GPT-5.2 (Reasoning)

by OpenAI

GPT-5.2 (Reasoning) is a reasoning model from OpenAI, released on December 11, 2025. It has a 400K-token context window and can generate up to 128K output tokens. API pricing is $1.75 per 1M input tokens and $14 per 1M output tokens.

GPT‑5.2 introduces substantial gains in professional knowledge work, outperforming experts on GDPval with 70.9% wins or ties, and setting new highs in coding (SWE‑Bench Pro 55.6%), science (GPQA Diamond ~92–93%), math (AIME 2025: 100%), long‑context accuracy up to 256k tokens, and reliable tool‑calling (Tau2 Telecom 98.7%). It rolls out as Instant, Thinking, and Pro—faster, more structured, and less error‑prone—priced at $1.75/1M input and $14/1M output tokens, with Pro variants supporting xhigh reasoning for top‑quality, end‑to‑end execution.

Key specs

ProviderOpenAI
Release date2025-12-11
Licenseproprietary
Context window400K tokens
Max output128K tokens
Input price$1.75 / 1M tokens
Output price$14 / 1M tokens
Intelligence Score41.1
Coding index23.3

Quick answers

What is the context window of GPT-5.2 (Reasoning)?

GPT-5.2 (Reasoning) has a context window of 400K tokens, with a maximum output of 128K tokens per response.

How much does GPT-5.2 (Reasoning) cost?

GPT-5.2 (Reasoning) costs $1.75 per 1M input tokens and $14 per 1M output tokens through the API.

Is GPT-5.2 (Reasoning) open source?

No. GPT-5.2 (Reasoning) is a proprietary model from OpenAI (proprietary license).

When was GPT-5.2 (Reasoning) released?

OpenAI released GPT-5.2 (Reasoning) on December 11, 2025.

Compare on the AI leaderboard · All AI models

More models from OpenAI