Model comparison
GPT-5 (medium) vs Kimi K2
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: GPT-5 (medium) #84 (Supported); Kimi K2 #189 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5 (medium) and Kimi K2 share 12 comparable benchmark results. 0 of 8 categories are comparable. 2 results are unique to GPT-5 (medium); 2 to Kimi K2.
Updated July 20, 2026- Shared results
- 12
- GPT-5 (medium) only
- 2
- Kimi K2 only
- 2
- Comparable categories
- 0 / 8
Benchmark data for GPT-5 (medium) and Kimi K2 is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 12 shared benchmark results across 6 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 has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.
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 | GPT-5 (medium) | Δ | Kimi K2 |
|---|---|---|---|
| Math | GPT-5 (medium)Not measured | MarginNo overlap | Kimi K216.1 |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-5 (medium) | Kimi K2 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5 (medium)Not available | Kimi K2$0.6 input / $2.5 output | A complete price comparison is not available. |
| Generation speedtokens per second | GPT-5 (medium)83 tok/s | Kimi K243 tok/s | GPT-5 (medium) has the higher measured throughput. |
| First-answer latencyseconds to first token | GPT-5 (medium)36.28 s | Kimi K21.51 s | Kimi K2 reaches the first token sooner. |
| Context windowmaximum listed tokens | GPT-5 (medium)128K | Kimi K2128K | Listed context windows are equal. |
Benchmark Deep Dive
Agentic1 benchmarks
| Benchmark | GPT-5 (medium) | Kimi K2 | Result |
|---|---|---|---|
| τ²-bench resultsSource | 86.5% | 61.1% | GPT-5 (medium) leads |
Coding1 benchmarks
| Benchmark | GPT-5 (medium) | Kimi K2 | Result |
|---|---|---|---|
| AA-SciCodeSource | 41.1% | 34.5% | GPT-5 (medium) leads |
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | GPT-5 (medium) | Kimi K2 | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 33.7% | 19.4% | GPT-5 (medium) leads |
| AA-GPQA DiamondSource | 84.2% | 76.6% | GPT-5 (medium) leads |
| AA-HLESource | 23.5% | 7.0% | GPT-5 (medium) leads |
| AA-Omniscience IndexSource | -10.1% | -27.5% | GPT-5 (medium) leads |
| AA-Omniscience AccuracySource | 38.9% | 26.8% | GPT-5 (medium) leads |
| AA-Omniscience Hallucination RateSource | 80.1% | 74.2% | Kimi K2 leads |
Math3 benchmarks
Multimodal2 benchmarks
Inst. Following1 benchmarks
| Benchmark | GPT-5 (medium) | Kimi K2 | Result |
|---|---|---|---|
| AA-IFBenchSource | 70.6% | 41.5% | GPT-5 (medium) leads |
Frequently Asked Questions (3)
Can I compare GPT-5 (medium) 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 (medium) and Kimi K2 today?
GPT-5 (medium): Pricing unavailable 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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