GPT-5.3 Codex specs, prices, where it runs and its benchmark standing

Name: GPT-5.3 Codex
Author: OpenAI

closed weights · top 10 on 0 of 1 · released Feb 5, 2026

Provider: OpenAI
Release date: Feb 5, 2026 · Pricing lists Feb 24, 2026; Boards
Parameters: Not disclosed by OpenAI
Modalities: Text, Image, Files to Text; OpenRouter
License: Proprietary; LMArena
Context window: 400K tokens; Pricing
Pricing: $1.75 in / $14 out per 1M tokens; All prices
Hosting: 3 priced API routes · Azure OpenAI (29 regions) · OpenRouter; Pricing Regions
Weights: Closed weights
Benchmarks: 1 board captured

Rank	Board	Category	Score	Of	Over time
81	WebDev ArenaCoding · as “GPT-5.3-Codex (Codex Harness)”	Coding	1,407	82

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