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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-5.1 is 100% cheaper than OpenAI: GPT-4 Turbo Preview
⚡OpenAI: GPT-5.1 is 3ms faster than OpenAI: GPT-4 Turbo Preview
Price (lower is better), Speed/Latency (lower is better), Performance (higher is better)
OpenAI: GPT-5.1 is 19% faster
| Spec | OpenAI: GPT-4 Turbo Preview | OpenAI: GPT-5.1 |
|---|---|---|
| Provider | openai | openai |
| Input price / 1M tokens | $10.00 | Free |
| Output price / 1M tokens | $30.00 | — |
| Context window | 128k tokens | 400k tokens |
| Latency (p50) | 19ms | 16ms |
| Best benchmark score | — | — |
| Open source | No | No |
The preview GPT-4 model with improved instruction following, JSON mode, reproducible outputs, parallel function calling, and more. Training data: up to Dec 2023. **Note:** heavily rate limited by OpenAI while...
GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5. It uses adaptive reasoning...
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