Compare Aion 3.5 Mini from Aion Labs and Phi 4 from Microsoft on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the OpenRouter API.
Aion 3.5 Mini and Phi 4 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Aion 3.5 Mini, from Aion Labs, has a 262,144-token context window and is priced at $0.70/M tokens input, $1.40/M tokens output on OpenRouter.
Phi 4, from Microsoft, has a 16,384-token context window and is priced at $0.07/M tokens input, $0.14/M tokens output on OpenRouter.
| Attribute | Aion 3.5 Mini | Phi 4 |
|---|---|---|
| Input price | $0.70/M tokens | $0.07/M tokens |
| Output price | $1.40/M tokens | $0.14/M tokens |
| Context window | 262,144 tokens | 16,384 tokens |
| Intelligence Index | Not available | 5.9 |
| Coding Index | Not available | Not available |
| Agentic Index | Not available | Not available |
| Latency (p50) | 1.88 s | 1.63 s |
| Throughput (p50) | 53.0 tok/s | 52.0 tok/s |
Benchmark data updated
Phi 4 is cheaper than Aion 3.5 Mini on OpenRouter: Phi 4 costs $0.07/M tokens input and $0.14/M tokens output, while Aion 3.5 Mini costs $0.70/M tokens input and $1.40/M tokens output.
Aion 3.5 Mini has the longer context window at 262,144 tokens, compared with 16,384 tokens for Phi 4.
Aion 3.5 Mini is faster on OpenRouter, generating a median 53.0 tokens per second compared with 52.0 tokens per second for Phi 4.