Grok 4.5 vs GPT-5.5
Grok 4.5 and GPT-5.5 compared on current per-token rates, context window, and capabilities — both callable through one OpenAI-compatible endpoint with per-request cost traces.
Grok 4.5 vs GPT-5.5: rates, context window, and capabilities
What does 1M tokens cost on Grok 4.5 vs GPT-5.5?
For a workload of 1M input plus 1M output tokens at current rates: Grok 4.5 comes to $3.20, GPT-5.5 comes to $2.75 — GPT-5.5 is about 14% cheaper on this mix. Real workloads skew heavily toward input tokens, so weigh the input rate by your own ratio; prompt-cache hits bill at the cached-input rate where supported.
Switch between Grok 4.5 and GPT-5.5 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": "grok-4.5", "messages": [{"role": "user", "content": "Hello"}]}'
# Same request, other model — change one string:
# "model": "openai/gpt-5.5"FAQ
Is Grok 4.5 cheaper than GPT-5.5?
At current posted rates, GPT-5.5 is the cheaper of the two (input $0.80 vs $0.50, output $2.40 vs $2.25 per 1M tokens). Rates change; the /models page is the live source of truth.
Can I switch between Grok 4.5 and GPT-5.5 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.