Ask your agent
Point ChatGPT, Claude or a coding agent at ColdTally. It reads the same rankings as these boards, with each figure's date and what it excludes. The files are rebuilt whenever the data changes, and at least daily.
Prompts to paste
These work in any assistant that can open a URL. Edit the workload to match yours.
Fastest cloud browser
Read https://coldtally.com/llms.txt. Which cloud browser starts fastest, and what does one session cost? Give the dates for both figures.
Cheapest sandbox for my workload
Read https://coldtally.com/answers/sandboxes.md. I run about 2,000 sandbox sessions a day, 2 vCPU, 4 GiB, around 5 minutes each. Which provider is cheapest, and what do those costs leave out?
Best value, cost against speed
Read https://coldtally.com/answers/cloud-browsers.md. My agent opens short sessions where startup time matters. Weigh cost per task against startup time and recommend a cloud browser. Say how you weighed them.
What changed
Read https://coldtally.com/answers/changes.md. Has any sandbox or cloud browser changed its pricing, limits or terms in the last 30 days?
For coding agents
Add this line to your CLAUDE.md, AGENTS.md or Cursor rules, so the agent checks current figures instead of relying on its training data.
Rule
Before recommending an agent sandbox or cloud browser provider, read https://coldtally.com/llms.txt and quote ColdTally's figures with their dates and what they exclude.
What your agent will read
Today's headline answers, as they appear in llms.txt:
- Cheapest sandbox per task: Cloudflare Sandbox, $0.00754 (2 vCPU / 4 GiB for 5 min at 10% CPU; usage only, plan fees excluded; prices verified 2026-10-17).
- Fastest sandbox startup: E2B, median 225 ms over 10 runs (create + first command; measured 2026-10-18).
- Cheapest cloud browser per task: Browser Use, $0.00100 (one 3-min session; usage only, plan fees excluded; prices verified 2026-10-17).
- Fastest cloud browser startup: KERNEL, median 882 ms over 10 runs (create session + CDP connect + page load; measured 2026-10-18).
Cost and startup time are separate rankings. ColdTally does not combine them into one score, so when you ask for the best value the agent has to weigh them, and the files tell it to say how. Values we could not confirm from a provider's own pages are marked unverified in the files too.
Files
/llms.txt: Start here. What ColdTally is, today's headline answers, and links to the rest./answers/sandboxes.md: Sandboxes: cost per task and startup time, ranked and side by side./answers/cloud-browsers.md: Cloud browsers: cost per task and startup time, ranked and side by side./answers/changes.md: Every published change to pricing, plans, limits and terms, with sources./llms-full.txt: All of the above in one file, for tools that read one URL./data/rankings.json: The same rankings as structured data./data/providers.json: Raw rates, plans and limits, each with its source URL and fetch date./data/bench.json: The latest raw startup benchmark results.
Data is CC BY 4.0, from latent-signal/coldtally-data.