Claude Opus 5.5 vs Gemini 3.7 Flash: API pricing
As of Oct 14, 2026, Claude Opus 5.5 costs $4.00 input / $20.00 output per million tokens from Anthropic, and Gemini 3.7 Flash costs $0.75 / $3.75 from Google. For 10M input and 2M output tokens a month, Claude Opus 5.5 comes to $80.00 and Gemini 3.7 Flash to $15.00, so Gemini 3.7 Flash is 81% cheaper than Claude Opus 5.5. On LMArena, Claude Opus 5.5 scores higher, 1516 against 1487.
Your monthly cost at the official price
Claude Opus 5.5: $80.00
Gemini 3.7 Flash: $15.00cheaper
| Detail |  Claude Opus 5.5 |  Gemini 3.7 Flash |
|---|---|---|
| Maker | Anthropic | |
| Official input / output | $4.00 / $20.00per million tokens | $0.75 / $3.75per million tokens |
| Cached input | $0.20 | $0.075 |
| Cheapest seller | $4.00 / $20.00Amazon Bedrock Converse | $0.75 / $3.75Google Vertex AI |
| Sellers | 6 | 5 |
| Context | 1M | 1.05M |
| LMArena overall | 1516 · #2 | 1487 · #14 |
| LMArena coding | 1543 · #2 | 1497 · #29 |
| Features |
Every seller's price: Claude Opus 5.5 · Gemini 3.7 Flash
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Prices in USD from LiteLLM and models.dev, checked daily; arena scores from LMArena (CC BY 4.0). Confirm on the seller's pricing page before you rely on a number.