Claude Sonnet 5.5 vs Kimi K2 Thinking
anthropic/claude-sonnet-5.5 · moonshotai/kimi-k2-thinking
As of October 25, 2026, Kimi K2 Thinking is the cheaper API on UberLLM: $0.0120 per million input tokens and $0.0500 per million output, versus $1.48 / $7.40 for Claude Sonnet 5.5 — about 99% less on a blended 3:1 token mix. Both are reached through one OpenAI-compatible key and routed to the cheapest healthy seller, with no UberLLM fee added, so the price you see is the price you pay. Choose Kimi K2 Thinking to cut cost; choose Claude Sonnet 5.5 when context size wins — Claude Sonnet 5.5 carries the larger context window (1,000,000 vs 262,144 tokens), which can matter for long-document work.
Claude Sonnet 5.5 vs Kimi K2 Thinking, side by side
| Spec | Claude Sonnet 5.5 | Kimi K2 Thinking |
|---|---|---|
| Price · input / 1M | $1.48 | $0.0120 |
| Price · output / 1M | $7.40 | $0.0500 |
| Context length | 1,000,000 | 262,144 |
| Max output tokens | 128,000 | 32,768 |
| Input modalities | text, image, file | text |
| Output modalities | text | text |
| Tools / functions | Yes | Yes |
| Vision (image input) | Yes | — |
| Reasoning | Yes | Yes |
| Cheapest seller | UberLLM | UberLLM |
| % off list | 26% off | 98% off |
Live prices via UberLLM, routed to the cheapest healthy seller. The price shown has no UberLLM fee added. Updated October 25, 2026.
Claude Sonnet 5.5 vs Kimi K2 Thinking — FAQ
Is Claude Sonnet 5.5 or Kimi K2 Thinking cheaper?
Kimi K2 Thinking is cheaper on a blended token mix, by about 99%. UberLLM routes every request to the cheapest healthy seller and bills the price shown, with no fee added.
What's the price difference between Claude Sonnet 5.5 and Kimi K2 Thinking?
Claude Sonnet 5.5: $1.48 in / $7.40 out per 1M tokens. Kimi K2 Thinking: $0.0120 in / $0.0500 out per 1M tokens. That's roughly a 99% blended difference. Prices are live; UberLLM adds no fee.
Can I use both Claude Sonnet 5.5 and Kimi K2 Thinking 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.