Cumulus LabsIonRouter
High throughput, low cost inference. Powered by IonAttention.
Not just fast hardware.
A faster engine: IonAttention.
Our custom inference stack multiplexes models on a single GPU, swaps in ms, and adapts to traffic in real time. Built from the ground up for Grace Hopper.
Bring any model.
Get dedicated streams.
Deploy your finetunes, custom LoRAs, or any open-source model on our fleet. Dedicated GPU streams with no cold starts and per-second billing.
From robots to
real-time video.
Teams use Ion for highest performance robotics perception, multi-camera surveillance, game asset generation, and AI video pipelines.
5 VLMs, 1 GPU.
Five vision-language models on a single GPU — 2,700 video clips, concurrent users, <1s cold starts.
Read the case studyDrop in.
Ship faster.
Point your existing OpenAI client at Ion. Any language, any framework. One line change.
from openai import OpenAI client = OpenAI( api_key="sk-your-key-here", base_url="https://api.ionrouter.io/v1" ) response = client.chat.completions.create( model="qwen3.5-122b-a10b", messages=[{ "role": "user", "content": [ {"type": "image_url", "image_url": {"url": "..."}}, {"type": "text", "text": "What's in this image?"} ] }] )
Models & Pricing
Pay per million tokens. No idle costs.
ZhiPu AI's flagship 600B+ MoE model with state-of-the-art reasoning, coding, and multilingual capabilities, powered by EAGLE speculative decoding on 8x B200 GPUs.
MoonShot AI's frontier reasoning model designed for long document understanding, multi-step reasoning chains, and complex problem decomposition across technical and scientific domains.
MiniMax's flagship 1M-context language model delivering strong reasoning and instruction following across long documents, multi-turn dialogue, and complex analysis.
Cumulus's most capable open-source model — a 122B MoE with 10B active parameters rivaling leading proprietary models on coding, reasoning, and multilingual benchmarks.
A frontier open-source 120B model delivering cutting-edge reasoning and instruction following comparable to leading closed-source systems, ideal for complex agentic workflows and advanced code generation.
A 14B text-to-video model optimized for speed via the FastGen runtime, generating clips in under 10 seconds with strong motion coherence.
Black Forest Labs' fastest Flux model, delivering crisp sub-4-second image generation ideal for real-time applications, prototyping, and high-volume pipelines.
Ready to build?
Start in under a minute. No GPU expertise required.