AI Cost Calculator / Comparison
Which is cheaper for your workload: Claude Opus 5 or Gemini 3.1 Pro? Both are scored against the same three canonical workloads below using per-1M-token list pricing as of 2026-08-15. Gemini 3.1 Pro is cheaper in 3 of 3 workloads — but your own token mix decides, so open the calculator with your numbers.
| Workload | Claude Opus 5 | Gemini 3.1 Pro | Cheaper | Try it |
|---|---|---|---|---|
Chat assistant 1.2K input / 400 output tokens per call, light prompt caching, 500 calls/day. | $246.00/mo | $110.40/mo | Gemini 3.1 Pro | Open in calculator |
Long-context RAG 100K input / 500 output tokens per call, heavy cache reads, 200 calls/day. | $3255.00/mo | $1308.00/mo | Gemini 3.1 Pro | Open in calculator |
Bulk classification 3K input / 20 output tokens per call, no caching, 100K calls/day. | $46500.00/mo | $18720.00/mo | Gemini 3.1 Pro | Open in calculator |
| Model | Input /1M | Output /1M | Cache read /1M | Cache write /1M | Context | Source |
|---|---|---|---|---|---|---|
| Claude Opus 5 frontier | $5.00 | $25.00 | $0.500 | $6.25 | 1,000,000 | Anthropic |
| Gemini 3.1 Pro frontier | $2.00 | $12.00 | $0.200 | — | 1,048,576 |
Cache rates of — mean the provider has not published that tier. Batch API discounts (typically 50%) and negotiated rates are not included — toggle Batch mode in the calculator for those.
Token mix, caching, and volume flip the ranking constantly. Enter your real numbers and compare Claude Opus 5 vs Gemini 3.1 Pro side by side — free, no account, runs in your browser.
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