Model comparison
Kimi K2 vs o1
Head-to-head evidence from 12 shared benchmark results across 6 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Kimi K2 #199 (Supported); o1 #136 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Kimi K2 and o1 share 12 comparable benchmark results. 1 of 8 categories are comparable. 2 results are unique to Kimi K2; 4 to o1.
Updated July 24, 2026- Shared results
- 12
- Kimi K2 only
- 2
- o1 only
- 4
- Comparable categories
- 1 / 8
Pick o1 if you want the stronger benchmark profile. Kimi K2 only becomes the better choice if mathematics is the priority or you want the cheaper token bill.
Confidence note. This is a partial-evidence comparison with 12 shared benchmark results across 6 evidence categories; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
o1 is clearly ahead on the BenchAlign aggregate, 47.14 to 26.36. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
o1 is also the more expensive model on tokens at $15.00 input / $60.00 output per 1M tokens, versus $0.60 input / $2.50 output per 1M tokens for Kimi K2. That is roughly 24.0x on output cost alone. o1 is the reasoning model in the pair, while Kimi K2 is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. o1 gives you the larger context window at 200K, compared with 128K for Kimi K2.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | Kimi K2 | Δ | o1 |
|---|---|---|---|
| Math | Kimi K216.1 | Margin← 6.8 | o19.3 |
| Knowledge | Kimi K2Not measured | MarginNo overlap | o175.7 |
| Inst. Following | Kimi K2Not measured | MarginNo overlap | o192.2 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
FrontierMath v2 (Tiers 1-3)
MathA 21.404%B 9.310%Winner: Kimi K2Δ 12.1FrontierMath v2 (Tiers 1-3): Kimi K2 scored 21.404%; o1 scored 9.310%. Kimi K2 wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Kimi K2 | o1 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Kimi K2$0.6 input / $2.5 output | o1$15 input / $60 output | Kimi K2 has the lower combined listed price. |
| Generation speedtokens per second | Kimi K243 tok/s | o198 tok/s | o1 has the higher measured throughput. |
| First-answer latencyseconds to first token | Kimi K21.51 s | o132.29 s | Kimi K2 reaches the first token sooner. |
| Context windowmaximum listed tokens | Kimi K2128K | o1200K | o1 lists the larger context window. |
Benchmark Deep Dive
Agentic1 benchmarks
| Benchmark | Kimi K2 | o1 | Result |
|---|---|---|---|
| τ²-bench resultsSource | 61.1% | 62.6% | o1 leads |
Coding2 benchmarks
Reasoning2 benchmarks
Knowledge8 benchmarks
| Benchmark | Kimi K2 | o1 | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 19.4% | 23.4% | o1 leads |
| AA-GPQA DiamondSource | 76.6% | 74.7% | Kimi K2 leads |
| AA-HLESource | 7.0% | 7.7% | o1 leads |
| AA-Omniscience IndexSource | -27.5% | -10.5% | o1 leads |
| AA-Omniscience AccuracySource | 26.8% | 34.7% | o1 leads |
| AA-Omniscience Hallucination RateSource | 74.2% | 69.3% | o1 leads |
| MMLUSource | — | 91.8% | Not comparable |
| GPQASource | — | 75.7% | Not comparable |
MathKimi K2 wins2 benchmarks
Multimodal1 benchmarks
| Benchmark | Kimi K2 | o1 | Result |
|---|---|---|---|
| Design Arena WebsiteSource | 1080 | — | Not comparable |
Frequently Asked Questions (2)
Which is better, Kimi K2 or o1?
o1 is ahead on BenchLM's BenchAlign leaderboard, 47.14 to 26.36. The biggest single separator in this matchup is FrontierMath v2 (Tiers 1-3), where the scores are 21.404% and 9.310%.
Which is better for math, Kimi K2 or o1?
Kimi K2 has the edge for math in this comparison, averaging 16.1 versus 9.3. Inside this category, FrontierMath v2 (Tiers 1-3) is the benchmark that creates the most daylight between them.