Pairwise benchmark snapshot · Aug 16, 2026
This page compares Claude Opus 4.8 (Anthropic) and MoonshotAI: Kimi K2 0711 (Moonshot) using the latest snapshots we have as of Aug 16, 2026. On preference Elo, Claude Opus 4.8 is ahead by 133 points (1,598 vs 1,465; seed-bootstrap (Aug 16, 2026)). On SWE-bench coding, Claude Opus 4.8 resolves 78.4% versus 65.8% (seed-bootstrap (Aug 16, 2026)). MoonshotAI: Kimi K2 0711 streams faster (85 tok/s) while MoonshotAI: Kimi K2 0711 is the cheaper output token ($2.3/1M). 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 Opus 4.8Prior Opus generation still billed at $5/$25. Kept as a compare baseline against Opus 5.
Moonshot
MoonshotAI: Kimi K2 0711Auto-discovered from OpenRouter (moonshotai/kimi-k2). Preview until a second source matches.
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.
133 pts advantage
19 tok/s faster
$22.70/1M cheaper
Simulate monthly production API costs based on published $/1M tokens.
MoonshotAI: Kimi K2 0711 is estimated to save $495.55/month ($5,947/year).
Higher SWE-bench (78.4%).
Lower output list price ($2.3/1M).
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 | MoonshotAI: Kimi K2 0711 | Lower output list price ($2.3/1M). |
| Voice / low-latency UI | MoonshotAI: Kimi K2 0711 | 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). |
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The real PNG is generated at /compare/claude-opus-4-8-vs-kimi-k2/opengraph-image for crawlers.
Verified head-to-head card
