Aion Labs

LLM 4.8/10

OpenAI-compatible API for the Aion creative-writing/roleplay model family, with a free daily-allowance tier and no credit card.

Aion Labs scores 4.8/10 for free value in LLM. The main constraint: Free tier (default on signup): 15 RPM, 20K tokens/minute, 20K tokens/day across the Aion catalog; daily credit allowance, no card.

Category LLM Kind Roleplay & creative LLMs Caveats Niche provider (roleplay/creative writing, not a general coding/assistant API); tight ~20K tokens/day trial-grade allowance; 18+, content moderation applies; Aion 1.0 / 1.0-mini sunset Jul 4 2026. Renewal daily Card required No Eligibility anyone

Free value score

4.8 / 10

Show the math

Value 4.6/10

value = 0.6 $/mo

weighted score = 0.7 * 4.6/10

Model Quality 5.9/10

value = 33 artificial_analysis_score

weighted score = 0.2 * 5.9/10

Volume 2.6/10

value = 600000 tok/mo

score = 2.6/10

Throughput 3.6/10

value = 20000 tok/min

weighted score = 0.1 * 3.6/10

Request Rate 3.4/10

value = 15 req/min

score = 3.4/10

Access 6/10

value = 6/10

score = 6/10

Key metrics

aion-labs/aion-2.5 33 Best model

20K T/day Tokens/day

20K T/min Tokens/min

15 R/min Requests/min

Models

5 free · 5 total

Model	Family	AA	Access
aion-labs/aion-1.0	Aion	—	free
aion-labs/aion-1.0-mini	Aion	—	free
aion-labs/aion-2.0	Aion	—	free
aion-labs/aion-2.5	Aion	—	free
aion-labs/aion-rp-llama-3.1-8b	Aion	—	free

What you get

Free tier, no credit card

OpenAI-compatible (api.aionlabs.ai/v1)

128K context on Aion 2.x

Daily renewal

Commercial use permitted

Limitations

Aion 1.0 / 1.0-mini sunset Jul 4 2026

The legacy Aion 1.0 and Aion 1.0-mini models retire on 2026-07-04 and are replaced by Aion 2.0.

Sources

"Free tier: $0 — daily credit allowance to try agent jobs, the API and browser chat. No credit card required."
https://www.aionlabs.ai/pricing
"Free tier rate limits: 15 requests/minute, 20,000 tokens/minute, 20,000 tokens/day."
https://www.aionlabs.ai/docs/rate-limits
"OpenAI-compatible API — base URL https://api.aionlabs.ai/v1; works with the OpenAI SDK."
https://www.aionlabs.ai/docs
"Commercial use of the API is permitted under the Terms of Service (§5.1)."
https://www.aionlabs.ai/terms

free-tier openai-compatible roleplay creative-writing

Open service Source ← All LLM