Claude Opus 4.8 vs Kimi K3

Anthropic's Claude Opus 4.8 against Moonshot's Kimi K3 — price, context and what each is best at. Both are available through one OpenAI-compatible API.

AnyModel — you pay	Claude Opus 4.8	Kimi K3
Vendor	Anthropic	Moonshot
Input / 1M	$0.2	$0.15
Output / 1M	$0.2	$0.15
Context	1M	256K
Best for	Architecture	Complex coding

Claude Opus 4.8

The current Opus — Anthropic's agentic-coding flagship.

Claude Opus 4.8 leads the Claude 4 line on nuanced reasoning, agentic coding and careful long-form writing, now with a 1M-token context window. The go-to when output quality matters more than cost.

More about Claude Opus 4.8 →

Kimi K3

Moonshot's multimodal flagship for coding, games and knowledge work.

Kimi K3 is Moonshot's newest flagship model with image understanding, served through the connected Kimi Code subscription. It requires the Moderato tier or higher and has the Kimi Code route's 256K context limit.

More about Kimi K3 →

Quick take: pick Kimi K3 when cost matters most; pick Claude Opus 4.8 when you need the largest context. With AnyModel you don't have to choose up front — switch the model id any time.

FAQ

Which is cheaper, Claude Opus 4.8 or Kimi K3?

Kimi K3 is cheaper on output tokens ($0.15 vs $0.2 per 1M).

Which has a larger context window, Claude Opus 4.8 or Kimi K3?

Claude Opus 4.8 has the larger context window (1M).