Compare / head-to-head
Claude Sonnet 4.5vs
Kimi K2.5
Kimi K2.5 leads 6 of 11 shared benchmarks. Kimi K2.5 has the larger context window (256K tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
5 – 6
Kimi K2.5 leads
Cheaper per token
—
list price, input + output
Larger context
Kimi K2.5
256K tokens
Providers
2 providers
Anthropic · Moonshot AI
Claude Sonnet 4.5
Anthropic · released 2025-09-29
textvision
Kimi K2.5
Moonshot AI · released 2026-01-27
textvisionvideo
- Context
- 256K
- Max out
- —
- Input /1M
- —
- Output /1M
- —
- Cached /1M
- —
- Scores
- 26 · 14 core
Quality
Benchmark matrix
11 shared · 25 only Claude Sonnet 4.5 · 15 only Kimi K2.5| Benchmark | Claude Sonnet 4.5 | Kimi K2.5 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 11 | ||||
| SWE-bench Verified | 77.2% ↗ | 76.8% ↗ | +0.4 pt | Claude Sonnet 4.5 |
| AIME 2025 | 84.2% ↗matharena ⚠ | 96.1% ↗ | -11.9 pt | Kimi K2.5 |
| LMArena Elo | 1456.6 ↗ | 1450.1 ↗ | +6.5 | Claude Sonnet 4.5 |
| LMArena WebDev (LMArena) | 1393 ↗ | 1435.8 ↗ | -42.8 | Kimi K2.5 |
| OSWorld-Verified (XLANG) | 62.9% ↗ | 63.3% ↗ | -0.4 pt | Kimi K2.5 |
| SAGE (Vals AI) | 36.1% ↗ | 49.9% ↗ | -13.8 pt | Kimi K2.5 |
| SimpleBench (SimpleBench) | 54.3% ↗ | 46.8% ↗ | +7.5 pt | Claude Sonnet 4.5 |
| SimpleQA Verified | 30.7% ↗epoch run | 34.3% ↗epoch run | -3.6 pt | Kimi K2.5 |
| SWE-bench Verified (Epoch AI run) | 71.3% ↗epoch run | 73.8% ↗epoch run | -2.5 pt | Kimi K2.5 |
| Vending-Bench 2 (Andon Labs) | 3838.74 ↗ | 1198.46 ↗ | +2640.3 | Claude Sonnet 4.5 |
| WeirdML (Håvard Tveit Ihle) | 47.7% ↗ | 45.6% ↗ | +2.1 pt | Claude Sonnet 4.5 |
| Only Claude Sonnet 4.5 reports · 25 | ||||
| GPQA Diamond | 83.4% ↗ | not reported | — | — |
| Humanity's Last Exam (no tools) | 17.7% ↗ | not reported | — | — |
| ARC-AGI-2 (Verified) | 13.6% ↗ | not reported | — | — |
| Chess Puzzles (Epoch AI run) | 12% ↗epoch run | not reported | — | — |
| EBR-bench (Epoch AI run) | 2.4% ↗epoch run | not reported | — | — |
| FrontierMath Tier 4 v2 (Epoch AI run) | 2.4% ↗epoch run | not reported | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 23.9% ↗epoch run | not reported | — | — |
| GDPval-AA | 1276 ↗ | not reported | — | — |
| GSO Opt@1 (GSO) | 12.7% ↗ | not reported | — | — |
| Humanity's Last Exam (with tools) | 33.6% ↗ | not reported | — | — |
| MATH Level 5 (Epoch AI run) | 97.7% ↗epoch run | not reported | — | — |
| MCP Atlas | 43.8% ↗ | not reported | — | — |
| MMMLU | 89.5% ↗ | not reported | — | — |
| MMMU-Pro (no tools) | 63.4% ↗ | not reported | — | — |
| MMMU-Pro (with tools) | 68.9% ↗ | not reported | — | — |
| Mystery Game Puzzles (Epoch AI run) | 17% ↗epoch run | not reported | — | — |
| OSWorld-Verified | 61.4% ↗ | not reported | — | — |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 77.8% ↗epoch run | not reported | — | — |
| tau2-bench Airline (Sierra) | 72% ↗ | not reported | — | — |
| tau2-bench Banking Knowledge (Sierra) | 25.3% ↗ | not reported | — | — |
| Tau2-bench Retail | 86.2% ↗ | not reported | — | — |
| tau2-bench Retail (Sierra) | 72.4% ↗ | not reported | — | — |
| Tau2-bench Telecom | 98% ↗ | not reported | — | — |
| tau2-bench Telecom (Sierra) | 84.9% ↗ | not reported | — | — |
| Terminal-Bench 2.0 | 51% ↗ | not reported | — | — |
| Only Kimi K2.5 reports · 15 | ||||
| MMLU-Pro | not reported | 87.1% ↗ | — | — |
| BrowseComp | not reported | 60.6% ↗ | — | — |
| GPQA-Diamond | not reported | 87.6% ↗ | — | — |
| HLE-Full | not reported | 30.1% ↗ | — | — |
| HLE-Full (w/ tools) | not reported | 50.2% ↗ | — | — |
| HMMT 2025 (Feb) | not reported | 95.4% ↗ | — | — |
| IMO-AnswerBench | not reported | 81.8% ↗ | — | — |
| LiveCodeBench (v6) | not reported | 85% ↗ | — | — |
| LMArena Vision (LMArena) | not reported | 1252.2 ↗ | — | — |
| MMMU-Pro | not reported | 78.5% ↗ | — | — |
| SWE-Bench Multilingual | not reported | 73% ↗ | — | — |
| SWE-Bench Pro | not reported | 50.7% ↗ | — | — |
| Terminal Bench 2.0 | not reported | 50.8% ↗ | — | — |
| Toolathlon-Verified (HKUST) | not reported | 33% ↗ | — | — |
| VideoMMMU | not reported | 86.6% ↗ | — | — |
Scores tagged "epoch" or "matharena" are independent runs, used only where the lab has not published its own; ⚠ marks rows MathArena flags as released after the competition. Higher is better on every row. Δ is Claude Sonnet 4.5 minus Kimi K2.5 in the benchmark's own unit. "Not reported" means the lab has not published that figure; it is not a zero. ↗ opens the source.
Specs & pricing
Side by side
Official pricing pages and model cards| Spec | Claude Sonnet 4.5 | Kimi K2.5 | Edge |
|---|---|---|---|
| Context window | 200K tokens | 256K tokens | Kimi K2.5 |
| Max output | 64K tokens | — | — |
| Input price / 1M | $3 ↗ | — | — |
| Output price / 1M | $15 ↗ | — | — |
| Cached input / 1M | $0.3 ↗ | — | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $18 | — | — |
| Modalities | text · vision | text · vision · video | Kimi K2.5 |
| Released | 2025-09-29 | 2026-01-27 | — |
| Cited benchmark scores | 43 | 26 | — |
Reliability
Provider status
Live from /statusMore matchups
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Which one wins on your data?
Public benchmarks are a starting point. Run Claude Sonnet 4.5 and Kimi K2.5 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.