Claude Opus 5 vs Gemini 3.8 Flash: API pricing
As of Oct 14, 2026, Claude Opus 5 costs $5.00 input / $25.00 output per million tokens from Anthropic, and Gemini 3.8 Flash costs $0.75 / $3.75 from Google. For 10M input and 2M output tokens a month, Claude Opus 5 comes to $100.00 and Gemini 3.8 Flash to $15.00, so Gemini 3.8 Flash is 85% cheaper than Claude Opus 5. On LMArena, Claude Opus 5 scores higher, 1507 against 1499.
Your monthly cost at the official price
Claude Opus 5: $100.00
Gemini 3.8 Flash: $15.00cheaper
| Detail |  Claude Opus 5 |  Gemini 3.8 Flash |
|---|---|---|
| Maker | Anthropic | |
| Official input / output | $5.00 / $25.00per million tokens | $0.75 / $3.75per million tokens |
| Cached input | $0.50 | $0.075 |
| Cheapest seller | $5.00 / $25.00Amazon Bedrock Converse | $0.75 / $3.75Google Vertex AI |
| Sellers | 7 | 3 |
| Context | 1M | 1.05M |
| LMArena overall | 1507 · #4 | 1499 · #8 |
| LMArena coding | 1533 · #4 | 1507 · #17 |
| Features |
Every seller's price: Claude Opus 5 · Gemini 3.8 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.