GPT-5.6 Terra
Balanced GPT-5.6 model for capable, cost-efficient everyday work
ECI STANDING#7 of 266
SCORE159.14157.01–161.84 CI
FRONTIER LAGLaunched 2.5 months behindScores about what GPT-5.5 Pro did in April 2026.
SCORES LIKE THESE MODELSGPT-5.5OpenAI · Apr 2026159.12GPT-5.4 ProOpenAI · Mar 2026158.95Claude Opus 4.8Anthropic · May 2026158.3Kimi K3Moonshot · Jul 2026157.63
Full Epoch Capabilities Index ranking ↗From the lab
Launch announcement · Jul 9, 2026GPT-5.6: Frontier intelligence that scales with your ambitionRELEASE DATEJul 9, 2026
WEIGHTSClosed weights
CONTEXT WINDOW1.05M
MAX OUTPUT128K
REASONINGYes
TOOL CALLINGYes
INPUTStext, image, pdf
OUTPUTStext
Specifications from Models.dev. Availability and limits may differ by provider. Benchmark scores come from Epoch AI under CC BY 4.0.