GPT 5.1 Codex specs, prices, where it runs and its benchmark standing

Name: GPT 5.1 Codex
Author: OpenAI

closed weights · top 10 on 0 of 1 · released Nov 12, 2025

Provider: OpenAI
Release date: Nov 12, 2025; Boards
Parameters: Not disclosed by OpenAI
Modalities: Text, Image to Text; OpenRouter
License: Proprietary; Boards
Context window: 400K tokens; Pricing
Pricing: $1.25 in / $10 out per 1M tokens; All prices
Hosting: 2 priced API routes · Azure OpenAI (28 regions) · OpenRouter; Pricing Regions
Weights: Closed weights
Benchmarks: 1 board captured

Rank	Board	Category	Score	Of	Over time
14	SWE-bench VerifiedCoding · stale since 2026-02-26 · as “GPT 5.1 Codex (medium)”	Coding	66.0%	39

Versions and release history

3 versions in this line since Nov 12, 2025, from Pricing, OpenRouter and the boards.

Category ranks, more models and catalog changes