This page may contain stale information. Last updated: 2026-08-14
Definition
Ultrafast is an OpenAI API service tier for gpt-5-6-sol that serves the same model at substantially higher output token rates using cerebras wafer-scale-engine hardware.
Key Points
- Launch: Aug 13, 2026 — limited preview for select API customers
- Claims: up to 750 output tokens/sec; up to 14× Standard
- Vendor: same intelligence as Standard; GDP-Val 5.6× end-to-end with no quality loss
- Competitive framing vs claude-opus-4-8 Fast and claude-fable-5 (Artificial Analysis–cited)
- Target workloads: incident response, support, financial analysis, e-commerce
Speed and "no quality loss" claims are vendor / Artificial Analysis cited — treat as claimed until independently verified. Pricing undisclosed.