Claude-Opus-5 vs Kimi-K3: API Pricing Compared
Side-by-side API pricing and capabilities for Claude-Opus-5 and Kimi-K3. Both are available through Riven behind one OpenAI-compatible endpoint — at vendor list price with transparent per-token pricing, or a flat $3 per million tokens on pay-as-you-go.
| Claude-Opus-5 | Kimi-K3 | |
|---|---|---|
| Input price ($/1M tokens) | $5.00 | $3.00 |
| Output price ($/1M tokens) | $25.00 | $15.00 |
| Vendor | anthropic | provider |
| Capabilities | chat, reasoning, vision, coding | chat |
Model pages: Claude-Opus-5 · Kimi-K3
FAQ
Which is cheaper, Claude-Opus-5 or Kimi-K3?
On Riven both are billed at vendor list price with transparent per-token pricing: Claude-Opus-5 is $5.00/1M input and $25.00/1M output; Kimi-K3 is $3.00/1M input and $15.00/1M output. On the pay-as-you-go plan, every model is a flat $3 per million tokens.
Can I use Claude-Opus-5 and Kimi-K3 with one API key?
Yes. One Riven key reaches both models through the same OpenAI-compatible endpoint, so you can A/B them by changing only the model id.
Is there a markup on these prices?
No. Riven lists these models at vendor list price with transparent per-token pricing. Pay-as-you-go users instead pay a flat $3 per million tokens across every model.