Model comparison
Claude Sonnet 4.5 vs Gemini 3 Pro Deep Think
Head-to-head evidence from 1 shared benchmark result across 1 category. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Claude Sonnet 4.5 #96 (Estimated); Gemini 3 Pro Deep Think #41 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude Sonnet 4.5 and Gemini 3 Pro Deep Think share 1 comparable benchmark result. 1 of 8 categories are comparable. 11 results are unique to Claude Sonnet 4.5; 1 to Gemini 3 Pro Deep Think.
Updated July 20, 2026- Shared results
- 1
- Claude Sonnet 4.5 only
- 11
- Gemini 3 Pro Deep Think only
- 1
- Comparable categories
- 1 / 8
Pick Gemini 3 Pro Deep Think if you want the stronger benchmark profile. Claude Sonnet 4.5 only becomes the better choice if you would rather avoid the extra latency and token burn of a reasoning model.
Confidence note. This is a partial-evidence comparison with 1 shared benchmark result across 1 evidence category; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Gemini 3 Pro Deep Think is clearly ahead on the BenchAlign aggregate, 61.31 to 53.61. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Gemini 3 Pro Deep Think's sharpest advantage is in reasoning, where it averages 45.1 against 13.6. The single biggest benchmark swing on the page is ARC-AGI-2, 13.6% to 45.1%.
Gemini 3 Pro Deep Think is the reasoning model in the pair, while Claude Sonnet 4.5 is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. Gemini 3 Pro Deep Think gives you the larger context window at 2M, compared with 200K for Claude Sonnet 4.5.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | Claude Sonnet 4.5 | Δ | Gemini 3 Pro Deep Think |
|---|---|---|---|
| Reasoning | Claude Sonnet 4.513.6 | Margin→ 31.5 | Gemini 3 Pro Deep Think45.1 |
| Agentic | Claude Sonnet 4.555.4 | MarginNo overlap | Gemini 3 Pro Deep ThinkNot measured |
| Coding | Claude Sonnet 4.577.2 | MarginNo overlap | Gemini 3 Pro Deep ThinkNot measured |
| Knowledge | Claude Sonnet 4.583.4 | MarginNo overlap | Gemini 3 Pro Deep ThinkNot measured |
| Math | Claude Sonnet 4.511.2 | MarginNo overlap | Gemini 3 Pro Deep ThinkNot measured |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
ARC-AGI-2
ReasoningA 13.6%B 45.1%Winner: Gemini 3 Pro Deep ThinkΔ 31.5ARC-AGI-2: Claude Sonnet 4.5 scored 13.6%; Gemini 3 Pro Deep Think scored 45.1%. Gemini 3 Pro Deep Think wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude Sonnet 4.5 | Gemini 3 Pro Deep Think | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude Sonnet 4.5$3 input / $15 output | Gemini 3 Pro Deep ThinkNot available | A complete price comparison is not available. |
| Generation speedtokens per second | Claude Sonnet 4.5Not available | Gemini 3 Pro Deep ThinkNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude Sonnet 4.5Not available | Gemini 3 Pro Deep ThinkNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude Sonnet 4.5200K | Gemini 3 Pro Deep Think2M | Gemini 3 Pro Deep Think lists the larger context window. |
Benchmark Deep Dive
Agentic5 benchmarks
Coding1 benchmarks
| Benchmark | Claude Sonnet 4.5 | Gemini 3 Pro Deep Think | Result |
|---|---|---|---|
| SWE-bench VerifiedSource | 77.2% | — | Not comparable |
ReasoningGemini 3 Pro Deep Think wins2 benchmarks
Knowledge1 benchmarks
| Benchmark | Claude Sonnet 4.5 | Gemini 3 Pro Deep Think | Result |
|---|---|---|---|
| GPQASource | 83.4% | — | Not comparable |
Math3 benchmarks
Multimodal1 benchmarks
| Benchmark | Claude Sonnet 4.5 | Gemini 3 Pro Deep Think | Result |
|---|---|---|---|
| Design Arena WebsiteSource | 1222 | — | Not comparable |
Frequently Asked Questions (2)
Which is better, Claude Sonnet 4.5 or Gemini 3 Pro Deep Think?
Gemini 3 Pro Deep Think is ahead on BenchLM's BenchAlign leaderboard, 61.31 to 53.61. The biggest single separator in this matchup is ARC-AGI-2, where the scores are 13.6% and 45.1%.
Which is better for reasoning, Claude Sonnet 4.5 or Gemini 3 Pro Deep Think?
Gemini 3 Pro Deep Think has the edge for reasoning in this comparison, averaging 45.1 versus 13.6. Inside this category, ARC-AGI-2 is the benchmark that creates the most daylight between them.
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