Claude Sonnet 5.5 vs Gemini 2.5 Pro
Both have similar output pricing, while Gemini 2.5 Pro offers a larger context window. Choose Claude Sonnet 5.5 or Gemini 2.5 Pro based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude Sonnet 5.5 | Gemini 2.5 Pro |
|---|---|---|
| Provider | Anthropic | |
| Input / 1M tokens | $2.00 | $1.25 |
| Output / 1M tokens | $10.00 | $10.00 |
| Context window | 1M | 1M |
| Parameters | — | — |
| Open weights | — | No |
| Released | — | Jun 2025 |
| GPQA Diamond score | 95.6 | — |
| LMArena (Chatbot Arena) Elo score | 1471 | 1458 |
| LMArena WebDev Elo score | 1774 | 1226 |
| LMArena Vision Elo score | 1289 | 1263 |
| Epoch Capabilities Index score | 164 | — |
FAQ
Is Claude Sonnet 5.5 or Gemini 2.5 Pro cheaper?
Claude Sonnet 5.5 and Gemini 2.5 Pro have comparable output pricing.
Which has the larger context window, Claude Sonnet 5.5 or Gemini 2.5 Pro?
Gemini 2.5 Pro has the larger context window (1M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.