GPT-5 Chat

JSON →
openai llm
text

A chat-optimized variant of GPT-5, fine-tuned for conversational interactions and instruction following.

context window 128K tokens
max output 16K tokens
input price $1.25 / 1M tokens
output price $10 / 1M tokens
streamingfunction-callingjson-modetool-usevisionprompt-cachingreasoning
releasedAug 2025
knowledge cutoffApr 2025
full doc /v1/models/gpt-5-chat