GPT-5.2 Pro

GPT-5.2 Pro is a higher-accuracy variant of GPT-5.2 for tougher reasoning and review workflows. It is part of the gpt-pro line and was released on 2025-12-11. It has a 400,000-token context window and a 128,000-token maximum output. Pricing starts at $18.90 per million input tokens and $150.00 per million output tokens. Weights are not open. It supports reasoning mode and tool calling, and accepts image and text inputs, returning text. Knowledge cutoff is 2025-08-31.

Against GPT-5 Pro: input $13.50 to $18.90, output $108.00 to $150.00.

Range across the hosts that serve it: up to $21.00 per 1M input tokens.

• ·400k token context window for long documents
• ·128k token max output for extensive responses
• ·Reasoning mode for complex problem solving
• ·Tool calling for external integrations
• ·Accepts image and text inputs

• Reach for it for multi-step reasoning with tool calls
• Reach for it for reviewing long documents up to 400k tokens
• Reach for it for generating extended outputs up to 128k tokens
• Reach for it for image-plus-text reasoning tasks

11 hosts serve this model at the price above · the maker's documentation

The registry keeps the six most recent versions of a line. Older ones stay in the file and can be surfaced without a rebuild.

What is the context window and max output?

Context window is 400,000 tokens, max output is 128,000 tokens.

Does it support image input?

Yes, it accepts image and text inputs, and returns text.

Is it open weights?

No, weights are not open.