Moonshot launches Kimi K3.1 Pro API with Highspeed tier

Kimi K3.1 Pro is now on the Kimi API; weights release promised by Nov 4 2026. Highspeed mode runs 2‑3× faster at double the $2 / M input‑token and $10 / M output‑token price, matching GPT‑6.1 Sol and half Claude Opus 5.5. Moonshot benchmarks place Kimi level with Opus 5.5 and GPT‑6 Astra, scoring 55 versus 58 for Opus.

Benchmarks are the company's own; not independently verified.

Why it matters

Kimi’s Highspeed tier costs $2 / M input and $10 / M output, so product managers should price‑compare against GPT‑6.1 Sol for cost‑sensitive customers.

For product managers

For your product

What does this mean for your product?

Try it on your product

Read at Simon Willison

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