No longer available since 26 October 2026
LLMBase Chat focuses on open-weight models. GPT-5.1 Codex (High) is a proprietary model and has therefore not been available since 26 October 2026.
GPT-5.1 Codex (High)
Specifications
Benchmarks and key facts remain here for reference.
ProviderOpenai
Context WindowN/A
Release DateNov 13, 2025
ModalitiesText
Frequently Asked Questions
Is GPT-5.1 Codex (High) available in LLMBase Chat yet?
No. GPT-5.1 Codex (High) has not been available in LLMBase Chat since 26 October 2026.