For 10,000 requests of 2,000 tokens in and 500 out, Kimi K3.1 Pro costs 43% less than Claude Opus 5.5 on Zurelay: $36.00 against $63.00. Both are below their labs' list prices: 60% for Kimi K3.1 Pro and 65% for Claude Opus 5.5.
Side by side
| Kimi K3.1 Pro | Claude Opus 5.5 | |
|---|---|---|
| Lab | Moonshot AI | Anthropic |
| Released | Oct 24, 2026 | Sep 22, 2026 |
| Context window | 1M tokens | 1M tokens |
| Max output | 32K tokens | 128K tokens |
| Reads | Text, Images | Text, Images, PDFs |
| Reasoning levels | low, high, max | low, medium, high, xhigh, max |
| Price per 1M, in / out | $0.80 / $4.00 | $1.40 / $7.00 |
| Lab list price | $2.00 / $10.00 | $4.00 / $20.00 |
| Cached input per 1M | $0.08 | $0.14 |
| 10K typical requests | $36.00 | $63.00 |
Prices in US dollars per 1M tokens on Zurelay, live from the catalog. A typical request is 2,000 tokens in and 500 out. Output limits are each lab's.
What they're for
Kimi K3.1 Pro is Moonshot AI's newest flagship and the first model of its K3.1 series: Kimi K3 trained much further with reinforcement learning, with native vision and a 1M-token context window. The Zurelay Kimi K3.1 Pro API serves the same model through one OpenAI-compatible endpoint at 60% below Moonshot's list price.
Claude Opus 5.5 is Anthropic's current Opus model, built for long-running agentic coding and knowledge work. The Zurelay Claude Opus 5.5 API serves it through an OpenAI-compatible or Anthropic-compatible endpoint at 65% below Anthropic's list price, for teams that want Opus-level results without Opus-level bills.
Try both
Specs don't say which model handles your work better. Send the same requests to both and compare the answers, the tokens and the bill. On Zurelay that's a change of model name.
To price a whole month, use the LLM cost calculator.
from openai import OpenAIclient = OpenAI(base_url="https://api.zurelay.com/v1", api_key="YOUR_ZURELAY_KEY")prompt = [{"role": "user", "content": "Summarize this contract: ..."}]# Same key, same code: only the model name changesfor model in ["kimi-k3.1-pro", "claude-opus-5-5"]: reply = client.chat.completions.create(model=model, messages=prompt) print(model, reply.usage.total_tokens, reply.choices[0].message.content[:200])FAQ
Anything else? Ask our team and we’ll answer by email.
For 10,000 requests of 2,000 tokens in and 500 out, Kimi K3.1 Pro costs 43% less than Claude Opus 5.5 on Zurelay: $36.00 against $63.00. Per 1M tokens, Kimi K3.1 Pro is $0.80 input and $4.00 output, and Claude Opus 5.5 is $1.40 and $7.00.
Kimi K3.1 Pro, at 1M tokens, against 1M for Claude Opus 5.5.
Yes. One Zurelay key calls both. With an OpenAI SDK, point it at https://api.zurelay.com/v1 and change only the model name, kimi-k3.1-pro or claude-opus-5-5, to switch.
Yes. Each model is served over several routes run by independent sellers, and every route is tested before it serves requests and every day after, with identity, dated-knowledge and reasoning checks that catch an older or different model sold under the name you asked for.
Create a key in seconds, point the SDK you already use at Zurelay, and every request costs up to 90% less from the first token.