OpenAI's new Ultrafast API runs 14x faster on Cerebras, beating Claude
eyishazyer · x · 2026-08-15
Cerebras claims its chips make OpenAI 11x faster than Claude.
- New API Tier: OpenAI launched a limited preview called Ultrafast, running GPT-5.6 Sol on Cerebras hardware at 750 tokens/second, 14x faster than standard processing.
- Benchmarks: On the Humanity's Last Exam, GPT-5.6 Sol finished 2,500 questions in just over 11 hours, while Claude Fable 5 took more than three days.
- Use Cases: Ultra-fast speeds are critical for latency-sensitive products like voice, support, and coding agents.
Note: All figures are sourced from Cerebras, not independently verified.
Related event: OpenAI Previews Ultrafast Mode for GPT-5.6 Sol, 14x Faster via Cerebras(18 posts)→
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