GPT-6.1 Sol gains Ultrafast mode
The accelerated service arrives for Sol in Responses API, Codex and ChatGPT Work; it is not a new model.
available
Facts, analysis and limits
Verified facts
- API: gpt-6.1-sol with service_tier: "ultrafast", for all API customers subject to limits.
- Codex/ChatGPT Work: Pro at 500 USD/month or some eligible Enterprise/Edu offers.
- Enterprise: access disabled by default.
- Inference residence announced in the United States and Europe.
What changes
An additional latency/cost arbitration for interactive workflows.
Practical implication
Measure cost per task and latency before changing the tier service.
Availability
API: global processing and US/EU residency. Codex/Work: announced European residency covers EEA + Switzerland, subject to eligibility.
Limits and uncertainty
Ultrafast tariffs and quotas; the initial release of Sol dates from September.