Longest-Context OpenAI Models

Quick answer · Updated June 2026

GPT-5.5 Pro has the largest context window of any OpenAI model, at 1.1M tokens. GPT-5.5 (1.1M) and GPT-5.4 Pro (1.1M) round out the top three.

1.1MContext

15 t/sSpeed

$30.00Input /M

AI models with the largest context windows, ranked by token capacity. The best large language models for long documents, codebases and extended conversations.

Frequently asked

Which OpenAI model has the largest context window?

GPT-5.5 Pro has the largest context window of any OpenAI model, at 1.1M tokens. GPT-5.5 (1.1M) and GPT-5.4 Pro (1.1M) round out the top three.

What's a good alternative to GPT-5.5 Pro?

GPT-5.5 (1.1M) is the closest alternative on this metric, followed by GPT-5.4 Pro (1.1M). See the full ranking above for the tradeoffs.

How many OpenAI models are there?

modelgrep tracks 62 OpenAI models with live benchmarks, speed, latency and per-provider pricing, led on intelligence by GPT-5.4. 25 of them qualify for this ranking.

More OpenAI rankings

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All rankings

Small & Fast LLMs Smartest LLMs Best LLMs for Coding Best LLMs for Design & Frontend Fastest LLMs Lowest-Latency LLMs Cheapest LLMs Best Free LLMs Best Reasoning LLMs Best Vision LLMs Best LLMs for Agents Best Open-Source LLMs