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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 Chat is 100% cheaper than OpenAI: GPT-5 Image
⚡OpenAI: GPT-5 Image is 17ms faster than OpenAI: GPT-5.1 Chat
Price (lower is better), Speed/Latency (lower is better), Performance (higher is better)
| Spec | OpenAI: GPT-5 Image | OpenAI: GPT-5.1 Chat |
|---|---|---|
| Provider | openai | openai |
| Input price / 1M tokens | $10.00 | Free |
| Output price / 1M tokens | $10.00 | — |
| Context window | 400k tokens | 128k tokens |
| Latency (p50) | — | 17ms |
| Best benchmark score | — | — |
| Open source | No | No |
[GPT-5](https://openrouter.ai/openai/gpt-5) Image combines OpenAI's GPT-5 model with state-of-the-art image generation capabilities. It offers major improvements in reasoning, code quality, and user experience while incorporating GPT Image 1's superior instruction following,...
GPT-5.1 Chat (AKA Instant is the fast, lightweight member of the 5.1 family, optimized for low-latency chat while retaining strong general intelligence. It uses adaptive reasoning to selectively “think” on...
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