OpenAI has added GPT-6.1 Sol to its Ultrafast service tier, the company announced October 8. The speed tier is rolling out across the API, Codex and ChatGPT Work, costing $12 per million input tokens and $60 per million output tokens — six times the model's standard $2/$10 rates.

OpenAI positions Ultrafast as a latency line item for interactive and agentic workloads: up to 6x faster token generation in the API and up to 8x in Codex compared with Sol Standard. The launch completes the rollout previewed September 29, when OpenAI introduced GPT-6.1 Sol as a lower-cost model for coding and professional work and said the faster mode would follow within days.

Sol Ultrafast joins Astra Ultrafast, which shipped at DevDay with the $500 Pro 500 plan. Teams now have to decide which workloads merit the speed premium — inference latency is becoming a product feature with its own price tag.