Kimi K3.1 Pro vs Runway Gen-4.5

Practical read: Kimi K3.1 Pro reads more context. One API key runs both.

No card required. Start with 1 million free tokens.

Side by side:

MoonshotAI: Kimi K3.1 Pro compared with Runway Gen-4.5
Attribute	Kimi K3.1 Pro `moonshotai/kimi-k3.1-pro`	Runway Gen-4.5 `runway/gen-4.5`
Best for	Long documents
Cached input	$0.1477/1M to $0.422/1M	Not published
Context window	1.05M 1,048,576 tokens	1K 1,000 tokens
First token, p50	0.94 s via Telnyx	Measuring
AI IQ	IQ 132 #14 on AI IQ	Unrated
Provider routes	15 with failover	2 with failover
Privacy	Confidential E2EE and zero retention route	Varies by provider
Recent route uptime range	100.00%	not enough data
Publisher	Kimi	Runway
Modes	chat
More detail	Overview Pricing Providers	Overview Pricing Providers

Price adds one million input and one million output tokens on the cheapest route. Prices and speed change: see the monthly reports and run a small eval before you choose a default.

Try Kimi K3.1 Pro with your agent

Paste this into Claude Code, Cursor or any coding agent.

Use Kimi K3.1 Pro through TrustedRouter in this project.

1. Read https://trustedrouter.com/docs/llms.txt
2. Point the OpenAI-compatible client at
   https://api.trustedrouter.com/v1 and read the key from
   TRUSTEDROUTER_API_KEY.
3. Set the model to moonshotai/kimi-k3.1-pro.
4. Run the tests, then show me the diff before committing.

import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.trustedrouter.com/v1",
    api_key=os.environ["TRUSTEDROUTER_API_KEY"],
)
response = client.chat.completions.create(
    model="moonshotai/kimi-k3.1-pro",
    messages=[{"role": "user", "content": "What is the capital of France?"}],
)
print(response.choices[0].message.content)

curl https://api.trustedrouter.com/v1/chat/completions \
  -H "Authorization: Bearer $TRUSTEDROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "moonshotai/kimi-k3.1-pro", "messages": [{"role": "user", "content": "What is the capital of France?"}]}'

Your agent will need an API key.

Questions

Which should I use, MoonshotAI: Kimi K3.1 Pro or Runway Gen-4.5?

MoonshotAI: Kimi K3.1 Pro has more Credits provider routes and the larger context window. A published Credits price comparison is not available for both models. There is not enough recent probe data to compare speed.

Is MoonshotAI: Kimi K3.1 Pro or Runway Gen-4.5 cheaper?

The current cheapest TrustedRouter route is $8.862/1M for MoonshotAI: Kimi K3.1 Pro and selected route for Runway Gen-4.5. The comparison uses current catalog prices and updates as provider pricing changes.

Is MoonshotAI: Kimi K3.1 Pro or Runway Gen-4.5 faster?

Current measured p50 time to first token is 936 ms for MoonshotAI: Kimi K3.1 Pro and not enough data for Runway Gen-4.5. These are routed probe measurements, not vendor-advertised speeds, and update as new samples arrive.

Can I test MoonshotAI: Kimi K3.1 Pro and Runway Gen-4.5 with the same API?

Both use the same TrustedRouter base URL and API key. At least one of them is not a chat model, so the request can differ as well as the model id: the API docs list the route for each kind of model.

More comparisons

All comparisons

Try Kimi K3.1 Pro and Runway Gen-4.5 with one key.

TrustedRouter is useful when you know the model you want, but still need provider rollover, budget limits, usage records, and a prompt path you can verify.

No card required. Start with 1 million free tokens.