GPT 5.5 (Fast)
GPT‑5.5 understands what you’re trying to do faster and can carry more of the work itself. It excels at writing and debugging code, researching online, analyzing data, creating documents and spreadsheets, operating software, and moving across tools until a task is finished. Instead of carefully managing every step, you can give GPT‑5.5 a messy, multi-part task and trust it to plan, use tools, check its work, navigate through ambiguity, and keep going. Your use is subject to OpenAI's Terms & Privacy Policies.
import { streamText } from 'ai'
const result = streamText({ model: 'openai/gpt-5.5-fast', prompt: 'Why is the sky blue?'})Copy link to headingPlayground
Try out GPT 5.5 (Fast) by OpenAI. Usage is billed to your team at API rates. Free users (those who haven't made a payment) get $5 of credits every 30 days.
GPT 5.5 (Fast)
GPT 5.5 (Fast)
Copy link to headingProviders
Route requests across multiple providers. Copy a provider slug to set your preference. Visit the docs for more info. Using a provider means you agree to their terms, listed under Legal.
Copy link to headingThroughput24 hours
P50 throughput on live AI Gateway traffic, in tokens per second (TPS). Visit the docs for more info.
Copy link to headingLatency24 hours
P50 time to first token (TTFT) on live AI Gateway traffic, in milliseconds. View the docs for more info.
Copy link to headingUptime24 hours
Direct request success rate on AI Gateway and per-provider. Uptime reflects the base model. Visit the docs for more info.
Copy link to headingMore models by OpenAI
| Model |
|---|
| 1.1M | 1.6s | 245tps | $1/M$0.20/M Fast $0.40/M+1 more | $6/M$1.20/M Fast $2.40/M+1 more | Read: $0.1/M$0.02/M+1 more Write: $1.25/M$0.25/M+1 more | $10/K + input costs | +4 |   | 07/09/2026 | ||||
| 1.1M | 1.9s | 120tps | $5/M$2.50/M Fast $5/M+1 more | $30/M$15/M Fast $30/M+1 more | Read: $0.5/M$0.25/M+1 more Write: $6.25/M$3.13/M+1 more | $10/K + input costs | +4 | | 07/09/2026 | ||||
| 1.1M | 1.1s | 168tps | $2.50/M$2/M Fast $4/M+1 more | $15/M$12/M Fast $24/M+1 more | Read: $0.25/M$0.2/M+1 more Write: $3.13/M$2.5/M+1 more | $10/K + input costs | +4 | | 07/09/2026 | ||||
| 1.1M | 0.8s | 87tps | $2.50/MFast $5/M+1 more | $15/MFast $30/M+1 more | Read: $0.25/M+1 more Write: — | $10/K + input costs | +4 | | 03/05/2026 | ||||
| 400K | 5.1s | 184tps | $0.05/M | $0.40/M | Read:$0.01/M Write:— | $14/K + input costs | +3 | | 08/07/2025 | ||||
| 131K | 0.1s | 378tps | $0.35/M | $0.75/M | Read:$0.25/M Write:— | — |   +5 | 08/05/2025 |