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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-Codex-Max is 10ms faster than OpenAI: GPT-5.1-Codex
Price (lower is better), Speed/Latency (lower is better), Performance (higher is better)
OpenAI: GPT-5.1-Codex-Max is 48% faster
| Spec | OpenAI: GPT-5.1-Codex | OpenAI: GPT-5.1-Codex-Max |
|---|---|---|
| Provider | openai | openai |
| Input price / 1M tokens | Free | Free |
| Output price / 1M tokens | — | — |
| Context window | 400k tokens | 400k tokens |
| Latency (p50) | 31ms | 21ms |
| Best benchmark score | — | — |
| Open source | No | No |
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....
GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic...
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