GPT-4o (Fast)
Model details
- Model
openai/gpt-4o-fast- Provider
vercel-ai-gateway- API
anthropic-messages- Base URL
https://ai-gateway.vercel.sh- Input
- text, image
- Reasoning
- No
- Context window
- 128,000
- Max tokens
- 16,384
Show configuration
{
"providers": {
"vercel-ai-gateway": {
"apiKey": "YOUR_API_KEY",
"models": [
{
"id": "openai/gpt-4o-fast",
"name": "GPT-4o (Fast)",
"reasoning": false,
"input": [
"text",
"image"
],
"contextWindow": 128000,
"maxTokens": 16384,
"cost": {
"input": 4.25,
"output": 17,
"cacheRead": 2.125,
"cacheWrite": 0
},
"compat": {
"allowEmptySignature": true
}
}
],
"api": "anthropic-messages",
"baseUrl": "https://ai-gateway.vercel.sh"
}
}
}Pricing
USD per million tokens. A tier is selected from the total input tokens in each request and applies to that entire request.
| Request input | Input | Output | Cache read | Cache write |
|---|---|---|---|---|
| All requests | $4.25 | $17 | $2.125 | $0 |
Session cost calculator
Estimate the requests made during an agent session. A user turn can make several model calls while using tools, so costs are calculated per model request.
Estimated session$0.00
- Uncached input
- —
- Cache reads
- —
- Uncached prefixes
- —
- Cache writes
- —
- Output
- —
- Without caching
- —
The first request starts cold unless marked otherwise. Output is billed separately from context growth because reasoning tokens are not always retained. This remains a directional estimate: providers differ in eligibility, rounding, and retention.
Compatibility flags
Effective values after applying Pi's API defaults and model overrides.
| Feature | Value |
|---|---|
supportsEagerToolInputStreaming | Yes |
supportsLongCacheRetention | Yes |
sendSessionAffinityHeaders | No |
supportsCacheControlOnTools | Yes |
supportsTemperature | Yes |
forceAdaptiveThinking | No |
allowEmptySignature | Yes |