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Model Timeline

Timeline of gpt-5.1

Every recorded change for this model by OpenAI, newest first. Back to the entity page →

3 events

Year

All years 2026

Category · events in the last 365 days

All categories Benchmarks4,947 Models2,337 Companies1,601 Research1,104 Releases1,019 Providers & pricing640 Datasets146 Frameworks136 Hardware43 Pricing14 Repositories10

Filtered to one entity. Show the whole atlas

Sept 20263

Sept 2026 3

12 Sept 2026
Context window changedModelgpt-5.1OpenAI
gpt-5.1: context length changed from 272000 to 400000
Context window272K tokens→400K tokensopenrouter

openrouter.ai

11 Sept 2026

Context window changedModelgpt-5.1OpenAI

gpt-5.1: context length changed from 400000 to 272000

Context window400K tokens→272K tokensartificial_analysis

artificialanalysis.ai

11 Sept 2026

New modelModelgpt-5.1OpenAI

New model: gpt-5.1 (OpenAI)

openai

developers.openai.com

Showing up to 400 events. Narrow by year or category, or use the changes feed for cursor-paged history. Times are UTC.