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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 Codex
⚡OpenAI: GPT-5.1 Chat is 19ms faster than OpenAI: GPT-5 Codex
Price (lower is better), Speed/Latency (lower is better), Performance (higher is better)
OpenAI: GPT-5.1 Chat is 112% faster
| Spec | OpenAI: GPT-5 Codex | OpenAI: GPT-5.1 Chat |
|---|---|---|
| Provider | openai | openai |
| Input price / 1M tokens | $1.25 | Free |
| Output price / 1M tokens | $10.00 | — |
| Context window | 400k tokens | 128k tokens |
| Latency (p50) | 36ms | 17ms |
| Best benchmark score | — | — |
| Open source | No | No |
GPT-5-Codex is a specialized version of GPT-5 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....
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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