Set frame_start / frame_end; animate with obj.keyframe_insert("rotation_euler", frame=n). obj.animation_data.action.fcurves was removed in 5.0; for linear motion set bpy.context.preferences.edit.keyframe_new_interpolation_type = 'LINEAR' first.
• Do not set mat.use_nodes (always on); build materials through mat.node_tree.
• Do not call bpy.ops.render.render or change render settings; do not read the network (the sandbox has none).
• Image files: send them as assets; in the script use os.environ["JR_ASSETS_DIR"] to find them.

Send it

# command line
pip install janction-render
export JANCTION_RENDER_SERVER=https://render.janction.jp
janction-render preview scene.py --frames 1-24
janction-render render scene.py --frames 1-24 --size 1280x720 --samples 64 --wait

# HTTP
curl -X POST https://render.janction.jp/v1/files -H "X-API-Key: $K" -F [email protected]

From an agent, the script is passed as the scene_script argument of render_preview / render_final; the returned scene_id avoids re-sending it.

What runs where

The script runs with --factory-startup inside an isolated, disposable environment (no network access, time limit) on one GPU, then the service applies the render settings and renders the requested frames. Warnings and the log tail come back with the job.

How long it takes

These are individual observations of simple scenes (2026-09-30 to 10-01 UTC, NVIDIA RTX PRO 6000 Blackwell Max-Q Workstation Edition, 96 GB). The 4-GPU-second example used a rotating cube, four 640x360 tiles and 16 samples. GPU time includes Blender startup and scene loading; it is distinct from completion time including queue and transfers. See conditions, round trips and reproduction files. These are not speed guarantees.

render_estimate gives the number before rendering; once a scene has been rendered once, the estimate uses that scene's own measurement.

Free limits

Pricing (since 2026-10-08): Each new key gets 100 JPY of GPU time free with no card (1,000 GPU-seconds, 14 days) for previews and finals, and 400 JPY more once a card is saved on a Stripe page that charges nothing (once per card): up to 500 JPY in all. After it is used up or expires, previews are free up to 2 GPU-minutes per key per day and final renders are paid from prepaid credit at 0.1 JPY per GPU-second. Top-ups (paid) start at 100 JPY. The first top-up during the 14-day welcome period counts 1.5x, with the bonus capped at 500 JPY (100 JPY buys 150 JPY of credit). Top-ups of 2,000 JPY or more get 10 to 20% extra (not combined with the first-top-up bonus; the larger one applies). Top-up bonuses are separate from the welcome credit and the card-saving credit. Payment is on a Stripe Checkout page. One full welcome credit per network every 30 days; further keys from the same network use what is left of that network's credit. A job without enough credit gets HTTP 402 payment_required with a checkout_url. Final renders go up to 3,000 frames per instruction (automatically split internally under one job id), 1080p (1920x1080) on free time and up to 4K (3840x2160) on prepaid credit. The free preview time resets at 00:00 UTC (09:00 JST). No sign-up: connecting creates a key. Inputs and results are deleted 24 hours after last use (normally 7 days for keys that have paid 500 JPY or more in total) and never used for training.

Without a connector

If you cannot add a connector to your AI (plan or administrator settings), the same result is one step away: send the prompt below to the AI and paste the code it returns into the paste-and-render page. The preview needs no payment.

Write a Blender 5.0 bpy script that builds <describe your scene here>. Add a camera and set scene.camera, and add one light. Do not call render and do not change render settings. Reply with the code only.

To fix something, give the AI the preview's notes (too dark, cut off, no light) and paste the rewritten script again.

FAQ

Related

• Blender MCP server for rendering
• How to render Blender without a GPU
• Render a .blend file online on a GPU (free tier): upload, preview, final
• FAQ
• How much does cloud rendering a Blender video cost? Measured GPU seconds and prices

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