SIDE BY SIDE
GPT-5.1-Codex-Max vs GPT-5.2-Codex
Both are GPT models. GPT-5.2-Codex was added to OpenRouter on 2026-01-14, GPT-5.1-Codex-Max on 2025-12-04.
| Field | GPT-5.1-Codex-Max | GPT-5.2-Codex |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Family | GPT | GPT |
| Province | The Cedar Forest | The Cedar Forest |
| Context window | 400K tokens | 400K tokens |
| Maximum output | 128K tokens | 128K tokens |
| Input / 1M tokens | $1.25 | $1.75 |
| Output / 1M tokens | $10.0 | $14.0 |
| Accepts | text, images | text, images |
| Produces | text | text |
| Reasoning | Yes | Yes |
| Tool use | Yes | Yes |
| Added to OpenRouter | 2025-12-04 | 2026-01-14 |
| Model ID | openai/gpt-5.1-codex-max | openai/gpt-5.2-codex |
Questions and answers
Which is cheaper, GPT-5.1-Codex-Max or GPT-5.2-Codex?
GPT-5.1-Codex-Max costs less for both input ($1.25 vs $1.75) and output ($10.0 vs $14.0) per million tokens. On input, GPT-5.1-Codex-Max is 29% cheaper.
Which has the larger context window?
Both have a 400K-token context window.
What can one do that the other cannot?
Nothing among reasoning, tool use and image input: both support reasoning, tool use and image input.
Answers are computed from the 2026-10-24 catalog snapshot.