GPT-5.3 Chat vs GPT-5.5 Pro
Input price
$1.75
$30.00
Output price
$14.00
$180.00
Context window
128K
1050K
Throughput
152 tok/s
139 tok/s
Availability
100.0%
100.0%
Cost / task
$0.011
$0.150
Efficiency score
83
82
Estimated monthly cost by workload
Metric
GPT-5.3-CHAT
GPT-5.5-PRO
Chat assistant
$2,205
$30,600
RAG / long context
$3,360
$52,200
Agent / tool use
$6,300
$86,400
Efficiency score: GPT-5.3 Chat
Across price, speed and reliability, GPT-5.3 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-5.3 Chat or GPT-5.5 Pro cheaper?+
GPT-5.3 Chat has the lower input price — $1.75 vs $30.00 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-5.3 Chat or GPT-5.5 Pro?+
Across price, speed and reliability, GPT-5.3 Chat offers the stronger overall balance for most workloads — but the right pick depends on your exact mix of input, output and latency needs.