GPT-5.6 Terra with Pro reasoning mode. Pro mode performs more model work for difficult tasks; reasoning effort remains independently configurable and defaults to medium.
Added Jul 9, 2026
Context Window
1.1M
Max Output
128.0K
Input Price (Auto)
$1.00/1M
Output Price (Auto)
$6.00/1M
Cache Read (Auto)
$0.10/1M
Capabilities
Benchmarks
Benchmarks
Performance metrics and benchmarks
Sourced from Artificial Analysis.
Intelligence Index
56.6
Coding Index
76.7
Reasoning
GPQA Diamond
Graduate-level scientific reasoning
92.5%
Better than 96% of models compared
HLE
Humanity's Last Exam
42.9%
Better than 96% of models compared
IFBench
Instruction-following benchmark
71.2%
Better than 87% of models compared
T²-Bench Telecom
Conversational AI agents in dual-control scenarios
86.3%
Better than 79% of models compared
AA-LCR
Long context reasoning evaluation
79.7%
Better than 98% of models compared
Coding
SciCode
Python programming for scientific computing
53.9%
Better than 96% of models compared
Terminal-Bench Hard
Agentic coding and terminal use
57.6%
Better than 97% of models compared
Last updated Aug 16, 2026
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