gpt-5.1-chat vs gpt-5-chat
Input price
$1.25
$1.25
Output price
$10.00
$10.00
Context window
128K
128K
Throughput
170 tok/s
172 tok/s
Availability
100.0%
100.0%
Cost / task
$0.008
$0.008
Efficiency score
85
85
Estimated monthly cost by workload
Metric
GPT-5.1-CHAT
GPT-5-CHAT
Chat assistant
$1,575
$1,575
RAG / long context
$2,400
$2,400
Agent / tool use
$4,500
$4,500
Efficiency score: gpt-5.1-chat
Across price, speed and reliability, gpt-5.1-chat offers the stronger overall balance for most workloads — but the right pick depends on your exact mix of input, output and latency needs.
Figures are illustrative demo data, not financial advice.
Frequently asked questions
Is gpt-5.1-chat or gpt-5-chat cheaper?+
gpt-5.1-chat has the lower input price — $1.25 vs $1.25 per 1M tokens — so for most blended workloads it is the more cost-effective of the two. Figures are illustrative demo data.
Which should I choose, gpt-5.1-chat or gpt-5-chat?+
Across price, speed and reliability, gpt-5.1-chat offers the stronger overall balance for most workloads — but the right pick depends on your exact mix of input, output and latency needs.