AionLabs Aion 3.5 vs SpaceXAI Grok 4.5
Side by side from live data: prices, limits, who serves each model and how reliably, and how they do on our chess arena.
In short
- Grok 4.5 is 1.3× cheaper at a typical mix of 3 input tokens per output token.
- Grok 4.5 accepts longer prompts: 500K vs 262K tokens.
- Aion 3.5 is the newer model (released 2026-09-23).
| Aion 3.5 | Grok 4.5 | |
|---|---|---|
| Vendor | AionLabs | SpaceXAI |
| Released | 2026-09-23 | 2026-07-08 |
| Input / 1M | $3.00 | $2.00 |
| Output / 1M | $6.00 | $6.00 |
| Cached input / 1M | $0.75 | $0.30 |
| Blended / 1M (3:1) | $3.75 | $3.00 |
| Context | 262K | 500K |
| Max output | 33K | 450K |
| Accepts | text | text, image, file |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 1 | 4 |
| Cheapest provider, output | $6.00 | $6.00 |
| Best provider uptime, 24 h | 99.92% | 100% |
| Chess arena rating | not playing | not playing |
| Vendor API status | — | Operational |
Cost calculator
Aion 3.5
$270 per month$9.00 per day
Grok 4.5
$210 per month$7.00 per day
Grok 4.5 saves $60.00 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
Compare Aion 3.5 with