GPT-5 Codex is an AI model from OpenAI in the GPT series. Agent Mag tracks its context window, pricing, modalities, and supported API parameters on this page.

How do you use GPT-5 Codex?

GPT-5 Codex can be called through OpenRouter's OpenAI-compatible API using the model ID openai/gpt-5-codex. This page includes a ready-to-run curl example and the supported parameter list.

GPT-5 Codex is a paid model in the OpenRouter catalog, with separate input and output token pricing shown on this page.

GPT-5 Codex

All models

OpenAIGPT Moderated

GPT-5 Codex

400K context

$1.25/M input

$10.00/M output

GPT-5 Codex is an AI model from OpenAI built for agent workflows, with support for text, image input and text output. GPT-5-Codex is a specialized version of GPT-5 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....

What is GPT-5 Codex?

GPT-5 Codex is an AI model from OpenAI that Agent Mag tracks for pricing, context window, modalities, benchmarks, and API compatibility. Builders can use this page to compare GPT-5 Codex against other models for agent workflows and production deployments.

Model ID

GPT-5-Codex is a specialized version of GPT-5 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....

Modalities

Input

textimage

Output

text

Supported Parameters

include_reasoningmax_tokensreasoningresponse_formatseedstructured_outputstool_choicetools

More from OpenAI

GPT-5.4 Image 2

272K ctx$8.00/M

[GPT-5.4](https://openrouter.ai/openai/gpt-5.4) Image 2 combines OpenAI's GPT-5.4 model with state-of-the-art image generation capabilities from GPT Image 2. It enables rich multimodal workflows, allowing users to seamlessly move between reasoning, coding, and...

GPT-5.4 Nano

400K ctx$0.200/M

GPT-5.4 nano is the most lightweight and cost-efficient variant of the GPT-5.4 family, optimized for speed-critical and high-volume tasks. It supports text and image inputs and is designed for low-latency...

GPT-5.4 Mini

400K ctx$0.750/M

GPT-5.4 mini brings the core capabilities of GPT-5.4 to a faster, more efficient model optimized for high-throughput workloads. It supports text and image inputs with strong performance across reasoning, coding,...

GPT-5.4 Pro

1.1M ctx$30.00/M

GPT-5.4 Pro is OpenAI's most advanced model, building on GPT-5.4's unified architecture with enhanced reasoning capabilities for complex, high-stakes tasks. It features a 1M+ token context window (922K input, 128K...

Stay in the know

GPT-5 Codex

What is GPT-5 Codex?

More from OpenAI

Related content