GPT‑5.2 Pro
GPT‑5.2 Pro is a text generation model from OpenAI with a 400,000-token context window and adjustable reasoning effort.
OpenAIFlagship reasoning with tools and MCP support
GPT‑5.2 Pro is OpenAI's flagship large language model, released in December 2025. It supports a 400,000-token context window and can generate responses up to 256,000 tokens, making it suited for tasks that involve long documents, extended conversations, or complex multi-step workflows. The model accepts image inputs alongside text and exposes a configurable reasoning effort setting, allowing developers to trade off response latency against depth of reasoning.
GPT‑5.2 Pro is designed for use cases that benefit from tool use and agent-style orchestration. It natively supports external tools and MCP (Model Context Protocol) servers, enabling integration with APIs, databases, and other services without custom middleware. These characteristics make it a practical choice for building autonomous agents, document analysis pipelines, and applications that require the model to take actions or retrieve information from external systems.
What GPT‑5.2 Pro supports
Extended Context Window
Processes up to 400,000 tokens of input in a single request, enabling analysis of long documents, codebases, or multi-turn conversation histories.
Adjustable Reasoning Effort
Exposes a reasoning effort selector that lets developers tune how deeply the model reasons before responding, balancing speed against thoroughness.
Tool Use
Supports structured tool calling, allowing the model to invoke external functions or APIs and incorporate their results into its response.
MCP Server Integration
Accepts Model Context Protocol server configurations as a first-class input, enabling direct connection to MCP-compatible data sources and services.
Image Understanding
Accepts image inputs alongside text, supporting tasks such as document parsing, diagram interpretation, and visual question answering.
Large Response Output
Can generate responses of up to 256,000 tokens, suitable for producing long-form documents, detailed reports, or extensive code files in a single call.
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Get Started FreeBenchmark scores
Scores represent accuracy — the percentage of questions answered correctly on each test.
| Benchmark | What it tests | Score |
|---|---|---|
| MMLU-Pro | Expert knowledge across 14 academic disciplines | 87.4% |
| GPQA Diamond | PhD-level science questions (biology, physics, chemistry) | 90.3% |
| LiveCodeBench | Real-world coding tasks from recent competitions | 88.9% |
| HLE | Questions that challenge frontier models across many domains | 35.4% |
| SciCode | Scientific research coding and numerical methods | 52.1% |
| AIME 2025 | American math olympiad problems (2025) | 100.0% |
| SWE-bench Verified | Real GitHub issues requiring multi-file code fixes | 80.0% |
| SWE-bench Pro | Challenging real-world software engineering tasks | 55.6% |
| ARC-AGI-2 | Novel abstract reasoning and pattern recognition | 52.9% |
| τ²-bench Telecom | Agentic tool use in telecom scenarios | 94.5% |
Common questions about GPT‑5.2 Pro
What is the context window for GPT‑5.2 Pro?
GPT‑5.2 Pro supports a context window of 400,000 tokens, meaning the combined length of your input and conversation history can be up to 400,000 tokens per request.
How large can GPT‑5.2 Pro's responses be?
The model can generate responses of up to 256,000 tokens in a single call, which is suitable for producing lengthy documents, reports, or code outputs.
What is the Reasoning Effort setting?
Reasoning Effort is a configurable input that controls how much internal reasoning the model performs before generating a response. Higher effort may improve answer quality on complex tasks at the cost of increased latency.
Does GPT‑5.2 Pro support tool calling and external integrations?
Yes. The model supports structured tool use and also accepts MCP (Model Context Protocol) server configurations, allowing it to connect to external APIs, databases, and services directly.
When was GPT‑5.2 Pro released?
GPT‑5.2 Pro was released in December 2025 and was added to MindStudio on December 11, 2025.
What people think about GPT‑5.2 Pro
Community reception to GPT-5.2 Pro has been broadly positive, with the r/ChatGPT announcement thread accumulating over 1,700 upvotes and nearly 500 comments shortly after release. Users have highlighted its reasoning depth, with one r/singularity thread reporting that the model independently derived a novel result in theoretical physics.
Discussion in the singularity thread has focused on the model's performance on open-ended scientific and research tasks, drawing significant engagement with 692 upvotes and 163 comments. Some community members have raised questions about reproducibility and the scope of such results, reflecting ongoing interest in understanding the model's limits.
Parameters & options
Used to give the model guidance on how many reasoning tokens it should generate before creating a response to the prompt. Low will favor speed and economical token usage, and high will favor more complete reasoning at the cost of more tokens generated and slower responses. The default value is medium, which is a balance between speed and reasoning accuracy.
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