OpenAI GPT-6.1 Sol Ultrafast is available through the Responses API using model gpt-6.1-sol and service_tier=ultrafast. For prompts up to 272,000 input tokens, it costs USD 12 per 1M input tokens, USD 0.60 per 1M cached input tokens, and USD 60 per 1M output tokens; longer prompts cost USD 24/1M input and USD 90/1M output. Ultrafast supports global processing and US/EU data residency, with separate rate limits and regional processing surcharges.
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Use-case fit and limitations from the existing resource record.
Available
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