Which agents work with it?

Any agent that reads skills from a directory. Claude Code, Codex and Gemini CLI read it natively; Cursor and VS Code connect over MCP.

The voice runs on your own machine, so there is nothing to meter. The first run downloads it, about 340 MB.

Yes. The skill is MIT-licensed and the authoring format is public.

gstack now runs its eval cases on Codex every Monday, beside Claude Opus 5.5

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gstack 1.91.147.0 to 1.91.149.0: gstack's paid eval cases now run on Codex, and the Monday census runs Claude Opus 5.5 and Codex gpt-6.1-sol side by side. On its first pilot Codex passed 48 of 52 gate cases at about a sixth of the cost; Claude-only cases are skipped, never failed. Release notes 1.91.149.0: https://github.com/garrytan/gstack/blob/main/CHANGELOG.md#1911490---2026-10-19 Release notes 1.91.148.0: https://github.com/garrytan/gstack/blob/main/CHANGELOG.md#1911480---2026-10-19 Release notes 1.91.147.0: https://github.com/garrytan/gstack/blob/main/CHANGELOG.md#1911470---2026-10-19 Commits: https://github.com/garrytan/gstack/commits/main

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Codex

gstack now runs its eval cases on Codex every Monday, beside Claude

claude-opus

Claude Opus 5.5

codex-sol

Codex · gpt-6.1-sol

CodexPilotClaude-onlyMonthlyTry it

garrytan/gstack · CHANGELOG.md · 1.91.149.0

gstack's paid eval cases can now run on Codex, each one through a full Codex runtime. Every Monday the census runs two arms side by side: Claude Opus 5.5, and Codex on gpt-6.1-sol.

Pilot

On its first run, Codex passed 48 of 52 gate cases at a sixth of the cost

48 / 52

gate cases passed on gpt-6.1-sol, no retries

$4.63

for the 52 cases, against $28.93 on Claude Fable

CodexPilotClaude-onlyMonthlyTry it

garrytan/gstack · CHANGELOG.md · 1.91.149.0

On its first pilot, Codex cleared 48 of the 52 gate cases with no retries. The whole run cost about a sixth of the same cases on Claude Fable.

Claude-only

Claude-only cases skip on Codex and never count as failed

52 adapter-only gate cases

run on Codex

26 rework cases

stay Claude-only

thresholds and Claude verdicts

unchanged

CodexPilotClaude-onlyMonthlyTry it

garrytan/gstack · CHANGELOG.md · 1.91.149.0

Cases that need Claude are skipped on Codex with a recorded reason, never marked failed. The 26 rework cases stay Claude-only, and no threshold or Claude verdict changed.

Monthly

Once a month the census adds Claude Fable and gpt-6-astra

Monthly arms: claude-fable and codex-astra, on the 1st

Real cost: Codex runs are priced from their token usage

Host on record: plans, reports and the ledger name a non-Claude host

CodexPilotClaude-onlyMonthlyTry it

garrytan/gstack · CHANGELOG.md · 1.91.149.0

Once a month, the census adds Claude Fable and Codex on gpt-6-astra. Codex runs now report a real dollar cost, and reports name the host whenever it is not Claude.