Claude Opus 5 vs Claude Opus 4.8
Claude Opus 5 and Claude Opus 4.8 compared on current per-token rates, context window, and capabilities — both callable through one OpenAI-compatible endpoint with per-request cost traces.
Claude Opus 5 vs Claude Opus 4.8: rates, context window, and capabilities
| Spec | Claude Opus 5 | Claude Opus 4.8 |
|---|---|---|
| Input / 1M tokens | $2.25 | $2.25 |
| Output / 1M tokens | $11.25 | $11.25 |
| Cached input / 1M tokens | $0.38 | $0.38 |
| Context window | 1.0M | 1.0M |
| Capabilities | — | Chat, Streaming, Tool calling, Vision |
| Detail page | Claude Opus 5 | Claude Opus 4.8 |
Switch between Claude Opus 5 and Claude Opus 4.8 without changing code
Both models are behind the same OpenAI-compatible endpoint, so an A/B test is a one-string change — same key, same code, and every request traced with tokens, cost, and latency in the dashboard:
compare.sh
curl https://api.router.one/v1/chat/completions \
-H "Authorization: Bearer sk-your-router-one-key" \
-H "Content-Type: application/json" \
-d '{"model": "anthropic/claude-opus-5", "messages": [{"role": "user", "content": "Hello"}]}'
# Same request, other model — change one string:
# "model": "anthropic/claude-opus-4.8"FAQ
Can I switch between Claude Opus 5 and Claude Opus 4.8 without changing code?
Yes. Both are served through the same OpenAI-compatible endpoint, so switching is changing the model string in the request — the key, base URL, and request shape stay identical.
Where do these numbers come from?
Specs and prices on this page render from the live Router One catalog — the same data as the /models page — and refresh with it. Pricing methodology is documented on /pricing-methodology.
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