Cheapest LLM API in 2026
Most developers overpay for LLM APIs. The cost gap between the cheapest and most expensive models is now over 90%. If you're not comparing prices before choosing a provider, you're likely spending 10-50x more than necessary.
Cheapest option right now: DeepSeek V3 via OpenRouter
~80-90% cheaper than GPT-5 and Claude Opus for most workloads. Quality is strong enough for summarisation, classification, and high-volume processing.
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Cost Calculator
Pricing last updated: March 2026
Monthly estimate: ~30M input tokens + ~15M output tokens
Pay-as-you-go · No commitment · Based on real provider pricing
Compare real pricing across 12 models instantly
Why LLM API costs vary so much
Model size, training cost, and provider margin all affect pricing. Smaller, distilled models like DeepSeek V3 and Claude Haiku can handle 80% of production tasks at a fraction of the cost. The expensive models exist for a reason — but most teams don't need them for every request.
When cheap models fall short
Complex reasoning, multi-step code generation, and nuanced writing still benefit from premium models like Claude Opus or GPT-5. The key is routing: use cheap models for volume and premium models only where quality measurably improves outcomes.
The real cost isn't per-token — it's per-month
A model that's $0.50/M tokens cheaper can save thousands at scale. At 500 requests/day with medium-length prompts, the difference between the cheapest and most expensive model is often $200-800/month. That adds up fast.
How to choose the right model
- Choose cheapest — for high-volume, low-risk tasks
- Choose balanced — for most production apps
- Choose premium — when quality matters more than cost
Use the calculator above to find your best option.