OpenAI: GPT-5.1-Codex-Max

openai/gpt-5.1-codex-max

CHAT High tier ReasoningCodingMultimodal Proprietary (API-only)

OpenAI: GPT-5.1-Codex-Max (openai/gpt-5.1-codex-max) is a chat model from openrouter with a 400K-token context window; proprietary (API-only); capabilities tools, vision, reasoning; input image, text; output text.

400KContext

128KMax output

$1.25$ / 1M in

Pricing

Input: $1.25 / 1M tokens
Output: $10 / 1M tokens
Currency: USD
Note: Indicative US list price — verify with the vendor.

Indicative US list price — a reference only, verify with the vendor. Source: litellm. Last verified 2026-07-24.

Specifications

Context window: 400,000 tokens (400K)
Max output: 128,000 tokens
Weights: Proprietary (API-only)
Input modalities: image text
Output modalities: text
Knowledge cutoff: 2024-09-30
Release date: 2025-11-13

Capabilities

tools vision reasoning

Provenance

committedmodels-devopenrouter-api

Last verified: 2026-10-30

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