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fix(harness): disable pi thinking config (unblocks the pi run) #43

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Merged
itelo merged 1 commit into from
Aug 21, 2026
Merged

fix(harness): disable pi thinking config (unblocks the pi run) #43

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9 changes: 8 additions & 1 deletion src/lib/steps/harness/pi.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -59,7 +59,14 @@ export const piHarness: Harness = {
name: modelId,
api: 'anthropic-messages',
baseUrl: inference.base_url,
reasoning: true,
// Must be false: pi-ai emits the deprecated `thinking:{type:'enabled',
// budget_tokens}` for reasoning models, which Opus 4.8 / Sonnet 5
// reject with a 400 (they only accept `thinking:{type:'adaptive'}`).
// With reasoning on, every request errored server-side → 0 tool calls,
// empty diff. Off means no extended thinking on the pi path, but the
// requests succeed. (The anthropic control uses the SDK's adaptive form;
// thinking parity needs a newer pi-ai.)
reasoning: false,
input: ['text'],
cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
contextWindow: 1_000_000,
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