Why
Astra list rates are easy to misread: cache, long-context bands, and Batch/Flex/Fast multipliers change the monthly bill a lot.
What I shipped
A free calculator on ACG Tools:
https://tools.aicostgate.com/astra
- Monthly estimate from input/output millions
- Cached-input share
- Standard / Batch (×0.5) / Flex (×0.5) / Fast (×2)
- Toggle for prompts often >272K (whole-request reprice)
- Short API access checklist (subscription ≠ API billing; free tier not supported)
Unofficial — confirm on OpenAI’s pricing page before you budget.
Related
- Leaderboard: https://tools.aicostgate.com/prices
- Burn estimator: https://tools.aicostgate.com/burn
- Prompt cost paste tool: https://tools.aicostgate.com/prompt-cost
Feedback welcome on missing line items (tool-call fees are omitted on purpose for now).
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