Private AI
GPT-5 Codex is a coding-focused variant of GPT-5 built for interactive development and long-running, autonomous engineering work. It excels at feature implementation, debugging, large-scale refactors, and code review, with higher steerability and tighter adherence to developer instructions for cleaner, production-ready code.
Context Window
256.0K
Max Output
32.8K
Input Price (Auto)
$1.25/1M
Output Price (Auto)
$10.00/1M
Cache Read (Auto)
$0.13/1M
Performance metrics and benchmarks
Sourced from Artificial Analysis.
Intelligence Index
36.1
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GPQA Diamond
Graduate-level scientific reasoning
83.7%
Better than 79% of models compared
HLE
Humanity's Last Exam
25.6%
Better than 84% of models compared
IFBench
Instruction-following benchmark
74.1%
Better than 92% of models compared
T²-Bench Telecom
Conversational AI agents in dual-control scenarios
86.8%
Better than 80% of models compared
AA-LCR
Long context reasoning evaluation
69.0%
Better than 90% of models compared
SciCode
Python programming for scientific computing
40.9%
Better than 76% of models compared
Terminal-Bench Hard
Agentic coding and terminal use
37.9%
AIME 2025
American Invitational Mathematics Examination 2025
98.7%
Better than 99% of models compared
MMLU-Pro
Professional and academic subject knowledge
86.5%
Better than 95% of models compared
Last updated Aug 4, 2026
Artificial AnalysisBetter than 85% of models compared
LiveCodeBench
Contamination-free coding benchmark
84.0%
Better than 95% of models compared
