Claude Opus 5 vs Kimi K3: AI Model Comparison
Compare Claude Opus 5 and Kimi K3 on 2,668 Arena coding Elo, 93.5% GPQA scientific reasoning, 2.8T MoE architecture, and token pricing.
Claude Opus 5
by Anthropic
Anthropic's flagship Dense (~220B) model leading human preference with a 2,668 Arena Elo, pristine coding accuracy, and 1M context.
View model details
Kimi K3
by Moonshot AI
Moonshot AI's 2.8T MoE reasoning model designed for graduate-level scientific Q&A and long-context needle retrieval.
View model detailsOur Pick: Claude Opus 5
Claude Opus 5 wins for software engineering, full-stack UI development, and human preference; Kimi K3 wins for scientific research reasoning and open weights.
Benchmark Performance
Side-by-side results on major industry benchmarks (higher is better)
Feature Comparison
Compare core capabilities and tool support.
| Feature | Claude Opus 5 | Kimi K3 |
|---|---|---|
| Text & Code Generation | ||
| Image & Vision Understanding | ||
| Video & Audio Generation | ||
| Web Browsing / Search | ||
| Code Execution Environment | ||
| Autonomous Computer Use | ||
| Long Context Window | ||
| Multi-step Agentic Workflows | ||
| Custom Bots / Extensions | ||
| Fine-tuning |
Use Case Ratings
How each model performs in real-world scenarios (1-10).
| Use Case | Claude Opus 5 | Kimi K3 |
|---|---|---|
| Coding & Development | 10 | 9 |
| Writing & Content Creation | 10 | 9 |
| Research & Analysis | 10 | 10 |
| Creative Tasks | 10 | 9 |
| Data Analysis | 9 | 10 |
| Conversation & Nuance | 10 | 9 |
| Education & Tutoring | 10 | 10 |
| Math & Science | 9 | 10 |
| Summarization | 10 | 10 |
Pricing Comparison(Per 1M Tokens)
| Model | Input Tokens | Output Tokens | Blended Cost | Monthly (100M tokens) |
|---|---|---|---|---|
| Claude Opus 5 | $3.00 | $15.00 | ~$6.00 | ~$600 |
| Kimi K3 | $1.50 | $6.00 | ~$2.63 | ~$263 |
Kimi K3 is 56% cheaper
For the same performance tier, Kimi K3 offers exactly half the API cost of Claude Opus 5.
Pros & Cons
Claude Opus 5
- Global #1 in LMSYS Arena human preference (2,668 Elo)
- Higher SWE-Bench software engineering score (48.8% vs 43.1%)
- Higher HumanEval coding accuracy (93.8% vs 90.8%)
- Unrivaled interactive frontend Artifacts and UI component creation
- Higher blended API token cost ($7.22/M vs $4.33/M)
- Lower academic scientific reasoning score (71.4% vs 93.5% GPQA)
Kimi K3
- Record 93.5% score on GPQA Diamond science benchmark
- Massive 2.8T MoE parameter scale for multi-disciplinary synthesis
- 40% lower blended API token price ($4.33/M vs $7.22/M)
- Open weights available for on-premise private deployment
- LMSYS Arena Elo of 1,820 compared to 2,668 for Claude Opus 5
- Lower SWE-Bench verified coding score (43.1% vs 48.8%)
Frequently Asked Questions
Which model produces cleaner React components and CSS?
Claude Opus 5 is substantially superior for frontend UI development, React component architecture, and Tailwind CSS design due to Anthropic's deep training on design systems and Artifacts.
How do their bilingual Chinese-English capabilities compare?
Both models are exceptionally proficient in Chinese and English. Kimi K3 excels in classical Chinese idioms and academic literature, while Claude Opus 5 produces more natural English prose.
Final Takeaway
Choose Claude Opus 5 for software development, full-stack web applications with interactive Artifacts, and technical documentation synthesis. Choose Kimi K3 for academic research papers, biopharmaceutical literature analysis, and open-weights private cloud deployment.
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