Claude Opus 4.8 vs Kimi K2.6
Side-by-side comparison across metrics, pricing, and overall score — every value traced to a source.
Verdict: Claude Opus 4.8 ranks highest overall (#2) with a score of 56.0.
The best choice still depends on which metrics matter for your workload — per-metric winners are marked below.
What the numbers hide
Computed from the published values below — no estimates, no generated claims.
Fragile verdict
The overall winner flips to Claude Opus 4.8 if SWE-Bench Pro Score is weighted at 35% (it counts for 29% today). If swe-bench pro score drives your decision, the ranking above may not be your ranking.
Fragile verdict
The overall winner flips to Claude Opus 4.8 if Context Window is weighted at 25% (it counts for 18% today). If context window drives your decision, the ranking above may not be your ranking.
Real tradeoff
Claude Opus 4.8 clearly beats Kimi K2.6 on Context Window but clearly loses on Input Price — this pair is a priorities question, not a quality question.
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| Metric | Claude Opus 4.8Anthropic | Kimi K2.6Moonshot AI |
|---|---|---|
| Overall OptiSift Score | 56.0#2 | 32.9#8 |
| Input Price | $5 | $0.95 |
| Output Price | $25 | $4 |
| Cache Read Price | $0.5 | $0.16 |
| Context Window | 1M | 262K |
| Max Output Tokens | 128K | 262K |
| SWE-Bench Pro Score | 69.2% | 27.3% |
| Tool Calling | Yes | Yes |
| Extended Reasoning | Yes | Yes |
About these models
#2Claude Opus 4.8
Anthropic
Claude Opus 4.8 is Anthropic's reasoning-capable model: $5/$25 per 1M input/output tokens, 1M token context window, 69.2% on SWE-Bench Pro.
#8Kimi K2.6
Moonshot AI
Kimi K2.6 is Moonshot AI's reasoning-capable model: $0.95/$4 per 1M input/output tokens, 262K token context window, 27.3% on SWE-Bench Pro.