Model comparison
Claude Sonnet 4.5 vs Gemini 2.5 Pro
Head-to-head evidence from 6 shared benchmark results across 5 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Claude Sonnet 4.5 #96 (Estimated); Gemini 2.5 Pro #70 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude Sonnet 4.5 and Gemini 2.5 Pro share 6 comparable benchmark results. 3 of 8 categories are comparable. 6 results are unique to Claude Sonnet 4.5; 18 to Gemini 2.5 Pro.
Updated July 20, 2026- Shared results
- 6
- Claude Sonnet 4.5 only
- 6
- Gemini 2.5 Pro only
- 18
- Comparable categories
- 3 / 8
Pick Gemini 2.5 Pro if you want the stronger benchmark profile. Claude Sonnet 4.5 only becomes the better choice if knowledge is the priority.
Confidence note. This is a partial-evidence comparison with 6 shared benchmark results across 5 evidence categories; 3 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Gemini 2.5 Pro is clearly ahead on the BenchAlign aggregate, 57.25 to 53.61. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Gemini 2.5 Pro's sharpest advantage is in mathematics, where it averages 11.6 against 11.2. The single biggest benchmark swing on the page is SWE-bench Verified, 77.2% to 63.8%. Claude Sonnet 4.5 does hit back in knowledge, so the answer changes if that is the part of the workload you care about most.
Claude Sonnet 4.5 is also the more expensive model on tokens at $3.00 input / $15.00 output per 1M tokens, versus $1.25 input / $10.00 output per 1M tokens for Gemini 2.5 Pro. Gemini 2.5 Pro gives you the larger context window at 1M, 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 2.5 Pro |
|---|---|---|---|
| Knowledge | Claude Sonnet 4.583.4 | Margin← 56.0 | Gemini 2.5 Pro27.4 |
| Coding | Claude Sonnet 4.577.2 | Margin← 13.4 | Gemini 2.5 Pro63.8 |
| Math | Claude Sonnet 4.511.2 | Margin→ 0.4 | Gemini 2.5 Pro11.6 |
| Agentic | Claude Sonnet 4.555.4 | MarginNo overlap | Gemini 2.5 ProNot measured |
| Reasoning | Claude Sonnet 4.513.6 | MarginNo overlap | Gemini 2.5 ProNot measured |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
SWE-bench Verified
CodingA 77.2%B 63.8%Winner: Claude Sonnet 4.5Δ 13.4SWE-bench Verified: Claude Sonnet 4.5 scored 77.2%; Gemini 2.5 Pro scored 63.8%. Claude Sonnet 4.5 wins this benchmark. - Source ↗
FrontierMath v2 (Tiers 1-3)
MathA 13.495%B 14.138%Winner: Gemini 2.5 ProΔ 0.6FrontierMath v2 (Tiers 1-3): Claude Sonnet 4.5 scored 13.495%; Gemini 2.5 Pro scored 14.138%. Gemini 2.5 Pro wins this benchmark. - Source ↗
GPQA
KnowledgeA 83.4%B 83%Winner: Claude Sonnet 4.5Δ 0.4GPQA: Claude Sonnet 4.5 scored 83.4%; Gemini 2.5 Pro scored 83%. Claude Sonnet 4.5 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 2.5 Pro | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude Sonnet 4.5$3 input / $15 output | Gemini 2.5 Pro$1.25 input / $10 output | Gemini 2.5 Pro has the lower combined listed price. |
| Generation speedtokens per second | Claude Sonnet 4.5Not available | Gemini 2.5 Pro117 tok/s | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude Sonnet 4.5Not available | Gemini 2.5 Pro21.19 s | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude Sonnet 4.5200K | Gemini 2.5 Pro1M | Gemini 2.5 Pro lists the larger context window. |
Benchmark Deep Dive
Agentic9 benchmarks
| Benchmark | Claude Sonnet 4.5 | Gemini 2.5 Pro | Result |
|---|---|---|---|
| Terminal-Bench 2.0Source | 50% | — | Not comparable |
| OSWorld-VerifiedSource | 61.4% | — | Not comparable |
| VITA-BenchSource | 17.0% | — | Not comparable |
| Gert LabsSource | 48.51% | 42.01% | Claude Sonnet 4.5 leads |
| JobBenchSource | 27.7% | — | Not comparable |
| AA Agentic IndexSource | — | 7.1% | Not comparable |
| τ²-bench resultsSource | — | 54.1% | Not comparable |
| GDPval-AASource | — | 8.3% | Not comparable |
| GDPval-AASource | — | 665 | Not comparable |
CodingClaude Sonnet 4.5 wins4 benchmarks
Reasoning3 benchmarks
KnowledgeClaude Sonnet 4.5 wins8 benchmarks
| Benchmark | Claude Sonnet 4.5 | Gemini 2.5 Pro | Result |
|---|---|---|---|
| GPQASource | 83.4% | 83% | Claude Sonnet 4.5 leads |
| HLESource | — | 18.8% | Not comparable |
| Artificial Analysis Intelligence IndexSource | — | 25.8% | Not comparable |
| AA-GPQA DiamondSource | — | 84.4% | Not comparable |
| AA-HLESource | — | 21.1% | Not comparable |
| AA-Omniscience IndexSource | — | -14.3% | Not comparable |
| AA-Omniscience AccuracySource | — | 39.0% | Not comparable |
| AA-Omniscience Hallucination RateSource | — | 87.4% | Not comparable |
MathGemini 2.5 Pro wins3 benchmarks
Multimodal2 benchmarks
Inst. Following1 benchmarks
| Benchmark | Claude Sonnet 4.5 | Gemini 2.5 Pro | Result |
|---|---|---|---|
| AA-IFBenchSource | — | 48.7% | Not comparable |
Frequently Asked Questions (4)
Which is better, Claude Sonnet 4.5 or Gemini 2.5 Pro?
Gemini 2.5 Pro is ahead on BenchLM's BenchAlign leaderboard, 57.25 to 53.61. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 77.2% and 63.8%.
Which is better for knowledge tasks, Claude Sonnet 4.5 or Gemini 2.5 Pro?
Claude Sonnet 4.5 has the edge for knowledge tasks in this comparison, averaging 83.4 versus 27.4. Inside this category, GPQA is the benchmark that creates the most daylight between them.
Which is better for coding, Claude Sonnet 4.5 or Gemini 2.5 Pro?
Claude Sonnet 4.5 has the edge for coding in this comparison, averaging 77.2 versus 63.8. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
Which is better for math, Claude Sonnet 4.5 or Gemini 2.5 Pro?
Gemini 2.5 Pro has the edge for math in this comparison, averaging 11.6 versus 11.2. Inside this category, FrontierMath v2 (Tiers 1-3) is the benchmark that creates the most daylight between them.
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