---
id: "openai/gpt-5.2-pro"
also: ["openai/gpt-5.2-pro-20251211", "vercel/openai/gpt-5.2-pro"]
card_usd_per_m: "21.0 in, 168.0 out, at openai"
cheapest_list_usd_per_m: "21.0 in, 168.0 out, at openai on openrouter"
cheapest_effective_usd_per_m: "21.0 in, 168.0 out, at openai on openrouter"
context: 400000
max_output: 128000
input: ["image", "text", "file"]
output: ["text"]
released: "2025-12-10"
reasoning: ["xhigh", "high", "medium"]
api: ["/api/v1/chat/completions", "/api/v1/completions", "/api/v1/messages", "/api/v1/responses"]
params: ["include_reasoning", "max_tokens", "reasoning", "reasoning_effort", "response_format", "seed", "stop", "structured_outputs", "temperature", "tool_choice", "tools", "verbosity"]
endpoints: 2
gateways: "openrouter (1), vercel (1)"
no_training: 2
trains: 0
retains_prompts: 1
---
# OpenAI: GPT-5.2 Pro

GPT-5.2 Pro is OpenAI’s most advanced model, offering major improvements in agentic coding and long context performance over GPT-5 Pro. It is optimized for complex tasks that require step-by-step reasoning,...