Model dossier

OpenAI: GPT-5.1-Codex

GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....

ProviderOpenAI Start comparison

Context400,000

Max output128,000

Pricing viewTVP price

Identity

OpenAI: GPT-5.1-Codex

Model ID: openai/gpt-5.1-codex
Canonical slug: openai/gpt-5.1-codex-20251113
Knowledge cutoff: n/a
Created: 11/13/2025

Capabilities

textimagetoolsstructured

Modalities

text+image->texttextimage

Capacity

Context400,000

Max output128,000

TokenizerGPT