Model comparison
GPT-5.5 Pro vs Phi-4 Mini
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 30.9 on the Noometry Index. Phi-4 Mini costs 514× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Last verified . 1 shared benchmarks.
MicrosoftSummary
- They share 1 benchmark with published results for both. GPT-5.5 Pro scores higher in 2 categories and Phi-4 Mini in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.3 to 22.4.
- The biggest single-benchmark swing is CritPt: 30.6% for GPT-5.5 Pro and 0% for Phi-4 Mini.
- Phi-4 Mini is cheaper at $0.075 / $0.30 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 128K.
- Phi-4 Mini has downloadable open weights; the other is API-only.
Side by side
| GPT-5.5 Pro | Phi-4 Mini | |
|---|---|---|
| Provider | OpenAI | Microsoft |
| Noometry Index | 64.3 | 30.9 |
| Released | 2026-04-23 | 2024-12-11 |
| Weights | Proprietary | Open |
| Context window | 1.05M | 128K |
| Max output | 128K | 4K |
| Input $ / M tokens | $30 | $0.075 |
| Output $ / M tokens | $180 | $0.30 |
| Results tracked | 14 | 3 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Not comparable
GPT-5.5 Pro: —, Phi-4 Mini: 28.1 (#317)
| Benchmark | GPT-5.5 Pro | Phi-4 Mini |
|---|---|---|
| SciCode | — | 10.8% |
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.3 (#10), Phi-4 Mini: 22.4 (#195)
| Benchmark | GPT-5.5 Pro | Phi-4 Mini |
|---|---|---|
| CritPt | 30.6% | 0% |
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| ARC-AGI-1 | 96.5% | — |
| Chess Puzzles | 64% | — |
| DTBench | 96% | — |
| LMCA | 53.9% | — |
| Epoch Capabilities Index | 162.07 | — |
Math Not comparable
GPT-5.5 Pro: 84.0 (#10), Phi-4 Mini: —
| Benchmark | GPT-5.5 Pro | Phi-4 Mini |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| FrontierMath (Feb 2025 set) | 52.4% | — |
| FrontierMath Tier 4 (v1) | 39.6% | — |
Knowledge GPT-5.5 Pro leads
GPT-5.5 Pro: 64.1 (#19), Phi-4 Mini: 25.3 (#262)
| Benchmark | GPT-5.5 Pro | Phi-4 Mini |
|---|---|---|
| GPQA Diamond | 93.9% | — |
| Vectara Hallucination Rate | — | 23.5% |
Frequently asked questions
Is GPT-5.5 Pro better than Phi-4 Mini?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 30.9 on the Noometry Index. Phi-4 Mini costs 514× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Which is cheaper, GPT-5.5 Pro or Phi-4 Mini?
Phi-4 Mini is cheaper. It lists at $0.075 per million input tokens and $0.30 per million output tokens; GPT-5.5 Pro lists at $30 and $180.
Which has the bigger context window?
GPT-5.5 Pro does, with 1.05M tokens against 128K.
How many benchmarks do GPT-5.5 Pro and Phi-4 Mini share?
1 benchmark has published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Phi-4 Mini has 3.