In brief: A free LLM API usually means one of three things: a free-trial tier, a recurring free quota, or permanently zero-priced models. The FlowBarAI free trial needs no top-up, and its catalog lists flowbar-free at $0 per 1M input and output tokens; the free-trial group reaches 15 of 126 catalog entries.
Three things 'free' can mean
Before comparing offers, work out which of these you are being given, because they have very different limits.
| Kind of free | What it usually is | What to confirm before you build on it |
|---|---|---|
| Free-trial tier | Time- or usage-limited access without payment | Whether it needs a top-up or a card, and what happens when it ends |
| Recurring free quota | A resetting allowance on an account | The reset period, the rate limits, and whether it applies to all models |
| Zero-priced model | A specific model listed at $0 per 1M tokens | Whether it is a permanent listing or a promotion, and its rate limits |
What the FlowBarAI free trial includes
- No top-up is required to start. You create an API key and call the OpenAI-compatible endpoint.
- The catalog currently lists 2 entries at $0 per 1M input tokens and $0 per 1M output tokens.
- flowbar-free is priced at $0 per 1M input tokens and $0 per 1M output tokens, and is available in all four access groups, including the free-trial group.
- The free-trial group reaches 15 of the 126 catalog entries, so you can test real paid models before committing budget.
- Failed requests are not charged.
| Entry | Input $/1M | Output $/1M | Reachable from |
|---|---|---|---|
| flowbar-free | $0 | $0 | Free trial · $10+ · $30+ · $80+ |
| deepseek-ai/DeepSeek-OCR | $0 | $0 | $10+ · $30+ · $80+ |
Every figure on this page was read from FlowBarAI's live pricing API on September 12, 2026. The authoritative, always-current list is the pricing page, with model details on the models page.
Zero-priced entries and their access groups as listed on September 12, 2026. Prices and listings are subject to change; check the pricing page for current values.
What top-ups unlock
FlowBarAI is pay-as-you-go, and cumulative successful top-ups widen the model catalog in steps. The counts below are the number of catalog entries each group can reach, read from the live pricing API. Setup and endpoint details are in the docs, and the pricing page lists the current tiers.
| Access group | How it is unlocked | Catalog entries reachable |
|---|---|---|
| Free trial | No top-up required | 15 |
| Basic | Cumulative successful top-ups of $10 or more | 99 |
| Standard | Cumulative successful top-ups of $30 or more | 109 |
| Premium | Cumulative successful top-ups of $80 or more | 126 |
What to check before trusting any free LLM API
- Rate limits: a free quota with a low requests-per-minute ceiling is fine for a prototype and unusable for a product.
- Model scope: confirm which models the free allowance covers, not just the total token budget.
- Termination terms: find out whether the free allowance ends on a date, a spend threshold or an account action.
- Data handling: read the provider's policy on how submitted content is stored or used.
- Billing behaviour: confirm whether failed requests, retries and cancellations are charged.
What a free LLM API list usually leaves out
A free LLM API list is a good starting point and a poor place to finish. Lists of free endpoints rarely state the rate limit, the reset period, which models the allowance covers, or whether the provider charges for failed and retried requests. Those four details decide whether the free option survives contact with real traffic.
Two more checks are worth making. First, whether the free allowance is a one-time grant or resets — a one-time grant is a trial, not a tier. Second, whether the model list behind the free tier is the same catalog you would get after paying: on FlowBarAI the free trial reaches a subset of the catalog, and cumulative top-ups widen it.
Try it in five minutes
- Create an account and generate an API key — the FlowBarAI free trial needs no top-up.
- Point your OpenAI SDK at the FlowBarAI base URL; see the docs for the exact value.
- Call flowbar-free, listed at $0 per 1M input and output tokens, to confirm the integration end to end.
- Run the same prompt against a paid model from the free-trial group and compare quality on your own task.
- Price the workload with the published rate table before you scale it up.
Referral rewards are also active: the invite page explains how rewards are credited and what the current terms are, so read it there rather than assuming a figure.
Frequently asked questions
Is there a free LLM API with no top-up?
Yes. The FlowBarAI free trial requires no top-up: you create an API key and start calling the OpenAI-compatible endpoint. The current free-trial scope is listed on the pricing page.
Is flowbar-free really free?
In the pricing data read on September 12, 2026, flowbar-free is listed at $0 per 1M input tokens and $0 per 1M output tokens, and it is available in all four access groups. Listings and prices can change, so check the pricing page for the current entry.
How many models can I reach in the free tier?
The free-trial group reaches 15 of the 126 catalog entries as read on September 12, 2026. Cumulative successful top-ups of $10, $30 and $80 raise that to 99, 109 and 126 entries.
What is the catch with free LLM APIs?
The usual limits are rate caps, a narrower set of models, and terms that can change. A free allowance is best used to validate an integration and measure quality on your own workload before you commit budget.
What happens when the free trial ends?
FlowBarAI is pay-as-you-go: you are billed per 1M tokens at the rates published on the pricing page, with no subscription required. Failed requests are not charged.
Do free LLM API models expire?
They can. Free listings, model versions and prices change over time, which is why this page states the date its figures were read and points to the live pricing page for the current values.
Related reading
- OpenRouter alternatives: multi-model and self-hosted options
- LLM API pricing comparison: 104 models sorted by input rate
- LiteLLM alternatives: self-hosted vs managed
- How to choose a cheap LLM API
- How to compare LLM API pricing
- AI video generation platform workflow
- FlowBarAI in English: gateway overview
Start with the free trial
No top-up required, OpenAI-compatible endpoint, and published rates when you outgrow the free tier.