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cd8bd0a | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 | type JsonRecord = Record<string, unknown>;
/**
* Default models that support Anthropic Fast Mode (speed:"fast").
*
* Mirrors the binary-side gate observed in claude-code v2.1.145 (KT() check):
* only the latest Opus tiers can request the priority service path.
*/
export const CLAUDE_FAST_MODE_DEFAULT_MODELS = [
"claude-fable-5",
"claude-opus-4-8",
"claude-opus-4-7",
"claude-opus-4-6",
] as const;
function asRecord(value: unknown): JsonRecord {
return value && typeof value === "object" && !Array.isArray(value) ? (value as JsonRecord) : {};
}
function asStringArray(value: unknown): string[] | null {
if (!Array.isArray(value)) return null;
const out: string[] = [];
for (const item of value) {
if (typeof item === "string" && item.trim().length > 0) out.push(item.trim());
}
return out;
}
/**
* Returns true if the user has globally opted into Claude Fast Mode.
*
* Anthropic does not officially expose `speed:"fast"` via the public SDK; this
* toggle is only meaningful when paired with a CPA-side opt-in spoof that
* rewrites the entrypoint for SDK-shaped traffic. The flag is forwarded to CPA
* via the `X-CPA-Force-Fast-Mode` outbound header.
*/
export function isClaudeFastModeEnabled(settings: unknown): boolean {
const record = asRecord(settings);
const claudeFastMode = record.claudeFastMode;
if (typeof claudeFastMode === "boolean") return claudeFastMode;
const claudeFastModeRecord = asRecord(claudeFastMode);
return claudeFastModeRecord.enabled === true;
}
/**
* Returns the configured supported-model list, defaulting to the conservative
* Opus 4-8 / 4-7 / 4-6 set.
*/
export function getClaudeFastModeSupportedModels(settings: unknown): string[] {
const record = asRecord(settings);
const claudeFastMode = asRecord(record.claudeFastMode);
const fromSettings = asStringArray(claudeFastMode.supportedModels);
if (fromSettings && fromSettings.length > 0) return fromSettings;
return [...CLAUDE_FAST_MODE_DEFAULT_MODELS];
}
/**
* True when the toggle is on AND the model id prefix-matches a supported model.
* Prefix matching tolerates dated suffixes (e.g. claude-opus-4-8-20260528).
*/
export function shouldRequestClaudeFastMode(
settings: unknown,
modelId: string | null | undefined
): boolean {
if (!isClaudeFastModeEnabled(settings)) return false;
if (typeof modelId !== "string" || modelId.length === 0) return false;
const supported = getClaudeFastModeSupportedModels(settings);
return supported.some((m) => modelId === m || modelId.startsWith(`${m}-`));
}
/**
* Header used by CPA (claude-fastmode-spoof branch) to opt SDK-shaped traffic
* into Fast Mode entrypoint rewriting.
*/
export const CPA_FORCE_FAST_MODE_HEADER = "X-CPA-Force-Fast-Mode";
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