GPT-5.1 Chat

deprecated

GPT-5.1 Chat (AKA Instant is the fast, lightweight member of the 5.1 family, optimized for low-latency chat while retaining strong general intelligence. It uses adaptive reasoning to selectively “think” on...

128K context·$1.25 in·$10.00 out·Nov 2025 release·Vision, Reasoning, Tools / functions, Web search

Available on

OpenRouter

Providers

Where GPT-5.1 Chat runs in Big-AGI, with each service's own model ID and USD-per-1M-token rates. The summary above prefers the creator's claim; rates below are each service's own.

ServiceModel IDContextInputOutputCache read

OpenRouter

delisted

openai/gpt-5.1-chat

128K

$1.25

$10.00

$0.13

Specs as reported by each service · usage over the last 2 days · refreshed hourly