Claude Sonnet 5 vs Gemini 3 Pro
Claude Sonnet 5 is lower on a 1M-input + 1M-output mix (about 31% less), but Gemini 3 Pro has the lower input rate — real workloads skew toward input. Both carry a 1.05M context window. Claude Sonnet 5 answers on /v1/chat/completions and /v1/messages (Claude Code); Gemini 3 Pro on /v1/chat/completions.
Claude Sonnet 5 and Gemini 3 Pro compared on current per-token rates, context window, and capabilities — both callable through one OpenAI-compatible endpoint with per-request cost traces.
Claude Sonnet 5 vs Gemini 3 Pro: rates, context window, and capabilities
| Spec | Claude Sonnet 5 | Gemini 3 Pro |
|---|---|---|
| Input / 1M tokens | $0.90 | $0.882 |
| Output / 1M tokens | $4.50 | $7.00 |
| Cached input / 1M tokens | $0.15 | $0.882 |
| Context window | 1.05M | 1.05M |
| Capabilities | Chat, Streaming, Tool calling, Vision | Chat, Streaming, Tool calling, Vision |
| Detail page | Claude Sonnet 5 | Gemini 3 Pro |
What does 1M tokens cost on Claude Sonnet 5 vs Gemini 3 Pro?
For a workload of 1M input plus 1M output tokens at current rates: Claude Sonnet 5 comes to $5.40, Gemini 3 Pro comes to $7.882 — Claude Sonnet 5 is about 31% cheaper on this mix. Real workloads skew heavily toward input tokens, so weigh the input rate by your own ratio; the cached-input row above is the posted catalog rate for that model.
Switch between Claude Sonnet 5 and Gemini 3 Pro 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:
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-sonnet-5", "messages": [{"role": "user", "content": "Hello"}]}'
# Same request, other model — change one string:
# "model": "google/gemini-3-pro-preview-11-2025"FAQ
Is Claude Sonnet 5 cheaper than Gemini 3 Pro?
At current posted rates, Claude Sonnet 5 is the cheaper of the two (input $0.90 vs $0.882, output $4.50 vs $7.00 per 1M tokens). Rates change; the /models page is the live source of truth.
Can I switch between Claude Sonnet 5 and Gemini 3 Pro 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. Rates on this page were read from the live catalog on 2026-08-30 (UTC) and refresh within the hour.