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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 Codex is 75% cheaper than OpenAI: GPT-4o (2024-05-13)
⚡OpenAI: GPT-4o (2024-05-13) is 18ms faster than OpenAI: GPT-5 Codex
Price (lower is better), Speed/Latency (lower is better), Performance (higher is better)
OpenAI: GPT-5 Codex is 300% cheaper
OpenAI: GPT-4o (2024-05-13) is 100% faster
| Spec | OpenAI: GPT-4o (2024-05-13) | OpenAI: GPT-5 Codex |
|---|---|---|
| Provider | openai | openai |
| Input price / 1M tokens | $5.00 | $1.25 |
| Output price / 1M tokens | $15.00 | $10.00 |
| Context window | 128k tokens | 400k tokens |
| Latency (p50) | 18ms | 36ms |
| Best benchmark score | — | — |
| Open source | No | No |
GPT-4o ("o" for "omni") is OpenAI's latest AI model, supporting both text and image inputs with text outputs. It maintains the intelligence level of [GPT-4 Turbo](/models/openai/gpt-4-turbo) while being twice as...
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....
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