Model comparison
Claude Mythos 5 vs Kimi K3
Head-to-head evidence from 7 shared benchmark results across 3 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Claude Mythos 5 #1 (Supported); Kimi K3 #4 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude Mythos 5 and Kimi K3 share 7 comparable benchmark results. 3 of 8 categories are comparable. 8 results are unique to Claude Mythos 5; 50 to Kimi K3.
Updated July 23, 2026- Shared results
- 7
- Claude Mythos 5 only
- 8
- Kimi K3 only
- 50
- Comparable categories
- 3 / 8
Pick Claude Mythos 5 if you want the stronger benchmark profile. Kimi K3 only becomes the better choice if agentic is the priority or you want the cheaper token bill.
Confidence note. This is a partial-evidence comparison with 7 shared benchmark results across 3 evidence categories; 3 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Claude Mythos 5 has the cleaner BenchAlign overall profile here, landing at 83.93 versus 80.96. It is a real lead, but still close enough that category-level strengths matter more than the headline number.
Claude Mythos 5's sharpest advantage is in multimodal & grounded, where it averages 93.5 against 78.5. The single biggest benchmark swing on the page is HLE, 64.5% to 56%. Kimi K3 does hit back in agentic, so the answer changes if that is the part of the workload you care about most.
Claude Mythos 5 is also the more expensive model on tokens at $10.00 input / $50.00 output per 1M tokens, versus $3.00 input / $15.00 output per 1M tokens for Kimi K3. That is roughly 3.3x on output cost alone. Kimi K3 gives you the larger context window at 1.05M, compared with 1M+ for Claude Mythos 5.
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 | Claude Mythos 5 | Δ | Kimi K3 |
|---|---|---|---|
| Multimodal | Claude Mythos 593.5 | Margin← 15.0 | Kimi K378.5 |
| Knowledge | Claude Mythos 568.5 | Margin← 7.5 | Kimi K361.0 |
| Agentic | Claude Mythos 587.0 | Margin→ 2.5 | Kimi K389.5 |
| Coding | Claude Mythos 589.7 | MarginNo overlap | Kimi K3Not measured |
| Math | Claude Mythos 597.6 | MarginNo overlap | Kimi K3Not measured |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
HLE
KnowledgeA 64.5%B 56%Winner: Claude Mythos 5Δ 8.5HLE: Claude Mythos 5 scored 64.5%; Kimi K3 scored 56%. Claude Mythos 5 wins this benchmark. - Source ↗
BrowseComp
AgenticA 88%B 91.2%Winner: Kimi K3Δ 3.2BrowseComp: Claude Mythos 5 scored 88%; Kimi K3 scored 91.2%. Kimi K3 wins this benchmark. - Source ↗
CharXiv
MultimodalA 93.5%B 91.3%Winner: Claude Mythos 5Δ 2.2CharXiv: Claude Mythos 5 scored 93.5%; Kimi K3 scored 91.3%. Claude Mythos 5 wins this benchmark. - Source ↗
GPQA
KnowledgeA 94.1%B 93.5%Winner: Claude Mythos 5Δ 0.6GPQA: Claude Mythos 5 scored 94.1%; Kimi K3 scored 93.5%. Claude Mythos 5 wins this benchmark. - Source ↗
Terminal-Bench 2.0
AgenticA 88%B 88.3%Winner: Kimi K3Δ 0.3Terminal-Bench 2.0: Claude Mythos 5 scored 88%; Kimi K3 scored 88.3%. Kimi K3 wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude Mythos 5 | Kimi K3 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude Mythos 5$10 input / $50 output | Kimi K3$3 input / $15 output | Kimi K3 has the lower combined listed price. |
| Generation speedtokens per second | Claude Mythos 5Not available | Kimi K3Not available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude Mythos 5Not available | Kimi K3Not available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude Mythos 51M+ | Kimi K31.05M | Kimi K3 lists the larger context window. |
Benchmark Deep Dive
AgenticKimi K3 wins23 benchmarks
| Benchmark | Claude Mythos 5 | Kimi K3 | Result |
|---|---|---|---|
| Terminal-Bench 2.0Source | 88% | 88.3% | Kimi K3 leads |
| OSWorld-VerifiedSource | 85% | — | Not comparable |
| BrowseCompSource | 88% | 91.2% | Kimi K3 leads |
| ExploitGymSource | 17.5% | — | Not comparable |
| DeepSearchQASource | — | 95.0% | Not comparable |
| Toolathlon-VerifiedSource | — | 73.2% | Not comparable |
| MCP AtlasSource | — | 84.2% | Not comparable |
| AutomationBenchSource | — | 30.8% | Not comparable |
| JobBenchSource | — | 52.9% | Not comparable |
| APEX-AgentsSource | — | 37.6% | Not comparable |
| SpreadsheetBench 2Source | — | 34.8% | Not comparable |
| DECK-BenchSource | — | 73.5% | Not comparable |
| AA Agentic IndexSource | — | 50.1% | Not comparable |
| GDPval-AASource | — | 59.0% | Not comparable |
| GDPval-AASource | — | 1679 | Not comparable |
| AA BriefcaseSource | — | 1543 | Not comparable |
| AA AutomationBenchSource | — | 52.7% | Not comparable |
| AA EnterpriseOps-GymSource | — | 45.3% | Not comparable |
| AA Harvey LABSource | — | 94.6% | Not comparable |
| AA Tau3 BankingSource | — | 33.4% | Not comparable |
| aaTerminalBench21Source | — | 85% | Not comparable |
| APEX-Agents-AASource | — | 41.3% | Not comparable |
| AA ITBenchSource | — | 47.7% | Not comparable |
Coding12 benchmarks
| Benchmark | Claude Mythos 5 | Kimi K3 | Result |
|---|---|---|---|
| SWE-bench VerifiedSource | 95.5% | — | Not comparable |
| SWE-bench ProSource | 80.3% | — | Not comparable |
| Terminal-Bench 2.0Source | 88.0% | — | Not comparable |
| deepSweSource | — | 67.5% | Not comparable |
| FrontierSWESource | — | 81.2% | Not comparable |
| ProgramBenchSource | — | 77.8% | Not comparable |
| Kimi Code Bench v2Source | — | 72.9% | Not comparable |
| sweMarathonSource | — | 42% | Not comparable |
| PostTrain BenchSource | — | 36.6% | Not comparable |
| MLS-Bench LiteSource | — | 48.3% | Not comparable |
| AA Coding IndexSource | — | 76.2% | Not comparable |
| AA-SciCodeSource | — | 58.7% | Not comparable |
Reasoning2 benchmarks
KnowledgeClaude Mythos 5 wins10 benchmarks
| Benchmark | Claude Mythos 5 | Kimi K3 | Result |
|---|---|---|---|
| GPQASource | 94.1% | 93.5% | Claude Mythos 5 leads |
| HLESource | 64.5% | 56% | Claude Mythos 5 leads |
| HLE w/o toolsSource | 59% | 43.5% | Claude Mythos 5 leads |
| GPQA-DSource | — | 93.5% | Not comparable |
| Artificial Analysis Intelligence IndexSource | — | 57.1% | Not comparable |
| AA-GPQA DiamondSource | — | 93.5% | Not comparable |
| AA-HLESource | — | 44.3% | Not comparable |
| AA-Omniscience IndexSource | — | 18.4% | Not comparable |
| AA-Omniscience AccuracySource | — | 46.0% | Not comparable |
| AA-Omniscience Hallucination RateSource | — | 50.9% | Not comparable |
Math1 benchmarks
| Benchmark | Claude Mythos 5 | Kimi K3 | Result |
|---|---|---|---|
| USAMO 2026Source | 97.6% | — | Not comparable |
Multilingual1 benchmarks
| Benchmark | Claude Mythos 5 | Kimi K3 | Result |
|---|---|---|---|
| SWE MultilingualSource | 92.2% | — | Not comparable |
MultimodalClaude Mythos 5 wins16 benchmarks
| Benchmark | Claude Mythos 5 | Kimi K3 | Result |
|---|---|---|---|
| SWE-bench MultimodalSource | 54.9% | — | Not comparable |
| CharXivSource | 93.5% | 91.3% | Claude Mythos 5 leads |
| CharXiv w/o toolsSource | 88.9% | 84.8% | Claude Mythos 5 leads |
| OfficeQA ProSource | — | 63.3% | Not comparable |
| MMMU-ProSource | — | 81.6% | Not comparable |
| MMMU-Pro w/ PythonSource | — | 83.4% | Not comparable |
| MathVisionSource | — | 94.3% | Not comparable |
| MathVision w/ PythonSource | — | 97.8% | Not comparable |
| BabyVision w/ PythonSource | — | 85.7% | Not comparable |
| ZeroBenchSource | — | 23.0% | Not comparable |
| ZeroBench w/ PythonSource | — | 41.0% | Not comparable |
| WorldVQA ForceAnswerSource | — | 51.0% | Not comparable |
| OmniDocBenchSource | — | 91.1% | Not comparable |
| PerceptionBenchSource | — | 58.5% | Not comparable |
| AA-MMMU-ProSource | — | 80.5% | Not comparable |
| Design Arena WebsiteSource | — | 1386 | Not comparable |
Frequently Asked Questions (4)
Which is better, Claude Mythos 5 or Kimi K3?
Claude Mythos 5 is ahead on BenchLM's BenchAlign leaderboard, 83.93 to 80.96. The biggest single separator in this matchup is HLE, where the scores are 64.5% and 56%.
Which is better for knowledge tasks, Claude Mythos 5 or Kimi K3?
Claude Mythos 5 has the edge for knowledge tasks in this comparison, averaging 68.5 versus 61. Inside this category, HLE w/o tools is the benchmark that creates the most daylight between them.
Which is better for agentic tasks, Claude Mythos 5 or Kimi K3?
Kimi K3 has the edge for agentic tasks in this comparison, averaging 89.5 versus 87. Inside this category, BrowseComp is the benchmark that creates the most daylight between them.
Which is better for multimodal and grounded tasks, Claude Mythos 5 or Kimi K3?
Claude Mythos 5 has the edge for multimodal and grounded tasks in this comparison, averaging 93.5 versus 78.5. Inside this category, CharXiv w/o tools is the benchmark that creates the most daylight between them.
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