Compare / head-to-head
Kimi K2.5vs
Seed1.8
Kimi K2.5 leads 5 of 5 shared benchmarks. Both offer a 256K-token context window.
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
5 – 0
Kimi K2.5 leads
Cheaper per token
—
list price, input + output
Larger context
Tie
both 256K tokens
Providers
2 providers
Moonshot AI · ByteDance Seed
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
5 shared · 21 only Kimi K2.5 · 11 only Seed1.8| Benchmark | Kimi K2.5 | Seed1.8 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 5 | ||||
| SWE-bench Verified | 76.8% ↗ | 72.9% ↗ | +3.9 pt | Kimi K2.5 |
| MMLU-Pro | 87.1% ↗ | 84.9% ↗ | +2.2 pt | Kimi K2.5 |
| GPQA-Diamond | 87.6% ↗ | 83.8% ↗ | +3.8 pt | Kimi K2.5 |
| OSWorld-Verified (XLANG) | 63.3% ↗ | 61.9% ↗ | +1.4 pt | Kimi K2.5 |
| Terminal Bench 2.0 | 50.8% ↗ | 45.2% ↗ | +5.6 pt | Kimi K2.5 |
| Only Kimi K2.5 reports · 21 | ||||
| AIME 2025 | 96.1% ↗ | not reported | — | — |
| LMArena Elo | 1450.1 ↗ | not reported | — | — |
| BrowseComp | 60.6% ↗ | not reported | — | — |
| HLE-Full | 30.1% ↗ | not reported | — | — |
| HLE-Full (w/ tools) | 50.2% ↗ | not reported | — | — |
| HMMT 2025 (Feb) | 95.4% ↗ | not reported | — | — |
| IMO-AnswerBench | 81.8% ↗ | not reported | — | — |
| LiveCodeBench (v6) | 85% ↗ | not reported | — | — |
| LMArena Vision (LMArena) | 1252.2 ↗ | not reported | — | — |
| LMArena WebDev (LMArena) | 1435.8 ↗ | not reported | — | — |
| MMMU-Pro | 78.5% ↗ | not reported | — | — |
| SAGE (Vals AI) | 49.9% ↗ | not reported | — | — |
| SimpleBench (SimpleBench) | 46.8% ↗ | not reported | — | — |
| SimpleQA Verified | 34.3% ↗epoch run | not reported | — | — |
| SWE-Bench Multilingual | 73% ↗ | not reported | — | — |
| SWE-Bench Pro | 50.7% ↗ | not reported | — | — |
| SWE-bench Verified (Epoch AI run) | 73.8% ↗epoch run | not reported | — | — |
| Toolathlon-Verified (HKUST) | 33% ↗ | not reported | — | — |
| Vending-Bench 2 (Andon Labs) | 1198.46 ↗ | not reported | — | — |
| VideoMMMU | 86.6% ↗ | not reported | — | — |
| WeirdML (Håvard Tveit Ihle) | 45.6% ↗ | not reported | — | — |
| Only Seed1.8 reports · 11 | ||||
| AIME-25 | not reported | 94.3% ↗ | — | — |
| ARC-AGI-1 | not reported | 67.9% ↗ | — | — |
| BFCL-v4 | not reported | 57.2% ↗ | — | — |
| BrowseComp-en | not reported | 67.6% ↗ | — | — |
| HLE (text-only, agentic search) | not reported | 40.9% ↗ | — | — |
| LiveCodeBench(v6) | not reported | 79.5% ↗ | — | — |
| MM-BrowseComp | not reported | 46.3% ↗ | — | — |
| Multi-SWE-Bench | not reported | 42% ↗ | — | — |
| MultiChallenge | not reported | 66.7% ↗ | — | — |
| WideSearch | not reported | 63.8% ↗ | — | — |
| τ2-Bench | not reported | 72% ↗ | — | — |
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 Kimi K2.5 minus Seed1.8 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 | Kimi K2.5 | Seed1.8 | Edge |
|---|---|---|---|
| Context window | 256K tokens | 256K tokens | Tie |
| Max output | — | 64K tokens | — |
| Input price / 1M | — | $0.25 ↗ | — |
| Output price / 1M | — | $2 ↗ | — |
| Cached input / 1M | — | $0.05 ↗ | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | — | $2.25 | — |
| Modalities | text · vision · video | text · vision · video | Tie |
| Released | 2026-01-27 | 2025-12-18 | — |
| Cited benchmark scores | 26 | 16 | — |
Reliability
Provider status
Live from /statusMore matchups
Kimi K2.5 vs …
Models sharing the most benchmarksMore matchups
Seed1.8 vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run Kimi K2.5 and Seed1.8 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.