Prices → Compare → Claude Sonnet 5 vs Gemini 3.7 Flash
Claude Sonnet 5 vs Gemini 3.7 Flash: API cost compared
Claude Sonnet 5 lists at $2.000 in / $10.00 out per 1M tokens. Gemini 3.7 Flash lists at $0.750 in / $3.750. Sticker price only tells you so much — below is what each actually costs across eight production workloads.
Side by side
| Claude Sonnet 5 | Gemini 3.7 Flash | |
|---|---|---|
| Provider | Anthropic | |
| Input per 1M | $2.000 | $0.750 |
| Output per 1M | $10.00 | $3.750 |
| Cached input per 1M | $0.200 | not published |
| Context window | 200k | 1M |
| Blended per 1M (3:1) | $4.000 | $1.500 |
Monthly cost by workload
Caching applied at each workload's typical hit rate. This is where the two models actually separate.
| Workload | Claude Sonnet 5 | Gemini 3.7 Flash | Cheaper | Difference |
|---|---|---|---|---|
| Customer support chatbot | $257.80 | $133.12 | Gemini 3.7 Flash | $124.68 (48%) |
| RAG document Q&A | $368.00 | $165.00 | Gemini 3.7 Flash | $203.00 (55%) |
| Coding agent | $185.00 | $120.00 | Gemini 3.7 Flash | $65.00 (35%) |
| Bulk summarization | $2,692 | $1,050 | Gemini 3.7 Flash | $1,642 (61%) |
| Structured data extraction | $3,490 | $1,781 | Gemini 3.7 Flash | $1,709 (49%) |
| Long-form content generation | $429.20 | $165.00 | Gemini 3.7 Flash | $264.20 (62%) |
| Email triage agent | $805.00 | $487.50 | Gemini 3.7 Flash | $317.50 (39%) |
| Translation pipeline | $2,810 | $1,069 | Gemini 3.7 Flash | $1,741 (62%) |
How to read this
Gemini 3.7 Flash is cheaper on the majority of these workloads, but "majority" is not the decision. The output:input price ratio is 5.0 for Claude Sonnet 5 and 5.0 for Gemini 3.7 Flash. If your traffic is output-heavy — long-form drafting, translation — the model with the lower output price wins regardless of what the input price suggests. If you are input-heavy — RAG, bulk summarization, agents re-reading a codebase — the cached input rate matters more than either headline number.
Cost is also not the only axis. This site does not benchmark quality, latency, or rate limits, and a model that is 3x cheaper but needs two attempts per task is not cheaper. Use these numbers to size a bill, then validate on your own evals.
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Cost calculator
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| Model | In /1M | Out /1M | Monthly | vs best |
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