claude-opus-4.6-fast vs openai/gpt-5.5
Input price
$30.00
$5.00
Output price
$150.00
$30.00
Context window
1000K
1050K
Throughput
165 tok/s
155 tok/s
Availability
99.1%
98.2%
Cost / task
$0.135
$0.025
Efficiency score
82
82
Estimated monthly cost by workload
Metric
CLAUDE-OPUS-4.
OPENAI
Chat assistant
$27,000
$5,100
RAG / long context
$49,500
$8,700
Agent / tool use
$75,600
$14,400
Efficiency score: openai/gpt-5.5
Across price, speed and reliability, openai/gpt-5.5 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 claude-opus-4.6-fast or openai/gpt-5.5 cheaper?+
openai/gpt-5.5 has the lower input price — $5.00 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, claude-opus-4.6-fast or openai/gpt-5.5?+
Across price, speed and reliability, openai/gpt-5.5 offers the stronger overall balance for most workloads — but the right pick depends on your exact mix of input, output and latency needs.