Claude Sonnet 4.5 vs Gemini 3.5 Flash
Anthropic vs Google — benchmarks, pricing, and capabilities side by side.
- •Gemini 3.5 Flash has the higher intelligence index (92.2 vs 80.4)
- •Gemini 3.5 Flash is cheaper ($1.50 vs $3.00 per 1M input)
- •Gemini 3.5 Flash is faster
- •Gemini 3.5 Flash has a larger context window (1M)
| Claude Sonnet 4.5 | Gemini 3.5 Flash | |
|---|---|---|
| Intelligence index | 80.4 | 92.2 |
| Developer | Anthropic | |
| Type | LLM | Multimodal |
| Access | API only | API only |
| Context window | 1,000,000 tokens | 1,048,576 tokens |
| Input price | $3.00 / 1M | $1.50 / 1M |
| Output price | $15.00 / 1M | $9.00 / 1M |
| Speed | 42 tok/s | 221 tok/s |
| Released | September 29, 2025 | May 19, 2026 |
| Parameters | — | — |
| Input modalities | Text, Image | Text, Image, Audio, Video |
| Output modalities | Text | Text |
Shared benchmarks
Claude Sonnet 4.5
Gemini 3.5 Flash
GPQA Diamond
83.4
92.2
Humanity’s Last Exam
17.3
41