GPT-5.3-Codex coding

openrouter
openai
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...

Capabilities

Context Window 400k tokens
Max Output 128k tokens
Inputs
Outputs

Pricing (per 1M tokens)

Input $1.75
Output $14.00
Cache Read $0.17
Cache Write -

Supported Parameters

include_reasoningmax_completion_tokensmax_tokensreasoningresponse_formatseedstructured_outputstool_choicetools

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