Claude Opus 5.5 vs Kimi K3
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, Kimi K3 costs less (about 60% less than Claude Opus 5.5). Kimi K3 takes the longer prompt at 1M 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": "anthropic/claude-opus-5-5", "messages": [{"role": "user", "content": "Hello"}]}'
# the other one: change the model string
-d '{"model": "moonshotai/kimi-k3", ...}'Common questions
Which is cheaper, Claude Opus 5.5 or Kimi K3?
Kimi K3 is cheaper on a typical mix of 75% input and 25% output tokens, by about 60%. Through Rapid Router both are billed at the provider list price per million tokens, in rupees.
Which has the larger context window?
Kimi K3, at 1M tokens. Claude Opus 5.5 offers 1M tokens.
Can I switch between Claude Opus 5.5 and Kimi K3 without changing code?
Yes. Both are callable at https://rapidrouter.ai/api/v1 with the same OpenAI-compatible request; only the model string changes (anthropic/claude-opus-5-5 or moonshotai/kimi-k3).
How do I pay for Claude Opus 5.5 or Kimi K3 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.