Claude Opus 5.5 vs Gemini 4 Argon: 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 4 Argon costs $2.00 / $10.00 from Google. For 10M input and 2M output tokens a month, Claude Opus 5.5 comes to $80.00 and Gemini 4 Argon to $40.00, so Gemini 4 Argon is 50% cheaper than Claude Opus 5.5. On LMArena, Gemini 4 Argon scores higher, 1533 against 1516.
Your monthly cost at the official price
Claude Opus 5.5: $80.00
Gemini 4 Argon: $40.00cheaper
| Detail |  Claude Opus 5.5 |  Gemini 4 Argon |
|---|---|---|
| Maker | Anthropic | |
| Official input / output | $4.00 / $20.00per million tokens | $2.00 / $10.00per million tokens |
| Cached input | $0.20 | $0.10 |
| Cheapest seller | $4.00 / $20.00Amazon Bedrock Converse | $2.00 / $10.00Google Gemini |
| Sellers | 6 | 4 |
| Context | 1M | 1.05M |
| LMArena overall | 1516 · #2 | 1533 · #1 |
| LMArena coding | 1543 · #2 | 1548 · #1 |
| Features |
Every seller's price: Claude Opus 5.5 · Gemini 4 Argon
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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.