Model comparison
GPT-5.4 Pro vs Kimi K2.6
Head-to-head evidence from 6 shared benchmark results across 5 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: GPT-5.4 Pro #44 (Estimated); Kimi K2.6 #74 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5.4 Pro and Kimi K2.6 share 6 comparable benchmark results. 4 of 8 categories are comparable. 6 results are unique to GPT-5.4 Pro; 45 to Kimi K2.6.
Updated July 23, 2026- Shared results
- 6
- GPT-5.4 Pro only
- 6
- Kimi K2.6 only
- 45
- Comparable categories
- 4 / 8
Pick GPT-5.4 Pro if you want the stronger benchmark profile. Kimi K2.6 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 6 shared benchmark results across 5 evidence categories; 4 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
GPT-5.4 Pro is clearly ahead on the BenchAlign aggregate, 60.89 to 56.79. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.4 Pro's sharpest advantage is in knowledge, where it averages 58.7 against 42.2. The single biggest benchmark swing on the page is HLE, 58.7% to 34.7%. Kimi K2.6 does hit back in mathematics, so the answer changes if that is the part of the workload you care about most.
GPT-5.4 Pro is also the more expensive model on tokens at $30.00 input / $180.00 output per 1M tokens, versus $0.95 input / $4.00 output per 1M tokens for Kimi K2.6. That is roughly 45.0x on output cost alone. GPT-5.4 Pro gives you the larger context window at 1.05M, compared with 256K for Kimi K2.6.
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-5.4 Pro | Δ | Kimi K2.6 |
|---|---|---|---|
| Math | GPT-5.4 Pro46.9 | Margin→ 20.2 | Kimi K2.667.1 |
| Knowledge | GPT-5.4 Pro58.7 | Margin← 16.5 | Kimi K2.642.2 |
| Agentic | GPT-5.4 Pro89.3 | Margin← 15.8 | Kimi K2.673.5 |
| Multimodal | GPT-5.4 Pro94.0 | Margin← 14.2 | Kimi K2.679.8 |
| Coding | GPT-5.4 ProNot measured | MarginNo overlap | Kimi K2.664.4 |
| Reasoning | GPT-5.4 Pro83.3 | MarginNo overlap | Kimi K2.6Not measured |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
HLE
KnowledgeA 58.7%B 34.7%Winner: GPT-5.4 ProΔ 24HLE: GPT-5.4 Pro scored 58.7%; Kimi K2.6 scored 34.7%. GPT-5.4 Pro wins this benchmark. - Source ↗
FrontierMath v2 (Tier 4)
MathA 37.500%B 14.580%Winner: GPT-5.4 ProΔ 22.9FrontierMath v2 (Tier 4): GPT-5.4 Pro scored 37.500%; Kimi K2.6 scored 14.580%. GPT-5.4 Pro wins this benchmark. - Source ↗
MMMU-Pro
MultimodalA 94%B 79.4%Winner: GPT-5.4 ProΔ 14.6MMMU-Pro: GPT-5.4 Pro scored 94%; Kimi K2.6 scored 79.4%. GPT-5.4 Pro wins this benchmark. - Source ↗
FrontierMath v2 (Tiers 1-3)
MathA 50.000%B 38.966%Winner: GPT-5.4 ProΔ 11FrontierMath v2 (Tiers 1-3): GPT-5.4 Pro scored 50.000%; Kimi K2.6 scored 38.966%. GPT-5.4 Pro wins this benchmark. - Source ↗
BrowseComp
AgenticA 89.3%B 83.2%Winner: GPT-5.4 ProΔ 6.1BrowseComp: GPT-5.4 Pro scored 89.3%; Kimi K2.6 scored 83.2%. GPT-5.4 Pro wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-5.4 Pro | Kimi K2.6 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5.4 Pro$30 input / $180 output | Kimi K2.6$0.95 input / $4 output | Kimi K2.6 has the lower combined listed price. |
| Generation speedtokens per second | GPT-5.4 Pro74 tok/s | Kimi K2.6Not available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | GPT-5.4 Pro151.79 s | Kimi K2.6Not available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | GPT-5.4 Pro1.05M | Kimi K2.6256K | GPT-5.4 Pro lists the larger context window. |
Benchmark Deep Dive
AgenticGPT-5.4 Pro wins17 benchmarks
| Benchmark | GPT-5.4 Pro | Kimi K2.6 | Result |
|---|---|---|---|
| BrowseCompSource | 89.3% | 83.2% | GPT-5.4 Pro leads |
| Terminal-Bench 2.0Source | — | 66.7% | Not comparable |
| OSWorld-VerifiedSource | — | 73.1% | Not comparable |
| ToolathlonSource | — | 50% | Not comparable |
| MCP AtlasSource | — | 55.9% | Not comparable |
| Claw-EvalSource | — | 62.3% | Not comparable |
| DeepSearchQASource | — | 92.5% | Not comparable |
| WideResearchSource | — | 80.8% | Not comparable |
| AA Agentic IndexSource | — | 30.3% | Not comparable |
| τ²-bench resultsSource | — | 95.9% | Not comparable |
| GDPval-AASource | — | 34.5% | Not comparable |
| GDPval-AASource | — | 1189 | Not comparable |
| APEX-Agents-AASource | — | 28.5% | Not comparable |
| Gert LabsSource | — | 56.82% | Not comparable |
| ResearchClawBenchSource | — | 18.0% | Not comparable |
| OSWorld 2.0Source | — | 4.6% | Not comparable |
| terminalBenchHardSource | — | 43.9% | Not comparable |
Coding10 benchmarks
| Benchmark | GPT-5.4 Pro | Kimi K2.6 | Result |
|---|---|---|---|
| SWE-bench VerifiedSource | — | 80.2% | Not comparable |
| LiveCodeBench v6Source | — | 89.6% | Not comparable |
| SWE-bench ProSource | — | 58.6% | Not comparable |
| SWE MultilingualSource | — | 76.7% | Not comparable |
| SciCodeSource | — | 52.2% | Not comparable |
| Terminal-Bench 2.0Source | — | 66.7% | Not comparable |
| Vibe Code BenchSource | — | 37.89% | Not comparable |
| cursorBench31Source | — | 47.6% | Not comparable |
| AA Coding IndexSource | — | 61.8% | Not comparable |
| AA-SciCodeSource | — | 53.5% | Not comparable |
Reasoning3 benchmarks
KnowledgeGPT-5.4 Pro wins12 benchmarks
| Benchmark | GPT-5.4 Pro | Kimi K2.6 | Result |
|---|---|---|---|
| HLESource | 58.7% | 34.7% | GPT-5.4 Pro leads |
| FrontierScienceSource | 36.7% | — | Not comparable |
| FrontierScience ResearchSource | 36.7% | — | Not comparable |
| HLE w/o toolsSource | 42.7% | — | Not comparable |
| GPQASource | — | 90.5% | Not comparable |
| GPQA-DSource | — | 90.5% | Not comparable |
| Artificial Analysis Intelligence IndexSource | — | 44.2% | Not comparable |
| AA-GPQA DiamondSource | — | 91.1% | Not comparable |
| AA-HLESource | — | 35.9% | Not comparable |
| AA-Omniscience IndexSource | — | 6.4% | Not comparable |
| AA-Omniscience AccuracySource | — | 32.8% | Not comparable |
| AA-Omniscience Hallucination RateSource | — | 39.3% | Not comparable |
MathKimi K2.6 wins7 benchmarks
| Benchmark | GPT-5.4 Pro | Kimi K2.6 | Result |
|---|---|---|---|
| IPhO 2025 (Theory)Source | 93.5% | — | Not comparable |
| FrontierMath (legacy)Source | 50% | — | Not comparable |
| FrontierMath v2 (Tiers 1-3)Source | 50.000% | 38.966% | GPT-5.4 Pro leads |
| FrontierMath v2 (Tier 4)Source | 37.500% | 14.580% | GPT-5.4 Pro leads |
| AIME26Source | — | 96.4% | Not comparable |
| HMMT Feb 2026Source | — | 92.7% | Not comparable |
| MMAnswerBenchSource | — | 86.0% | Not comparable |
MultimodalGPT-5.4 Pro wins7 benchmarks
| Benchmark | GPT-5.4 Pro | Kimi K2.6 | Result |
|---|---|---|---|
| MMMU-ProSource | 94% | 79.4% | GPT-5.4 Pro leads |
| MMMU-Pro w/ PythonSource | — | 80.1% | Not comparable |
| CharXivSource | — | 80.4% | Not comparable |
| MathVisionSource | — | 87.4% | Not comparable |
| V*Source | — | 96.9% | Not comparable |
| AA-MMMU-ProSource | — | 79.4% | Not comparable |
| Design Arena WebsiteSource | — | 1306 | Not comparable |
Inst. Following1 benchmarks
| Benchmark | GPT-5.4 Pro | Kimi K2.6 | Result |
|---|---|---|---|
| AA-IFBenchSource | — | 76.0% | Not comparable |
Frequently Asked Questions (5)
Which is better, GPT-5.4 Pro or Kimi K2.6?
GPT-5.4 Pro is ahead on BenchLM's BenchAlign leaderboard, 60.89 to 56.79. The biggest single separator in this matchup is HLE, where the scores are 58.7% and 34.7%.
Which is better for knowledge tasks, GPT-5.4 Pro or Kimi K2.6?
GPT-5.4 Pro has the edge for knowledge tasks in this comparison, averaging 58.7 versus 42.2. Inside this category, HLE is the benchmark that creates the most daylight between them.
Which is better for math, GPT-5.4 Pro or Kimi K2.6?
Kimi K2.6 has the edge for math in this comparison, averaging 67.1 versus 46.9. Inside this category, FrontierMath v2 (Tier 4) is the benchmark that creates the most daylight between them.
Which is better for agentic tasks, GPT-5.4 Pro or Kimi K2.6?
GPT-5.4 Pro has the edge for agentic tasks in this comparison, averaging 89.3 versus 73.5. Inside this category, BrowseComp is the benchmark that creates the most daylight between them.
Which is better for multimodal and grounded tasks, GPT-5.4 Pro or Kimi K2.6?
GPT-5.4 Pro has the edge for multimodal and grounded tasks in this comparison, averaging 94 versus 79.8. Inside this category, MMMU-Pro is the benchmark that creates the most daylight between them.
Self-host vs API cost
Estimates at 50,000 req/day · 1000 tokens/req average.
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