Claude Sonnet 5.5 vs Kimi K3 Fast
anthropic/claude-sonnet-5.5 · moonshotai/kimi-k3-fast-api
As of November 5, 2026, Claude Sonnet 5.5 is the cheaper API on UberLLM: $0.0609 per million input tokens and $0.3043 per million output, versus $3.55 / $17.77 for Kimi K3 Fast, about 98% 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 Sonnet 5.5 to cut cost; choose Kimi K3 Fast when its capabilities fit your task better.
Claude Sonnet 5.5 vs Kimi K3 Fast, side by side
| Spec | Claude Sonnet 5.5 | Kimi K3 Fast |
|---|---|---|
| Price · input / 1M | $0.0609 | $3.55 |
| Price · output / 1M | $0.3043 | $17.77 |
| Context length | 1,000,000 | 1,000,000 |
| Max output tokens | 128,000 | 131,072 |
| Input modalities | text, image, file | text, image |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Vision (image input) | Yes | Yes |
| Reasoning | Yes | Yes |
| % off list | 97% off | 21% off |
| First token, median (7 days) | 2.1 s (445 requests) | — |
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 Sonnet 5.5 vs Kimi K3 Fast — FAQ
Is Claude Sonnet 5.5 or Kimi K3 Fast cheaper?
Claude Sonnet 5.5 is cheaper on a blended token mix, by about 98%. 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 Sonnet 5.5 and Kimi K3 Fast?
Claude Sonnet 5.5: $0.0609 in / $0.3043 out per 1M tokens. Kimi K3 Fast: $3.55 in / $17.77 out per 1M tokens. That's roughly a 98% blended difference. Prices are live; UberLLM adds no fee.
Can I use both Claude Sonnet 5.5 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.