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feat(Inference): disable extended-thinking budget for fast/snap-judgment calls #1348

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feat(Inference): disable extended-thinking budget for fast/snap-judgment calls #1348

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24 changes: 22 additions & 2 deletions Releases/v5.0.0/.claude/PAI/TOOLS/Inference.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -25,9 +25,10 @@
* --auto-state v3.24 P5: Auto-synthesize state from current ISA + recent activity (advisor mode only, 2 positional args: task, question)
* --json Expect and parse JSON response
* --timeout <ms> Custom timeout (default varies by level)
* --no-thinking Disable the extended-thinking budget (snap-judgment latency); implied by --level fast
*
* DEFAULTS BY LEVEL:
* fast: model=haiku, timeout=15s
* fast: model=haiku, timeout=15s, thinking=off
* standard: model=sonnet, timeout=30s
* smart: model=opus, timeout=90s
* advisor: model=opus, timeout=120s
Expand Down Expand Up @@ -71,6 +72,12 @@ export interface InferenceOptions {
* are prepended to the user prompt as @-references so Claude reads them as
* image attachments. Routes through subscription like all other inference. */
imagePaths?: string[];
/** Set to `false` to disable the extended-thinking budget for this call (sets
* MAX_THINKING_TOKENS=0 in the subprocess env). Every `claude --print` call
* otherwise silently spends a thinking budget — measured ~14.9s vs ~3.2s on a
* snap-judgment classification payload, with model tier nearly irrelevant.
* Implicitly disabled for `level: 'fast'`. */
thinking?: boolean;
}

export interface InferenceResult {
Expand Down Expand Up @@ -116,6 +123,15 @@ export async function inference(options: InferenceOptions): Promise<InferenceRes
delete env.ANTHROPIC_API_KEY;
delete env.ANTHROPIC_AUTH_TOKEN;

// Disable the extended-thinking budget for latency-sensitive calls. Every
// `claude --print` subprocess otherwise silently spends a thinking budget
// (measured ~14.9s vs ~3.2s on a snap-judgment classification payload, with
// model tier nearly irrelevant). `fast` is a snap judgment by definition;
// other levels opt out explicitly with `thinking: false`.
if (level === 'fast' || options.thinking === false) {
env.MAX_THINKING_TOKENS = '0';
}

const hasImages = options.imagePaths && options.imagePaths.length > 0;
const args = [
'--print',
Expand Down Expand Up @@ -414,6 +430,7 @@ async function main() {
let expectJson = false;
let timeout: number | undefined;
let level: InferenceLevel = 'standard';
let noThinking = false;
let mode: 'inference' | 'advisor' = 'inference';
let autoState = false; // v3.24 P5
const positionalArgs: string[] = [];
Expand Down Expand Up @@ -444,6 +461,8 @@ async function main() {
} else if (args[i] === '--timeout' && args[i + 1]) {
timeout = parseInt(args[i + 1], 10);
i++;
} else if (args[i] === '--no-thinking') {
noThinking = true;
} else {
positionalArgs.push(args[i]);
}
Expand Down Expand Up @@ -483,7 +502,7 @@ async function main() {
}

if (positionalArgs.length < 2) {
console.error('Usage: bun Inference.ts [--level fast|standard|smart] [--json] [--timeout <ms>] <system_prompt> <user_prompt>');
console.error('Usage: bun Inference.ts [--level fast|standard|smart] [--json] [--timeout <ms>] [--no-thinking] <system_prompt> <user_prompt>');
process.exit(1);
}

Expand All @@ -495,6 +514,7 @@ async function main() {
level,
expectJson,
timeout,
thinking: noThinking ? false : undefined,
});

if (result.success) {
Expand Down