Kimi K2 0905 is Moonshot's September 5, 2025 update of the Kimi K2 flagship. It keeps the 1 trillion total parameter Mixture-of-Experts architecture with 32 billion active parameters and extends the context window from 128K to 256K tokens for longer-horizon reasoning and code tasks. The update improves performance on software engineering benchmarks and refines front-end development, producing more useful code outputs. It strengthens tool calling for autonomous agents and handles longer documents and conversations without running out of context. Key strengths include agentic coding, multilingual support, and native tool use designed for agent-driven workflows. It supports structured output, making it suited to applications that need formatted, deterministic responses.
Call Kimi K2 0905 on Opper with the OpenAI SDK. Sign up without a credit card. Get started
Kimi K2 0905 runs on 1 route through the Opper gateway. Compare residency, zero data retention and training posture at a glance, with full data-handling detail per route below.
| Provider | Region | Zero data retention | Training | Input | Output | Cache read |
|---|---|---|---|---|---|---|
| US | No | $0.60 | $2.50 | $0.15 |
Kimi K2 0905 runs on a single route through the Opper gateway today, so its availability is that provider's availability.
Name a second model in the same request and the gateway tries it on retriable errors, so a busy hour never has to reach your users. Set up a fallback chain.
Measured over the last 30 days from each provider's official status feed via StatusGator. Refreshed hourly. See uptime for every provider Opper monitors.
Each route hosting Kimi K2 0905 has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.
Zero data retention: nothing is logged, held for abuse monitoring or used for training. No training on customer data. US; SCCs; DPA available.
Independent benchmark scores — composite indices for reasoning, coding, and math, plus individual eval scores where available.
Call Kimi K2 0905 through the Opper gateway with one API key. Opper is drop-in compatible with the OpenAI, Anthropic and Google AI SDKs.
Kimi K2 0905 is a premium model on Opper. Sign up needs no credit card: you get an API key straight away and the free models work in the playground and the API. Add a card to use premium models, pay-as-you-go with no minimum.
Copy this and paste it into a coding agent like Claude Code, Cursor or Codex and it'll wire up Opper for you.
import OpenAI from "openai";const client = new OpenAI({apiKey: process.env.OPPER_API_KEY,baseURL: "https://api.opper.ai/v3/compat",});const completion = await client.chat.completions.create({model: "novita/kimi-k2-0905",messages: [{ role: "user", content: "Hello" }],});console.log(completion.choices[0].message.content);
Side-by-side on privacy, EU hosting, pricing, and benchmarks.
