Free Models

Try selected models on Infron at no cost.

Infron offers free variants of selected models. Free variants carry the :free suffix (for example deepseek/deepseek-v4-flash:free) and are billed at $0.00 per token. Requests to free models never deduct from your credit balance.

There are two kinds of free access, with different rules:

	Balance required	Daily request limit	Availability
Limited-time promotions (currently qwen/qwen3.8-max-preview:free)	Any positive balance	5 request per min	Time-limited — see promotion period below
Standard free models (all other :free models)	$5 or more	1000 requests per day, shared across all standard free models	Ongoing, lineup changes over time

Your balance is required as an anti-abuse measure only — free-model usage is never charged against it.

Limited-Time Promotion: Qwen3.8 Max Preview

Promotion period: now through July 28, 2026, 11:59 PM Pacific Time (UTC-7).

During the promotion, qwen/qwen3.8-max-preview:free is free with no daily request limit. Any account with a positive credit balance can use it — top up any amount to unlock it.

Model specs:

• 1M token context window, up to 64K output tokens

• Tool calling, streaming, and JSON mode supported

• Served with zero data retention

curl https://llm.onerouter.pro/v1/chat/completions \
  -H "Authorization: Bearer $INFRON_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "qwen/qwen3.8-max-preview:free",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Standard Free Models

All other :free models follow the standard rules:

• Your account balance must be $5 or more. The balance is not consumed by free usage.

• 1000 requests per day per account, shared across all standard free models combined — not 50 per model.

• The daily counter resets at 00:00 UTC.

• Default per-account rate limits still apply.

To list the current free lineup, fetch the models API and look for the :free suffix:

curl https://llm.onerouter.pro/v1/models \
  -H "Authorization: Bearer $INFRON_API_KEY"

The lineup changes over time. When a model's free variant is part of a limited-time promotion, its time window is stated on this page.

Troubleshooting

Error message	What it means	What to do
Free model requires account balance greater than $4.999999.	Your balance is below the $5 required for standard free models.	Top up to $5 or more. Your balance will not be consumed by free usage.
Your current credits have been used up and we are unable to process further rquests	Your account has no positive balance. New accounts start at $0, so this can appear on your very first request.	Add credits — any amount for the promotional model, $5 or more for the full free lineup.
Free model daily limit exceeded (1000 requests per day)	You have used the shared daily pool across standard free models.	Wait for the 00:00 UTC reset, use the promotional model, or use the paid variant.
Request rate increased too quickly	Per-account rate limit — unrelated to the free-model daily pool.	Slow your request rate and retry with backoff.

Important Notes

• Free-model usage is billed at $0.00 and never deducts credits. The balance requirements above exist to prevent abuse.

• Promotions are time-limited. The promotion period is always stated on this page; outside that window the promotional model follows whatever rules are listed here at the time.

• Free variants may route to different providers than their paid counterparts and are served from a shared public resource pool, without SLA.

• If you have questions about free access, reach out at [e-mail].