Claude Sonnet 4.5 vs Gemini 3 Pro
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
Claude Sonnet 4.5
65.5Anthropic · Sep 2025
The model that made 30-hour autonomous coding sessions real — 77.2% SWE-bench Verified and a 1M-token context beta at $3/$15.
Gemini 3 Pro
73.6Google · Nov 2025
Google's November 2025 frontier breakout — 91.9% GPQA Diamond and 37.5% HLE made it the reasoning leader of its generation.
The verdict
Gemini 3 Pro wins 5 of the 6 benchmarks these models share, against 1 for Claude Sonnet 4.5. Gemini 3 Pro is about 1.3x cheaper per blended million tokens (3:1 input:output mix). Gemini 3 Pro also takes 1M of context versus 200K for Claude Sonnet 4.5.
Benchmark head-to-head 1–5
Specs & pricing
| Claude Sonnet 4.5 | Gemini 3 Pro | |
|---|---|---|
| modhub Index | 65.5 | 73.6 |
| Input price / 1M | $3 | $2 |
| Output price / 1M | $15 | $12 |
| Context window | 200K | 1M |
| Max output | 64K | 66K |
| Open weights | no | no |
| Reasoning model | yes | yes |
| Multimodal input | text, image | text, image, audio, video |
| Knowledge cutoff | Jan 2025 | Jan 2025 |
| Released | Sep 2025 | Nov 2025 |
| Example monthly cost* | $52.50 | $38.00 |
* 10M input + 1.5M output tokens per month at list prices, no caching. Green = better value on that row.
Frequently asked questions
- Which is better, Claude Sonnet 4.5 or Gemini 3 Pro?
- Gemini 3 Pro wins 5 of the 6 benchmarks these models share, against 1 for Claude Sonnet 4.5. Gemini 3 Pro is about 1.3x cheaper per blended million tokens (3:1 input:output mix). Gemini 3 Pro also takes 1M of context versus 200K for Claude Sonnet 4.5.
- Which is cheaper, Claude Sonnet 4.5 or Gemini 3 Pro?
- Claude Sonnet 4.5 costs $3/$15 per million input/output tokens, while Gemini 3 Pro costs $2/$12. For a typical workload of 10M input and 1.5M output tokens per month, that's $52.50 versus $38.00.
- Which model is better for coding, Claude Sonnet 4.5 or Gemini 3 Pro?
- On SWE-bench Verified — the standard agentic-coding benchmark — Claude Sonnet 4.5 scores 77.2% versus 76.2% for Gemini 3 Pro, making Claude Sonnet 4.5 the stronger pick for coding agents.
More comparisons
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