In the Arena, GPT-5's home is Codex. Running it anywhere else costs you the +12 Precision synergy and feels like you're paying for a feature you're not using.
OpenAI · cloud-model
Verified 5mo ago
OpenAI GPT-5
OpenAI's 2025 flagship, now a previous model.
OpenAI's GPT-5, released August 2025. OpenAI's model docs now list it as a previous model; the current flagship is GPT-6 Astra (September 2026). Until 2026-09-24 this page was titled GPT-5 Core, a name OpenAI never used.
Specs
- tool use
- native, multi-agent
Buy
- OpenAI ↗
Direct API access. No affiliate relationship.