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feat: back model benchmark with Braintrust, drop in-house scoring

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Braintrust now owns benchmark scoring, experiments, comparison, and
reporting. GStack keeps only the CLI-agent adapters (the unavoidable shim)
plus operational metrics the CLIs report. runProviderBenchmark wraps each
adapter as a Braintrust Eval task; a deterministic required-terms scorer
replaces the in-house evaluation logic and the optional autoevals ClosedQA
judge replaces judge.ts.

Runs local by default under bun: with no BRAINTRUST_API_KEY it sets
noSendLogs and ships nothing; setting the key opts into the cloud dashboard.
An empty output with zero tokens is thrown so a silent auth/CLI failure
can't masquerade as a 0.0 score.

Deletes runner.ts and judge.ts (and their test-helper re-export shims);
rewires bin/gstack-model-benchmark and adapts the benchmark tests.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Sinabina
2026-07-21 14:12:10 -07:00
co-authored by Claude Opus 4.8
parent e71e7f7f41
commit 36f972f2e4
12 changed files with 321 additions and 470 deletions
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evals/model-benchmark/gstack.eval.ts
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/**
* GStack model benchmark — Braintrust entrypoint for `bun run` / CI.
*
* Braintrust owns scoring, comparison, and reporting. See
* lib/model-benchmark/braintrust-eval.ts for the core; the user-facing CLI is
* bin/gstack-model-benchmark.
*
* Local run, nothing leaves the machine:
* GSTACK_BENCH_PROVIDER=claude bun run evals/model-benchmark/gstack.eval.ts
*
* Opt into the Braintrust dashboard (consent-gated cloud):
* export BRAINTRUST_API_KEY=...
* for p in claude gpt gemini; do GSTACK_BENCH_PROVIDER=$p bun run evals/model-benchmark/gstack.eval.ts; done
*/
import { loadCorpus, runProviderBenchmark, type ProviderName } from '../../lib/model-benchmark/braintrust-eval';
const provider = (process.env.GSTACK_BENCH_PROVIDER ?? 'claude') as ProviderName;
const timeoutMs = Number(process.env.GSTACK_BENCH_TIMEOUT_MS ?? 300_000);
const judge = process.env.GSTACK_BENCH_JUDGE === '1';
await runProviderBenchmark(provider, loadCorpus(), { timeoutMs, judge });