GPT-5 Chat
JSON →A chat-optimized variant of GPT-5, fine-tuned for conversational interactions and instruction following.
Specs
context window 128K tokens
max output 16K tokens
input price $1.25 / 1M tokens
output price $10 / 1M tokens
Capabilities
streamingfunction-callingjson-modetool-usevisionprompt-cachingreasoning
Dates
releasedAug 2025
knowledge cutoffApr 2025
Resources
API
full doc /v1/models/gpt-5-chat