Is GPT-5.1 Codex or GPT-5.1 Codex Max cheaper?
Their total cost is roughly equal: $1.25 / 1M tokens input / $10 / 1M tokens output.
Model comparison
GPT-5.1 Codex vs GPT-5.1 Codex Max
Compare GPT-5.1 Codex (OpenAI) and GPT-5.1 Codex Max (OpenAI) by price, context, capabilities, and latency.
Which should you pick?
- Price: roughly equal total cost ($1.25 / 1M tokens input / $10 / 1M tokens output).
Side by side
GPT-5.1 Codex vs GPT-5.1 Codex Max — full comparison
Compare price, provider, context, capabilities, latency, and source basis.
| Model | Provider | Input | Output | Context | Capabilities | Best for | Latency | Status | Source |
|---|---|---|---|---|---|---|---|---|---|
| GPT-5.1 Codexopenai/gpt-5.1-codex | OpenAI | $1.25 / 1M tokens | $10 / 1M tokens | 400k | StreamingTool callingJSON modeVision | image understanding, multimodal chat | 2044-3136ms | Catalog | Platform curated |
| GPT-5.1 Codex Maxopenai/gpt-5.1-codex-max | OpenAI | $1.25 / 1M tokens | $10 / 1M tokens | 400k | StreamingTool callingJSON modeVision | image understanding, multimodal chat | 1802-3024ms | Catalog | Platform curated |
FAQ
GPT-5.1 Codex vs GPT-5.1 Codex Max FAQ
Which has a larger context window, GPT-5.1 Codex or GPT-5.1 Codex Max?
Both offer the same context window: 400k tokens.
GPT-5.1 Codex vs GPT-5.1 Codex Max for Vision: which should I pick?
Both target Vision. Pick GPT-5.1 Codex to optimize cost, or GPT-5.1 Codex for the longer context window. Test both on real prompts before committing production traffic.