GPT 5.1 Thinking (Fast)
OpenAI
An upgraded version of GPT-5 that adapts thinking time more precisely to the question to spend more time on complex questions and respond more quickly to simpler tasks.
- Language
- File input
- Implicit caching
- Reasoning
- Tool use
- Vision
- Web search
- Fast
- Context
- 400K
- Max output
- 128K
- Input / 1M
- $2.50
- Output / 1M
- $20.00
Quickstart
Point any OpenAI-compatible client at Maxynetic Systems and pass openai/gpt-5.1-thinking-fast as the model.
curl https://api.maxynetic.com/v1/chat/completions \
-H "Authorization: Bearer $MAXYNETIC_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "openai/gpt-5.1-thinking-fast",
"messages": [{ "role": "user", "content": "Explain routing in one line." }]
}'Pricing
Billed per token with no markup on the underlying provider rate.
Input
Per 1M prompt tokens
$2.50
Output
Per 1M completion tokens
$20.00
Cache read
Per 1M cached prompt tokens
$0.250
A 1M-token prompt with 250K tokens of output costs about $7.50.