Claude Opus 4.8 vs Kimi K3
How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for Claude Opus 4.8 and Kimi K3.
Claude Opus 4.8
Claude Opus 4.8 is Anthropic's most capable generally available model in the Opus family. It supports text, image, and file inputs with text output, with reasoning support and a 1M-token...
Kimi K3
Kimi K3 is an ultra-large-scale, open-weight multimodal reasoning model from Moonshot AI. It is suited for complex coding, knowledge work, and long-horizon agentic workflows, and is particularly strong at navigating...
Technical Specifications
| Specification | Claude Opus 4.8 | Kimi K3 |
|---|---|---|
| Provider | Anthropic | Moonshot AI |
| Context Window | 1,000,000 tokens | 1,048,576 tokens |
| Agent Suitability | 97/100 | N/A |
| Time to First Token (TTFT) | 520 ms | N/A |
| Deployment Model | managed api | managed api |
| Production Stability | beta | beta |
| API Available | Yes | Yes |
| Released Date | 2026-05-27 | 2026-07-16 |
API Pricing Comparison
Input Price per Million Tokens
Claude Opus 4.8
$5.00
Kimi K3
$3.00
Output Price per Million Tokens
Claude Opus 4.8
$25.00
Kimi K3
$15.00
Want to test both models live?
Run side-by-side prompt prompts in our dynamic Sandbox. Check execution speeds, latency metrics, and compute actual costs in real-time.
Benchmark Performance Metrics
Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.
Claude Opus 4.8 Quirks & Gotchas
- ▸Best-in-class for autonomous code repair and multi-agent orchestration
- ▸Preview model — API may introduce breaking changes without notice
Kimi K3 Quirks & Gotchas
No developer gotchas reported.