OpenAI's Ultrafast service tier (service_tier="ultrafast") is broadly
available for GPT-6 Astra in the API and Codex (Pro 500 / Enterprise),
billed at 6x Standard. GPT-6.1 Sol Ultrafast is announced as coming soon.
- One tier table: agent.fast_mode.parse_service_tier / STATIC_TIERS now
back the CLI, gateway and TUI config loaders (three hand-copied parsers).
- resolve_fast_mode_overrides(tier="ultrafast") sends the tier only for
Ultrafast models on api.openai.com / chatgpt.com; anything else gets
nothing rather than a silent swap to another paid tier.
- /fast ultrafast on CLI, gateway (typed + picker when supported) and TUI;
static-tier attach sites pass the tier through.
- Pricing: the response's SERVED service_tier is folded into usage (Codex
stream assembler keeps it); served ultrafast prices from a published
6x row (272K whole-request tier included). A request asking for
Ultrafast but served at default bills at Standard.
- i18n: 4 new keys in all 17 locales; option lists mention ultrafast.
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