Adds the full spec Codex asked for: real provider adapters with auth
detection, normalized RunResult, pricing tables, tool compatibility
maps, parallel execution with error isolation, and table/JSON/markdown
output. Judge stays on Anthropic SDK as the single stable source of
quality scoring, gated behind --judge.
Codex flagged the original plan as massively under-scoped — the
existing runner is Claude-only and the judge is Anthropic-only. You
can't benchmark GPT or Gemini without real provider infrastructure.
This commit ships it.
New architecture:
test/helpers/providers/types.ts ProviderAdapter interface
test/helpers/providers/claude.ts wraps `claude -p --output-format json`
test/helpers/providers/gpt.ts wraps `codex exec --json`
test/helpers/providers/gemini.ts wraps `gemini -p --output-format stream-json --yolo`
test/helpers/pricing.ts per-model USD cost tables (quarterly)
test/helpers/tool-map.ts which tools each CLI exposes
test/helpers/benchmark-runner.ts orchestrator (Promise.allSettled)
test/helpers/benchmark-judge.ts Anthropic SDK quality scorer
bin/gstack-model-benchmark CLI entry
test/benchmark-runner.test.ts 9 unit tests (cost math, formatters, tool-map)
Per-provider error isolation:
- auth → record reason, don't abort batch
- timeout → record reason, don't abort batch
- rate_limit → record reason, don't abort batch
- binary_missing → record in available() check, skip if --skip-unavailable
Pricing correction: cached input tokens are disjoint from uncached
input tokens (Anthropic/OpenAI report them separately). Original
math subtracted them, producing negative costs. Now adds cached at
the 10% discount alongside the full uncached input cost.
CLI:
gstack-model-benchmark --prompt "..." --models claude,gpt,gemini
gstack-model-benchmark ./prompt.txt --output json --judge
gstack-model-benchmark ./prompt.txt --models claude --timeout-ms 60000
Output formats: table (default), json, markdown. Each shows model,
latency, in→out tokens, cost, quality (when --judge used), tool calls,
and any errors.
Known limitations for v1:
- Claude adapter approximates toolCalls as num_turns (stream-json
would give exact counts; v2 can upgrade).
- Live E2E tests (test/providers.e2e.test.ts) not included — they
require CI secrets for all three providers. Unit tests cover the
shape and math.
- Provider CLIs sometimes return non-JSON error text to stdout; the
parsers fall back to treating raw output as plain text in that case.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Garry Tan