Claude Opus 4.8 vs Gemini 3.5 Flash

Anthropic's Claude Opus 4.8 against Google's Gemini 3.5 Flash — price, context and what each is best at. Both are available through one OpenAI-compatible API.

AnyModel — you pay	Claude Opus 4.8	Gemini 3.5 Flash
Vendor	Anthropic	Google
Input / 1M	$0.4	$0.03
Output / 1M	$0.4	$0.03
Context	1M	1M
Best for	Architecture	Agents

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 →

Gemini 3.5 Flash

Google's newest default — frontier smarts at a Flash price.

Gemini 3.5 Flash is Google's freshest GA model: it beats Gemini 3.1 Pro on agentic and coding benchmarks while running about 4× faster, with selectable thinking levels and a 1M-token window — the new default pick of the Gemini line.

More about Gemini 3.5 Flash →

Quick take: Gemini 3.5 Flash is cheaper on output tokens ($0.03 vs $0.4 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 Gemini 3.5 Flash?

Gemini 3.5 Flash is cheaper on output tokens ($0.03 vs $0.4 per 1M).

Which has a larger context window, Claude Opus 4.8 or Gemini 3.5 Flash?

Claude Opus 4.8: 1M; Gemini 3.5 Flash: 1M.