Grok 4.5 vs Mistral Medium 3.5
Price in rupees, context and benchmarks side by side; same key, a one-string switch.
Scores from LMArena and Epoch AI, as published; a blank cell means not measured there.
What a month costs on each
On a typical 75/25 input-output mix, Grok 4.5 costs less. Grok 4.5 takes the longer prompt at 500K tokens. Try your own numbers in the cost calculator.
Call either one
curl https://rapidrouter.ai/api/v1/chat/completions \
-H "Authorization: Bearer $RAPIDROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model": "x-ai/grok-4.5", "messages": [{"role": "user", "content": "Hello"}]}'
# the other one: change the model string
-d '{"model": "mistralai/mistral-medium-3-5", ...}'Common questions
Which is cheaper, Grok 4.5 or Mistral Medium 3.5?
Grok 4.5 is cheaper on a typical mix of 75% input and 25% output tokens. Through Rapid Router both are billed at the provider list price per million tokens, in rupees.
Which has the larger context window?
Grok 4.5, at 500K tokens. Mistral Medium 3.5 offers 262K tokens.
Can I switch between Grok 4.5 and Mistral Medium 3.5 without changing code?
Yes. Both are callable at https://rapidrouter.ai/api/v1 with the same OpenAI-compatible request; only the model string changes (x-ai/grok-4.5 or mistralai/mistral-medium-3-5).
How do I pay for Grok 4.5 or Mistral Medium 3.5 in India?
Top up a Rapid Router balance with UPI or a card in rupees, get a GST invoice on every recharge, and both models debit that balance per request.