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OpenAI

GPT-5.3-Codex

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.

Context window
400K

tokens

Max output
128K

tokens per response

Input
Text, Images, Files
Price per token
$0

included in your plan

Capabilities

  • Reasoning
  • Image input
  • File input
  • Tool calling
  • JSON output

Reasoning effort: low, medium, high, xhigh

API

  • OpenAI Chat CompletionsPOST /v1/chat/completions

Supported parameters

  • max_completion_tokens
  • max_tokens
  • reasoning
  • reasoning_effort
  • response_format
  • seed
  • tool_choice
  • tools
  • verbosity

Quickstart

Any OpenAI-compatible client works; point it at Piramyd and use your key. In a coding agent, run npx piramyd instead.

curl https://api.piramyd.cloud/v1/chat/completions \
  -H "Authorization: Bearer $PIRAMYD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "gpt-5.3-codex",
  "messages": [
    {
      "role": "user",
      "content": "Refactor this function to be pure: ..."
    }
  ]
}'

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