Claude Opus 4.5 vs Kimi K3 Fast
anthropic/claude-opus-4.5 · moonshotai/kimi-k3-fast-api
As of November 5, 2026, Claude Opus 4.5 is the cheaper API on UberLLM: $0.2400 per million input tokens and $1.20 per million output, versus $3.55 / $17.77 for Kimi K3 Fast, about 93% less when output is 3 tokens for every input token. These are the best prices on the market right now. Both work with one OpenAI-compatible key and UberLLM adds no fee. Choose Claude Opus 4.5 to cut cost; choose Kimi K3 Fast when context size wins. Kimi K3 Fast carries the larger context window (1,000,000 vs 198,000 tokens), which can matter for long-document work.
Claude Opus 4.5 vs Kimi K3 Fast, side by side
| Spec | Claude Opus 4.5 | Kimi K3 Fast |
|---|---|---|
| Price · input / 1M | $0.2400 | $3.55 |
| Price · output / 1M | $1.20 | $17.77 |
| Context length | 198,000 | 1,000,000 |
| Max output tokens | 32,768 | 131,072 |
| Input modalities | text, image | text, image |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Vision (image input) | Yes | Yes |
| Reasoning | Yes | Yes |
| % off list | 95.2% off | 21% off |
Best prices on UberLLM right now. No UberLLM fee on requests; adding credit by card costs 5.5% + $0.50. Updated November 5, 2026. A price more than 70% below list is what buyers were billed, not an error. Why so cheap?
Claude Opus 4.5 vs Kimi K3 Fast — FAQ
Is Claude Opus 4.5 or Kimi K3 Fast cheaper?
Claude Opus 4.5 is cheaper on a blended token mix, by about 93%. A request costs what its provider charged, UberLLM adds no fee, and every request is listed with its cost in Activity.
What's the price difference between Claude Opus 4.5 and Kimi K3 Fast?
Claude Opus 4.5: $0.2400 in / $1.20 out per 1M tokens. Kimi K3 Fast: $3.55 in / $17.77 out per 1M tokens. That's roughly a 93% blended difference. Prices are live; UberLLM adds no fee.
Can I use both Claude Opus 4.5 and Kimi K3 Fast with one API?
Yes. Both are served through a single OpenAI-compatible endpoint — set the base URL to https://api.uberllm.dev/v1 and your UberLLM key, then switch between them by changing the model id. Anthropic SDKs work via https://api.uberllm.dev/v1/messages.