Claude Opus 4.8 vs Claude Opus 5

Anthropic's Claude Opus 4.8 against Anthropic's Claude Opus 5 — price, context and what each is best at. Both are available through one OpenAI-compatible API.

AnyModel — you pay	Claude Opus 4.8	Claude Opus 5
Vendor	Anthropic	Anthropic
Input / 1M	$0.2	$0.3
Output / 1M	$0.2	$0.3
Context	1M	1M
Best for	Architecture	Hardest coding tasks

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 →

Claude Opus 5

The newest experimental Opus, served through Kiro.

Claude Opus 5 is Kiro's newest experimental flagship for sustained coding, multi-file work, multi-agent coordination and precise code review. AnyModel routes it only through Kiro accounts where live inference has been verified.

More about Claude Opus 5 →

Quick take: Claude Opus 4.8 is cheaper on output tokens ($0.2 vs $0.3 per 1M). Compare their strengths and context for your task; you can switch the model id at any time.

FAQ

Which is cheaper, Claude Opus 4.8 or Claude Opus 5?

Claude Opus 4.8 is cheaper on output tokens ($0.2 vs $0.3 per 1M).

Which has a larger context window, Claude Opus 4.8 or Claude Opus 5?

Claude Opus 4.8: 1M; Claude Opus 5: 1M.