Model comparison
Claude 4 Sonnet vs Claude Sonnet 5
Head-to-head evidence from 12 shared benchmark results across 4 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Claude 4 Sonnet #158 (Supported); Claude Sonnet 5 #29 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude 4 Sonnet and Claude Sonnet 5 share 12 comparable benchmark results. 1 of 8 categories are comparable. 4 results are unique to Claude 4 Sonnet; 24 to Claude Sonnet 5.
Updated July 23, 2026- Shared results
- 12
- Claude 4 Sonnet only
- 4
- Claude Sonnet 5 only
- 24
- Comparable categories
- 1 / 8
Pick Claude Sonnet 5 if you want the stronger benchmark profile. Claude 4 Sonnet 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 12 shared benchmark results across 4 evidence categories; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Claude Sonnet 5 is clearly ahead on the BenchAlign aggregate, 65.32 to 42.79. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Sonnet 5's sharpest advantage is in coding, where it averages 76.7 against 72.7. The single biggest benchmark swing on the page is SWE-bench Verified, 72.7% to 85.2%.
Claude 4 Sonnet is also the more expensive model on tokens at $3.00 input / $15.00 output per 1M tokens, versus $2.00 input / $10.00 output per 1M tokens for Claude Sonnet 5. Claude Sonnet 5 is the reasoning model in the pair, while Claude 4 Sonnet 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. Claude Sonnet 5 gives you the larger context window at 1M, compared with 200K for Claude 4 Sonnet.
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 4 Sonnet | Δ | Claude Sonnet 5 |
|---|---|---|---|
| Coding | Claude 4 Sonnet72.7 | Margin→ 4.0 | Claude Sonnet 576.7 |
| Agentic | Claude 4 SonnetNot measured | MarginNo overlap | Claude Sonnet 581.9 |
| Knowledge | Claude 4 SonnetNot measured | MarginNo overlap | Claude Sonnet 557.4 |
| Multimodal | Claude 4 SonnetNot measured | MarginNo overlap | Claude Sonnet 588.3 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
SWE-bench Verified
CodingA 72.7%B 85.2%Winner: Claude Sonnet 5Δ 12.5SWE-bench Verified: Claude 4 Sonnet scored 72.7%; Claude Sonnet 5 scored 85.2%. Claude Sonnet 5 wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude 4 Sonnet | Claude Sonnet 5 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude 4 Sonnet$3 input / $15 output | Claude Sonnet 5$2 input / $10 output | Claude Sonnet 5 has the lower combined listed price. |
| Generation speedtokens per second | Claude 4 Sonnet40 tok/s | Claude Sonnet 5Not available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude 4 Sonnet1.33 s | Claude Sonnet 5Not available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude 4 Sonnet200K | Claude Sonnet 51M | Claude Sonnet 5 lists the larger context window. |
Benchmark Deep Dive
Agentic16 benchmarks
| Benchmark | Claude 4 Sonnet | Claude Sonnet 5 | Result |
|---|---|---|---|
| τ²-bench resultsSource | 52.3% | — | Not comparable |
| Gert LabsSource | 39.66% | — | Not comparable |
| JobBenchSource | 18.4% | — | Not comparable |
| Terminal-Bench 2.0Source | — | 80.4% | Not comparable |
| BrowseCompSource | — | 84.7% | Not comparable |
| HLE w/ toolsSource | — | 57.4% | Not comparable |
| OSWorld-VerifiedSource | — | 81.2% | Not comparable |
| GDPval-AASource | — | 1607 | Not comparable |
| AA Agentic IndexSource | — | 46.7% | Not comparable |
| GDPval-AASource | — | 55.4% | Not comparable |
| AA BriefcaseSource | — | 1388 | Not comparable |
| AA AutomationBenchSource | — | 39.2% | Not comparable |
| AA EnterpriseOps-GymSource | — | 44.7% | Not comparable |
| AA Harvey LABSource | — | 90.1% | Not comparable |
| AA Tau3 BankingSource | — | 28.2% | Not comparable |
| aaTerminalBench21Source | — | 80.5% | Not comparable |
CodingClaude Sonnet 5 wins9 benchmarks
| Benchmark | Claude 4 Sonnet | Claude Sonnet 5 | Result |
|---|---|---|---|
| SWE-bench VerifiedSource | 72.7% | 85.2% | Claude Sonnet 5 leads |
| AA-SciCodeSource | 37.3% | 53.6% | Claude Sonnet 5 leads |
| SWE-bench ProSource | — | 63.2% | Not comparable |
| SWE MultilingualSource | — | 78.3% | Not comparable |
| SWE MultimodalSource | — | 28.1% | Not comparable |
| Terminal-Bench 2.0Source | — | 80.4% | Not comparable |
| FrontierCode 1.1 MainSource | — | 42.7% | Not comparable |
| cursorBench32Source | — | 61.5% | Not comparable |
| AA Coding IndexSource | — | 71.5% | Not comparable |
Reasoning2 benchmarks
Knowledge8 benchmarks
| Benchmark | Claude 4 Sonnet | Claude Sonnet 5 | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 25.5% | 53.4% | Claude Sonnet 5 leads |
| AA-GPQA DiamondSource | 68.3% | 91.1% | Claude Sonnet 5 leads |
| AA-HLESource | 4.0% | 39.6% | Claude Sonnet 5 leads |
| AA-Omniscience IndexSource | -9.2% | 15.3% | Claude Sonnet 5 leads |
| AA-Omniscience AccuracySource | 22.4% | 38.3% | Claude Sonnet 5 leads |
| AA-Omniscience Hallucination RateSource | 40.8% | 37.3% | Claude Sonnet 5 leads |
| HLESource | — | 57.4% | Not comparable |
| HLE w/o toolsSource | — | 43.2% | Not comparable |
Multimodal4 benchmarks
Inst. Following1 benchmarks
| Benchmark | Claude 4 Sonnet | Claude Sonnet 5 | Result |
|---|---|---|---|
| AA-IFBenchSource | 45.4% | — | Not comparable |
Frequently Asked Questions (2)
Which is better, Claude 4 Sonnet or Claude Sonnet 5?
Claude Sonnet 5 is ahead on BenchLM's BenchAlign leaderboard, 65.32 to 42.79. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 72.7% and 85.2%.
Which is better for coding, Claude 4 Sonnet or Claude Sonnet 5?
Claude Sonnet 5 has the edge for coding in this comparison, averaging 76.7 versus 72.7. Inside this category, AA-SciCode is the benchmark that creates the most daylight between them.
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