Pairwise benchmark snapshot · Aug 16, 2026
This page compares Claude 3.7 Sonnet (Anthropic) and Claude Opus 4.8 (Anthropic) using the latest snapshots we have as of Aug 16, 2026. On preference Elo, Claude Opus 4.8 is ahead by 236 points (1,598 vs 1,362; seed-bootstrap (Aug 16, 2026)). On SWE-bench coding, Claude Opus 4.8 resolves 78.4% versus 70.3% (seed-bootstrap (Aug 16, 2026)). Claude 3.7 Sonnet streams faster (85 tok/s) while Claude 3.7 Sonnet is the cheaper output token ($15/1M). Claude Opus 4.8 has the larger context window (1M tokens). Every cell below is a dated snapshot from a named public source — we do not invent missing scores, and we do not run SWE-bench ourselves.
Anthropic
Claude 3.7 SonnetHybrid-reasoning Sonnet from 2025. Kept for historical compare pages.
Anthropic
Claude Opus 4.8Prior Opus generation still billed at $5/$25. Kept as a compare baseline against Opus 5.
Instant pairwise benchmark recalculation across 400+ LLMs
Category wins across intelligence, speed, and pricing efficiency.
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
Each spoke is a skill. Farther from the center is better (0–100th percentile). Tap any dot to inspect details.
236 pts advantage
19 tok/s faster
$10.00/1M cheaper
Simulate monthly production API costs based on published $/1M tokens.
Claude 3.7 Sonnet is estimated to save $220.00/month ($2,640/year).
Higher SWE-bench (78.4%).
Lower output list price ($15/1M).
Lower TTFT (240 ms).
Larger window (1M).
Both accept images. Defaulting to the higher-Elo side (Claude Opus 4.8).
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | Claude Opus 4.8 | Higher SWE-bench (78.4%). |
| High-volume chat | Claude 3.7 Sonnet | Lower output list price ($15/1M). |
| Voice / low-latency UI | Claude 3.7 Sonnet | Lower TTFT (240 ms). |
| Long-document RAG | Claude Opus 4.8 | Larger window (1M). |
| Screenshots / vision | Claude Opus 4.8 | Both accept images. Defaulting to the higher-Elo side (Claude Opus 4.8). |
Opus 4.8 still bills $5/$25. We keep it so Opus 5 vs 4.8 is a real generation delta, not marketing.
2025 hybrid-reasoning Sonnet. Deprecated for buying, kept for old compare URLs and “what did 3.7 score?”
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The real PNG is generated at /compare/claude-3-7-sonnet-vs-claude-opus-4-8/opengraph-image for crawlers.
Verified head-to-head card
