AionLabs: Aion 3.5 API Pricing
AionLabs: Aion 3.5 costs $3.00 per 1M input tokens and $6.00 per 1M output tokens (cache reads: $0.750). Context window: 262K. Prices verified 2026-10-21 · source
Alternatives to consider
Cheapest aion-labs model — 77% less per month
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From our own daily snapshot archive — independent of provider announcements.
Token economics
| Token type | Price | vs base input |
|---|---|---|
| Standard input | $3.00 | — |
| Cache read | $0.750 | −75% |
| Output | $6.00 | — |
Prompt caching stores repeated context server-side: reads cost far less, but writes carry a one-time premium.
Higher effort = deeper thinking = more reasoning tokens billed as output.
What would AionLabs: Aion 3.5 cost you per month?
| Workload | Requests/mo | Avg tokens (in/out) | Est. monthly cost |
|---|---|---|---|
| Light chatbot | 10,000 | 800 / 400 | $48.00 |
| Coding agent | 5,000 | 8,000 / 2,000 | $180.00 |
| RAG pipeline | 30,000 | 4,000 / 500 | $450.00 |
| Doc summarizer | 2,000 | 20,000 / 1,000 | $132.00 |
Estimates use list prices without prompt caching. Caching can cut input cost by up to 90% on repeated context.
About AionLabs: Aion 3.5
Aion 3.5 is a multi-model roleplaying and storytelling system from AionLabs, built on the GLM family of models. It uses a collaborative generation process in which multiple specialized models each...
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Frequently asked questions
How much does AionLabs: Aion 3.5 cost?
AionLabs: Aion 3.5 costs $3.00 per 1M input tokens and $6.00 per 1M output tokens; cached input tokens cost $0.750 per 1M. Verified 2026-10-21 — provider source.
What is the context window?
262K tokens, with up to 33K output tokens per response. That's roughly 328 pages of text in a single request.
Does it support prompt caching?
Yes — cached input is $0.750/1M, about 75% cheaper than standard input. Agents and RAG workloads with repeated context benefit most.
What's a cheaper alternative?
ScaleDown: Summarize saves about 99% on a typical workload with comparable quality.
Official resources
- AionLabs: Aion 3.5 on OpenRouter — live endpoint, pricing source of record.
- Artificial Analysis leaderboard → — independent intelligence and performance rankings.
- Shred your current bill — paste a CSV and see if switching saves money.