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Side-by-side comparison of API pricing, context window, latency, and benchmark performance. Data refreshed daily from provider APIs and ModelStop's own latency probes.
⚡OpenAI: GPT-4.1 Nano is 13ms faster than OpenAI: GPT-5.1-Codex
📈OpenAI: GPT-4.1 Nano scores 1270.0 pts higher on benchmarks
Price (lower is better), Speed/Latency (lower is better), Performance (higher is better)
OpenAI: GPT-4.1 Nano is 72% faster
| Spec | OpenAI: GPT-4.1 Nano | OpenAI: GPT-5.1-Codex |
|---|---|---|
| Provider | openai | openai |
| Input price / 1M tokens | Free | Free |
| Output price / 1M tokens | — | — |
| Context window | 1048k tokens | 400k tokens |
| Latency (p50) | 18ms | 31ms |
| Best benchmark score | 1270.0 | — |
| Open source | No | No |
For tasks that demand low latency, GPT‑4.1 nano is the fastest and cheapest model in the GPT-4.1 series. It delivers exceptional performance at a small size with its 1 million...
GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....
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