GPT 5 Codex
GPT-5 optimized for code generation and software engineering tasks.
Built for agentic coding workflows with strong multi-file understanding and tool use support.
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The model supports vision/image input, a 400K context window.
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Who created GPT 5 Codex?
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GPT 5 Codex was created by OpenAI.
Is GPT 5 Codex a reasoning model?
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No, GPT 5 Codex is not a reasoning model. It responds directly without an extended internal thinking step. For tasks requiring deep chain-of-thought reasoning, consider models like Claude, o-series from OpenAI, or Gemini Thinking.
Does GPT 5 Codex support image or vision input?
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Yes, GPT 5 Codex supports vision/image input. You can share images in your conversation and the model will analyze and respond based on their content.
Does GPT 5 Codex support audio?
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No, GPT 5 Codex does not support audio input.
What is the context window of GPT 5 Codex?
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GPT 5 Codex has a context window of 400K tokens, meaning it can process approximately 300,000 words of context at once.
Is GPT 5 Codex open source?
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GPT 5 Codex is a proprietary model developed by OpenAI. The model weights and training data are not publicly available.
What is GPT 5 Codex good at?
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Based on benchmark data, GPT 5 Codex excels at: visual analysis and image understanding. It is OpenAI's capable model suitable for a wide range of tasks.
Where can I use GPT 5 Codex?
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You can chat with GPT 5 Codex on idapt.app — no separate API key required. idapt is an AI workspace with 200+ models, agents, computers, and tasks. You can also access GPT 5 Codex through OpenAI's own API or platform.