Specs
On paper
| GPT-5.4 Pro | Claude Fable 5 | |
|---|---|---|
| Modality | Chat | Chat |
| Context | 256K | 1M |
| Max output | 16K | 128K |
| Price | $0.37typical | $0.112typical |
| Metered input | $33.60/M tok | $11.20/M tok |
| Metered output | $201.60/M tok | $56.00/M tok |
| Providers | 1 | 2 |
| Streaming | ||
| JSON mode | ||
| Tool calling |
Live performance
On our traffic
Each curve is one model, measured on the same network, the same days.
Response latencymedian per day
Collecting live data — a point is recorded for every day of traffic.
Output speedtokens / second
Collecting live data — a point is recorded for every day of traffic.
Uptimesuccessful of gradable
Collecting live data — a point is recorded for every day of traffic.
Requests / dayvolume served
Collecting live data — a point is recorded for every day of traffic.
GPT-5.4 ProClaude Fable 5
Run both. Route to the winner.
One key serves every model here — swap the model string, keep your code.
Get an API key