Free LLM APIs Compared: Rate Limits, Models, and Real Costs (2026)

You’re working on a side project or early-stage app and don’t want to pay for LLM calls yet. You search “free llm api” and get flooded with dozens of services claiming to be free. Some deliver real value. Others give tiny trial credits that disappear in an afternoon. A few use your prompts to train their next model without disclosing it upfront. OpenRouter routes traffic across 70+ LLM providers and processes 100 trillion tokens per month. Because it sits in front of those providers, it routes to the same models they serve, including the fastest and longest-context ones, which is worth keeping in mind as you compare them below. 13 platforms offer usable free LLM API access in 2026, including several permanent free tiers for text inference. Limits and trade-offs differ significantly. OpenRouter is a strong starting point, with 20+ free models, a single API key, and no credit card. For raw speed, Groq’s LPU hardware runs Llama 3.3 70B at around 320 tokens per second (Artificial Analysis). For long context, Google AI Studio and several open models reach 1M tokens. OpenRouter routes to both, so you can reach them through one key or go direct. Every free tier has…