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openaiOpenAI: 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...
openai/gpt-5.3-codex
Context Size
400K
Input Price
262,500 pts/M
Output Price
2,100,000 pts/M
Architecture
Text
Image
File
Supported Parameters
include_reasoningmax_completion_tokensmax_tokensreasoningresponse_formatseedstructured_outputstool_choicetools
Details
TokenizerGPT
Max Completion128,000 tokens
Provider Context400K tokens
ModeratedYes
CreatedFeb 24, 2026