Overview
Strengths & Best For
Replicate is a model API platform that lets developers run thousands of open-source AI models — image generation, video, audio, LLM, and more — via a simple REST API with per-second billing and no infrastructure management. Developers can also package and deploy their own custom models using Cog, Replicate's open-source containerization tool. A top choice for teams that want to integrate AI capabilities into applications without managing GPU infrastructure, with a large community model library covering Stable Diffusion, Flux, Llama, and hundreds of other models.
- Thousands of community models available via API
- Per-second billing — zero idle cost
- Cog: open-source model packaging and deployment
- No infrastructure management required
- Less suited for custom training or fine-tuning at scale
- Pricing can be higher for sustained high-throughput inference
- Limited control over underlying infrastructure
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Vast.ai is a GPU marketplace where prices are set by supply and demand across 40+ data centers. 68+ GPU types spanning Blackwell, Hopper, Ada Lovelace, Ampere, Turing, Volta, Pascal — from B300 and H200 down to RTX 3090. Three pricing tiers: On-Demand (higher availability), Interruptible (lower cost, interruptible), Reserved (committed pricing). Per-second billing, no lock-in. SOC 2 certified. Check the live table for current rates.
- B300, H200, H100 — competitive frontier pricing on marketplace rates
- RTX 5090, RTX 4090 — consumer GPU inference at marketplace rates
- 68+ GPU types from RTX 3060 to B300 — wide selection
- Per-second billing, no minimum hours, no lock-in
- Interruptible tier: lower cost than on-demand
- SOC 2 certified
- Marketplace model — hardware quality and reliability varies by host
- No enterprise SLAs or uptime guarantees
- Interruptible instances can be reclaimed at any time
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Live GPU Pricing
Region Coverage
Popular Comparisons
Provider pages
Key differences
Replicate
Run AI models via API — community library, billed per second
Vast.ai
B300, H200, RTX 5090 — 68+ GPU types, per-second billing