# Claude Opus 5 replaces Opus 4.8, and Kimi K3 arrives

> Claude Opus 5 takes over from Opus 4.8 at the same price with saved selections upgraded automatically, and open-weight Kimi K3 is now available.

Jul 28, 2026. Topics: Models. https://www.generalinput.com/changelog/2026-07-28-claude-opus-5-and-kimi-k3

Two hosted models landed at the end of July. Compare them on the [models page](/models).

### Claude Opus 5

Opus 5 replaces Opus 4.8 in the hosted catalog at the same rates: $5 input, $25 output, $0.50 cache read, and $6.25 cache write per million tokens. Every stored reference to Opus 4.8, like a member's default model or a workflow's configured model, now resolves to Opus 5, so nothing needs reconfiguring.

- A 1,000,000-token context window.
- Reasoning effort from low to max, defaulting to medium.
- If Anthropic is overloaded, runs fall back to GPT-5.6 Sol, then Gemini 3.5 Flash.
- Opus 4.8 remains available through Token Tunnel for members whose Claude plan still serves it.

### Kimi K3

Kimi K3 is Moonshot's open-weight model, available for chat, building, workflow runs, and as a utility model.

- A 1,048,576-token context window.
- Reasoning effort from low to max, defaulting to high.
- Image input.

Both models bill on actual cache reads and writes, like the rest of the catalog. Read why we think [running open-source models yourself](/blog/chinese-open-source-models-safest-cheapest) is a safe, cheap option.