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GPT-5.1 Codex (high)

New in 2026

Developed by OpenAI

API Pricing (per 1M tokens)

Input$1.25
Output$10.00

Intelligence Benchmarks

MMLU Pro86.0%
GPQA86.0%
Intelligence Index42.2
LivebenchN/A

Technical Specifications

Context Window400K Tokens
Vision SupportYes
Tokens per Second250
Time to First Token (s)15.42
Modalities
textimagefile->text