Model comparison
GPT-5 nano vs Kimi K2
Head-to-head evidence from 0 shared benchmark results across 0 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: GPT-5 nano #139 (Estimated); Kimi K2 #189 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5 nano and Kimi K2 share 0 comparable benchmark results. 0 of 8 categories are comparable. 0 results are unique to GPT-5 nano; 14 to Kimi K2.
Updated July 24, 2026- Shared results
- 0
- GPT-5 nano only
- 0
- Kimi K2 only
- 14
- Comparable categories
- 0 / 8
Benchmark data for GPT-5 nano and Kimi K2 is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 0 shared benchmark results across 0 evidence categories; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
BenchLM does not have sourced benchmark coverage for GPT-5 nano yet. This comparison is currently limited to metadata such as context window, reasoning mode, and pricing where available.
Kimi K2 is priced at $0.60 input / $2.50 output per 1M tokens, versus $0.05 input / $0.40 output per 1M tokens for GPT-5 nano. GPT-5 nano has the larger context window at 400K, compared with 128K for Kimi K2.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-5 nano | Kimi K2 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5 nano$0.05 input / $0.4 output | Kimi K2$0.6 input / $2.5 output | GPT-5 nano has the lower combined listed price. |
| Generation speedtokens per second | GPT-5 nano137 tok/s | Kimi K243 tok/s | GPT-5 nano has the higher measured throughput. |
| First-answer latencyseconds to first token | GPT-5 nano83.30 s | Kimi K21.51 s | Kimi K2 reaches the first token sooner. |
| Context windowmaximum listed tokens | GPT-5 nano400K | Kimi K2128K | GPT-5 nano lists the larger context window. |
Benchmark Deep Dive
Agentic1 benchmarks
| Benchmark | GPT-5 nano | Kimi K2 | Result |
|---|---|---|---|
| τ²-bench resultsSource | — | 61.1% | Not comparable |
Coding1 benchmarks
| Benchmark | GPT-5 nano | Kimi K2 | Result |
|---|---|---|---|
| AA-SciCodeSource | — | 34.5% | Not comparable |
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | GPT-5 nano | Kimi K2 | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | — | 19.4% | Not comparable |
| AA-GPQA DiamondSource | — | 76.6% | Not comparable |
| AA-HLESource | — | 7.0% | Not comparable |
| AA-Omniscience IndexSource | — | -27.5% | Not comparable |
| AA-Omniscience AccuracySource | — | 26.8% | Not comparable |
| AA-Omniscience Hallucination RateSource | — | 74.2% | Not comparable |
Math2 benchmarks
Multimodal1 benchmarks
| Benchmark | GPT-5 nano | Kimi K2 | Result |
|---|---|---|---|
| Design Arena WebsiteSource | — | 1080 | Not comparable |
Inst. Following1 benchmarks
| Benchmark | GPT-5 nano | Kimi K2 | Result |
|---|---|---|---|
| AA-IFBenchSource | — | 41.5% | Not comparable |
Frequently Asked Questions (3)
Can I compare GPT-5 nano and Kimi K2 on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “coming soon”?
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
What data is available for GPT-5 nano and Kimi K2 today?
GPT-5 nano: $0.05 input / $0.40 output per 1M tokens Kimi K2: $0.60 input / $2.50 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
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