SIDE BY SIDE
Aion-3.0 vs Aion 3.5
Both are AionLabs models. Aion 3.5 was added to OpenRouter on 2026-09-23, Aion-3.0 on 2026-07-07.
| Field | Aion-3.0 | Aion 3.5 |
|---|---|---|
| Provider | AionLabs | AionLabs |
| Family | AionLabs | AionLabs |
| Province | The High Peaks | The High Peaks |
| Context window | 131K tokens | 262K tokens |
| Maximum output | 33K tokens | 33K tokens |
| Input / 1M tokens | $3.00 | $3.00 |
| Output / 1M tokens | $6.00 | $6.00 |
| Accepts | text | text |
| Produces | text | text |
| Reasoning | Yes | Yes |
| Tool use | Yes | Yes |
| Added to OpenRouter | 2026-07-07 | 2026-09-23 |
| Model ID | aion-labs/aion-3.0 | aion-labs/aion-3.5 |
Questions and answers
Which is cheaper, Aion-3.0 or Aion 3.5?
They cost the same: $3.00 per million input tokens and $6.00 per million output tokens.
Which has the larger context window?
Aion 3.5: 262K tokens against 131K for Aion-3.0 (2× as long).
What can one do that the other cannot?
Nothing among reasoning, tool use and image input: both support reasoning and tool use.
Answers are computed from the 2026-10-24 catalog snapshot.