OpenAI: GPT-5.5 vs Microsoft: Phi 4
Side-by-side comparison — pricing, context window, capabilities, and live leaderboard data.
Key differences
- OpenAI: GPT-5.5 has a 1050K-token context window — 64.1× larger than Microsoft: Phi 4's 16K.
- Microsoft: Phi 4 is 99% cheaper per 1K input tokens than OpenAI: GPT-5.5 ($0.0001 vs $0.0050).
- OpenAI: GPT-5.5 is built by OpenAI; Microsoft: Phi 4 is built by Microsoft.
- OpenAI: GPT-5.5 supports vision (image inputs); the other does not.
Specifications
| OpenAI: GPT-5.5 | Microsoft: Phi 4 | |
|---|---|---|
| Provider | OpenAI | Microsoft |
| Context window | 1050K | 16K |
| Max output tokens | 8192 | 8192 |
| Input price / 1K tokens | $0.0050 | $0.0001 |
| Output price / 1K tokens | $0.0300 | $0.0001 |
| Vision support | Yes | No |
| Function calling | No | No |
| License | Proprietary | Proprietary |
About OpenAI: GPT-5.5
US·ClosedGPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token...
View OpenAI: GPT-5.5 reliability and benchmark history →About Microsoft: Phi 4
US·Closed[Microsoft Research](/microsoft) Phi-4 is designed to perform well in complex reasoning tasks and can operate efficiently in situations with limited memory or where quick responses are needed. At 14 billion...
View Microsoft: Phi 4 reliability and benchmark history →Try them yourself
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