OpenRouter free models, explained
Free, mid, and frontier - what each tier actually gets you.
What "free" means
OpenRouter hosts hundreds of AI models, and some providers offer their models for $0/token - usually to get developers testing them, or because the model is subsidized for a limited time. Codelazr gives every user (a little bit of) free usage on any model (see how it works), plus unlimited use of these free ones.
When free gets rate-limited
Free models share capacity across everyone using them, so during busy periods you can strike out a few times in a row - slow responses, 429s, or a queue. If that happens, you don't have to wait it out: bring your own API key (BYOK) for direct, unshared access, or grab Codelazr Pro, which is just $10 of AI usage - no subscription, no rate-limit roulette.
Are free models worse?
Usually, yes - free models tend to lag behind paid frontier models on hard coding tasks. But not always. Occasionally a genuinely frontier-class model gets released free for a limited window (Kimi K2 and DeepSeek V3 both had free runs like this) - meaning you can sometimes code with a better model for free than what you'd pay for elsewhere. It doesn't last, so it pays to check in.
We've run a lot of these comparisons ourselves, across both free and paid models - see the Case Studies page for the full set, including free model showcase, top 10 tasks, and no-cherry-picking SaaS build. Or see the numbers rolled up on Stats.
Keep an eye on the free list
OpenRouter's own free-models page updates as models come and go, and shows which ones people are actually using most - a decent signal for which are worth trying.
Browse OpenRouter's free models →Free models can be flaky
Free-tier models get rate-limited, overloaded, or occasionally just reply with garbage. That's true wherever you use them. Codelazr has optional auto-retry and auto-fix-and-recheck built in, so a bad response gets caught and retried rather than shipped as-is - giving free (and cheap) models a much better real-world success rate. Prefer a paid frontier model instead? Works the same way, same editor, no separate setup - just like any other AI coding tool.