GPT-5.1

Sharper GPT-5 generation for coding, product work, and tool-assisted tasks

ECI STANDING#49 of 266
SCORE149.64148.45–151.03 CI
FRONTIER LAGLaunched 3.2 months behindScores about what GPT-5 did in August 2025.
Full Epoch Capabilities Index ranking

From the lab

Launch announcement · Nov 13, 2025Introducing GPT-5.1 for developersRelated article · Nov 12, 2025GPT-5.1: A smarter, more conversational ChatGPT
RELEASE DATENov 13, 2025
WEIGHTSClosed weights
CONTEXT WINDOW400K
MAX OUTPUT128K
REASONINGYes
TOOL CALLINGYes
INPUTStext, image
OUTPUTStext

Specifications from Models.dev. Availability and limits may differ by provider. Benchmark scores come from Epoch AI under CC BY 4.0.