GPT-5.4 Pro

More exact GPT-5.4 tier for demanding professional reasoning and agent tasks

ECI STANDING#9 of 266
SCORE158.95156.73–161.7 CI
FRONTIER LAGLaunched in the leadNothing released before it had scored higher.
Full Epoch Capabilities Index ranking
RELEASE DATEMar 5, 2026
WEIGHTSClosed weights
CONTEXT WINDOW1.05M
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.