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GPT-5.3 Codex
ChatOpenAI
openai/gpt-5.3-codexGPT-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...
15
credits / gen
File Support 400K Context Vision (OR)
About this model
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...
Technical Specifications
Provider
OpenAI
Type
Chat
Context Window
400,000 tokens
Pricing
15 credits
Capabilities
File Support
Can read PDF, DOCX, XLSX & more
400K Context
Large context window for long documents
Vision (OR)
OpenRouter reports vision support