GPT-4.1

Claims and evidence

• Released 14 April 2025 ● Primary source[1]introduction [3]Apr 14, 2025

• Status Availablegpt-4.1 is not on the deprecations page when read on 2026-10-01; its docs page is live and not marked deprecated. ● Primary source[2]Model details [4]Upcoming and past deprecations (gpt-4.1 not listed)

• Successor of GPT-4oThe announcement says the GPT-4.1 models outperform GPT-4o and GPT-4o mini across the board and that many of the improvements were folded into GPT-4o in ChatGPT; it does not use the word successor. ● Primary source[1]introduction

• Change · Context length Context window of up to one million tokens (1,047,576 in the API docs), larger than GPT-4o's.Compared with GPT-4o ● Primary source[1] [2]
• Change · Other Maximum output raised to 32,768 tokens, from 16,384 for GPT-4o.Compared with GPT-4o ● Primary source[1]
• Change · Training data Knowledge cutoff moved to June 2024.Compared with GPT-4o ● Primary source[1]
• Change · Availability Released as a series of three sizes, adding a nano tier below mini; at launch only in the API.Compared with GPT-4o ● Primary source[1]

• Input text, image ● Primary source[2]Model details
• Output text ● Primary source[2]Model details
• Context window 1,047,576 tokensThe announcement gives up to 1 million tokens for all three models. ● Primary source[2]Model details
• Parameters Not disclosedNot disclosed by OpenAI. No claim madeNo source
• Access API, consumer appAPI only at launch. The GPT-5 announcement later names GPT-4.1 among the ChatGPT models GPT-5 replaced for signed-in users, so it had been added to ChatGPT in the meantime. ● Primary source[1]introduction [5]How to use GPT-5

Lineage

Variants

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