OpenAI

gpt-5.1-codex-max-2025-12-04

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...

textNot offered in the current supplier rate cardreasoningfunction tools

gpt-5.1-codex-max-2025-12-04Version date 2025-12-04

Our price

USD / 1M tokens

Tariff unavailable

A verified tariff has not been published for this entry.

OpenRouter reference$1.25 input · $10 output / 1M tokensStandard listed rates · 2026-10-06 · family reference; snapshot rates may differ

Context window

400,000tokens · model specification

Model max output

128,000tokens

First request

Not offered in the current supplier rate card. This entry is not currently enabled in the Tokely API.

Capabilities & limits

Provider: OpenAI
API model ID: gpt-5.1-codex-max-2025-12-04
Category: Text
Model modalities: text, image. Tokely currently accepts text input.

The context includes your instructions, conversation history, tool definitions and generated output. Keep the input and requested output within the model’s context window.

OpenRouter model reference

Related versions

gpt-52025-08-07 gpt-5.12025-11-13 gpt-5.1-codex2025-11-13