What is the context window of GPT-5.1?

GPT-5.1 has a context window of 262144 tokens.

When was GPT-5.1 released?

GPT-5.1 was released on 2025-11-13.

GPT-5.1

Name: GPT-5.1
Author: OpenAI

Deprecated

ProprietaryMultimodal

About

OpenAI's GPT-5.1 is the main thinking model in the GPT-5.1 family, released November 13, 2025 via API (ChatGPT rollout began November 12, 2025). Features adaptive reasoning that dynamically adjusts thinking time by task complexity, with a reasoning_effort parameter supporting none/low/medium/high settings. Deprecated in ChatGPT as of March 11, 2026 in favor of newer models.

Capabilities

VisionMultimodalReasoningFunction CallingTool UseStructured OutputsCode Execution

Rankings

Best Multimodal / Vision LLMs Best LLMs for Reasoning & Math Best LLMs for Function Calling & Tool Use

Specifications

FamilyGPT-5.1

Released2025-11-13

Context262K

Created by

OpenAI

Cutting-edge research and development.

San Francisco, California, United States

Founded 2015

Website

Links

Website