GPT-5
OpenAI · August 2025
● activeClosedsparse moemultimodalAPI Available
Parameters~200B (MoE)
Context Window400K tokens
Why It Matters
Marked OpenAI's shift to efficient sparse architectures, proving that smarter routing of computation matters more than raw parameter count. Unified the GPT and o-series reasoning capabilities into a single model.
Description
OpenAI's next-generation flagship using a sparse mixture-of-experts architecture (where only a fraction of the model's parameters activate for each query, making it efficient despite its size). Features a unified reasoning system and 400K token context window. Replaced the GPT-4 line as OpenAI's premier model.
Key Innovations
MoE
MoEArchitecture where only a fraction of the model's parameters are active for each input, allowing massive scale with lower compute.
Reasoning
ReasoningStructured step-by-step problem solving, often using chain-of-thought or tree-of-thought approaches.
Agentic
AgenticModels that can autonomously plan, execute multi-step tasks, use tools, and self-correct without human intervention.
Family Tree
Built On
Lineage
Successors (1)
Enabled By
B100 / B200NVIDIA · March 2024
2.5x H100