Model dossier

OpenAI: GPT-5.3-Codex

GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results...

ProviderOpenAI Start comparison

Context400,000

Max output128,000

Pricing viewTVP price

Identity

OpenAI: GPT-5.3-Codex

Model ID: openai/gpt-5.3-codex
Canonical slug: openai/gpt-5.3-codex-20260224
Knowledge cutoff: n/a
Created: 2/24/2026

Capabilities

textimagefiletoolsstructured

Modalities

text+image+file->texttextimagefile

Capacity

Context400,000

Max output128,000

TokenizerGPT