The three big cloud-GPU names price and position themselves very differently. Here's what each actually costs right now (H100 from ~$1.73/hr on Vast, 22 Sep 2026) and which to use.
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The three names you'll keep seeing for renting AI GPUs — RunPod, Vast.ai, and Lambda — aren't really competing for the same customer, which is why 'which is cheapest' has a more useful answer than a single winner. Vast.ai is a marketplace where independent hosts undercut each other, so it usually has the lowest spot prices. Runpod balances competitive pricing with a cleaner experience and strong serverless options. Lambda targets serious training with reserved capacity and reliability. Pick by whether you want rock-bottom price, ease, or training-grade stability — and this piece sits under our cloud-GPU pricing pillar, where I track the wider market.
What they actually cost right now
Qualitative rankings only get you so far, so here are real single-GPU rates. The Vast.ai and RunPod columns are pulled straight from our own price tracker, captured 22 September 2026; Vast is a spot marketplace so I show the cheapest live offer (the median runs higher). Lambda isn't in our live tracker — those are its published on-demand rates from its pricing page, shown for context.
Vast.ai's model is a race to the bottom in the best sense: independent providers list their spare GPUs and compete on price, so you'll often find the cheapest hourly rate there — at the cost of variable reliability and a rougher experience. RunPod is the balanced pick: prices are competitive, the platform is polished, and its serverless offering is genuinely useful for deploying inference. Lambda positions itself for teams doing real training work, with reserved instances and a focus on stability over squeezing out the last cent. So the 'cheapest' depends on what you're optimising: raw spot price (Vast), price-plus-convenience (RunPod), or reliability for long jobs (Lambda).
Vast.ai vs RunPod
Vast.ai
Marketplace · cheapest
vs
RunPod
Balanced · easy
Lowest
Spot price
Competitive
Rougher
Ease of use
Polished
Variable
Reliability
Good
Limited
Serverless/inference
Strong
Cheapest spot
Best for
Convenience
Vast.ai wins 1wins 3 RunPod
Three providers, three philosophies: cheapest (Vast), easiest (RunPod), most stable (Lambda). · Unsplash
Which to choose
My practical advice: if you want the absolute cheapest hourly rate and don't mind a rougher experience and occasional interruptions, use Vast.ai's spot market. If you want a clean experience at a fair price — the best default for most people — use RunPod, especially if you'll deploy inference with its serverless option. If you're a team doing sustained training and value reliability over saving a few cents, Lambda. And whatever you pick, compare live prices first, because the cheapest provider for a specific GPU changes throughout the day.
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Want the cheapest hourly rate? Start on Vast.ai
Vast.ai's marketplace almost always has the lowest spot price — an H100 from about $1.73/hr (22 Sep 2026). Best for interruptible work; checkpoint for long runs.
Referral link — we may earn a commission at no cost to you. Prices on our compare page are the provider's live figures, cheapest first; this never changes the ranking.
Quick answers
Which is cheapest: RunPod, Vast.ai or Lambda?
For raw spot prices, Vast.ai is usually cheapest because it's a marketplace where independent hosts compete — an H100 from about $1.73/hr on 22 September 2026, versus $1.99/hr on RunPod on-demand and Lambda's published $3.29/hr. RunPod is close and often better value once you factor in ease of use and reliability. The cheapest for any specific GPU changes hourly, so compare live prices — but as a rule, Vast.ai for lowest spot cost, RunPod for best balance.
Is Vast.ai safe and reliable?
It's a legitimate marketplace used widely for AI, but reliability is more variable than managed providers because you're renting from independent hosts of varying quality. For interruptible work like inference or experimentation, that's a fine trade for the low price. For a critical long training run you don't want interrupted, a more managed provider (RunPod or Lambda) is worth the premium. Check host ratings and use checkpointing on Vast.
Which provider is best for beginners?
RunPod, generally — it has the cleanest experience, clear pricing, good documentation, and a serverless option that makes deploying a model straightforward. Vast.ai is cheaper but rougher, which can frustrate newcomers. Lambda is more oriented toward teams and training. If you're new to renting GPUs and want it to just work at a fair price, start with RunPod, then explore Vast.ai for cheaper spot rentals once you're comfortable.
Referral link
Managed pods + serverless
Prefer a polished experience and serverless? Runpod balances price and ease — H100 about $1.99/hr on-demand (22 Sep 2026).
