Claude Sonnet 5 vs Gemini 3.1 Pro
Anthropic against Google, costed on the same three workloads. Claude Sonnet 5 is cheaper on all three workloads.
Monthly bill, side by side
| Workload | Claude Sonnet 5 | Gemini 3.1 Pro | Difference |
|---|---|---|---|
| Support chatbot 2,500 six-turn conversations a day |
$8,055 | $8,865 | $810 (+10%) |
| Document summariser 1,000 single-shot summaries a day |
$972 | $1,020 | $48.00 (+5%) |
| Coding agent 200 twelve-turn sessions a day |
$5,616 | $5,976 | $360 (+6%) |
No prompt caching and no batch discount on either side, so the comparison is like for like. Both figures assume 30 days a month.
The rate cards
| Claude Sonnet 5 | Gemini 3.1 Pro | |
|---|---|---|
| Input, per 1M tokens | $3 | $2 |
| Output, per 1M tokens | $15 | $12 |
| Cached input | $0.3 | $0.2 |
| Context window | 1M | 1.05M |
| Maximum output | 128K | 66K |
| Reasoning model | yes | yes |
| Vision | yes | yes |
Run this comparison on your own numbers
Full detail: Claude Sonnet 5 pricing · Gemini 3.1 Pro pricing