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OpenAI: GPT-5 Codex
openai/gpt-5-codex
VisionTool useJSONReasoningStreaming
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....
Pricing
Input
$1.25 / 1M
Output
$10.00 / 1M
Specs
Context
400,000 tokens
Input
text, image
Output
text
Knowledge cutoff: 2024-09-30
Released: 2025-09
Supported parameters
include_reasoningmax_tokensreasoningresponse_formatseedstructured_outputstool_choicetools