Pairwise benchmark snapshot · Aug 1, 2026
In this head-to-head showdown, Claude Sonnet 4.5 delivers higher overall intelligence and human-preferred responses (Elo 1,524 vs 1,490), while Claude Opus 4 leads in SWE-bench software engineering benchmarks (72.5%), while Claude Sonnet 4.5 is more budget-friendly at $15/1M per 1M output tokens. Review the complete breakdown below to determine which model best fits your performance and budget requirements.
9 direct benchmark disciplines evaluated across capability, speed, and cost
First Claude 4 Opus generation. Baseline for opus 4 vs opus 5.
Workhorse Anthropic model: most of Opus coding quality at a mid-tier price.
Δ 34 Arena Elo pts
88 tok/s
$15 / 1M output
Relative percentile scores computed across all active models in the benchmark catalog.
Comparing top Western standard models with China's leading frontier rival across 6 skill dimensions. Tap any spoke or dot to inspect.
Category wins across reasoning intelligence, generation speed, and token cost.
Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy
Generation throughput and time to first token responsiveness
Cost per million tokens and max context window length
| Benchmark | Claude Opus 4 | Claude Sonnet 4.5 | Advantage Delta |
|---|---|---|---|
| Preference Elo | +34 | ||
| Coding Elo | +29 | ||
| LiveBench | +0.6% | ||
| SWE-bench | +2.4% | ||
| GPQA Diamond | +0.2% | ||
| Time to first token | +150 ms | ||
| Output speed | 58 tok/s | 88 tok/s | +30 tok/s |
| Input price | +$12/1M | ||
| Output price | +$60/1M | ||
| Context window | — |
Simulate monthly production API costs in USD (US Dollar).
Claude Sonnet 4.5 is estimated to save $1,320.00/month ($15,840/year).
Higher SWE-bench (72.5%).
Lower output list price ($15/1M).
Lower TTFT (240 ms).
Larger window (200k).
Both accept images. Defaulting to the higher-Elo side (Claude Sonnet 4.5).
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | Claude Opus 4 | Higher SWE-bench (72.5%). |
| High-volume chat | Claude Sonnet 4.5 | Lower output list price ($15/1M). |
| Voice / low-latency UI | Claude Sonnet 4.5 | Lower TTFT (240 ms). |
| Long-document RAG | Claude Opus 4 | Larger window (200k). |
| Screenshots / vision | Claude Sonnet 4.5 | Both accept images. Defaulting to the higher-Elo side (Claude Sonnet 4.5). |
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