Verdict
Claude Opus 4.5 leads 12–2 across 15 shared benchmarks.
Claude Opus 4.5 12 · Kimi K2.5 2 · 1 tied · higher isn't always better — check the caveats below.
Reported scores — protocols may differ. How we compare
Reasoning: Claude Opus 4.5 leads 4–1 across 5 shared reasoning benchmarks (largest gap: SimpleBench, 54.4 vs 36.16 — single evaluator).
Agentic: Claude Opus 4.5 leads 2–0 across 2 shared agentic benchmarks (largest gap: APEX-Agents, 20.7 vs 14.4 — protocols undisclosed).
Vendor claims — compare against the measured scores above. A claim is what a developer says about its own model, not an independent measurement.
No vendor claims on file for Claude Opus 4.5.
Agentic / Tool Use
“It seamlessly integrates vision and language understanding with advanced agentic capabilities, instant and thinking modes, as well as conversational and agentic paradigms.”
“K2.5 transitions from single-agent scaling to a self-directed, coordinated swarm-like execution scheme.”
Coding
“K2.5 generates code from visual specifications (UI designs, video workflows) and autonomously orchestrates tools for visual data processing.”
Multimodal
“Kimi K2.5 is an open-source, native multimodal agentic model built through continual pretraining on approximately 15 trillion mixed visual and text tokens atop Kimi-K2-Base.”
Claude Opus 4.5 leads 12–2 across 15 shared benchmarks. Claude Opus 4.5 leads 12 benchmarks and Kimi K2.5 leads 2, with 1 tied. Higher isn't always better — see the integrity caveats on each benchmark.
Claude Opus 4.5 and Kimi K2.5 have 15 benchmarks in common in our data — those are the only rows where a direct, apples-to-apples comparison is drawn.
Claude Opus 4.5 leads reasoning 4–1. Claude Opus 4.5 leads agentic 2–0.