What is the difference between GPT-6 Astra Pro and Kimi K3?

GPT-6 Astra Pro is developed by OpenAI while Kimi K3 is developed by Moonshot AI. GPT-6 Astra Pro has a 1.1M token context window vs Kimi K3's 1.0M. You can compare their actual outputs across 6 challenges on Rival to see how they differ in practice.

Which is better, GPT-6 Astra Pro or Kimi K3?

It depends on your use case. GPT-6 Astra Pro and Kimi K3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 6 challenges so you can judge which fits your needs best.

How much does GPT-6 Astra Pro cost compared to Kimi K3?

GPT-6 Astra Pro costs $10/M input tokens and Kimi K3 costs $3/M input tokens. Kimi K3 is $7.00/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare GPT-6 Astra Pro and Kimi K3 on Rival?

This page shows a side-by-side comparison of GPT-6 Astra Pro and Kimi K3 across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

Updated Sep 2026

GPT-6 Astra ProvsKimi K3

Kimi K3 is cheaper than GPT-6 Astra Pro at $3/M vs $10/M input tokens.

GPT-6 Astra Pro and Kimi K3 compared across 6 shared prompts
Spec	GPT-6 Astra Pro	Kimi K3
Input price	$10/M tokens	$3/M tokens
Output price	$50/M tokens	$15/M tokens
Context window	1.1M tokens	1.0M tokens
Weights	Closed	Open
Free API (OpenRouter)	No	No
Released	Sep 2026	Jul 2026

Our Verdict

GPT-6 Astra Pro

Kimi K3Runner-up

Not enough votes to call it. On the specs, GPT-6 Astra Pro has the edge: newer, major provider backing.

Kimi K3 costs 3.3x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

GPT-6 Astra Pro

Input

$10.00

Output

$50.00

Kimi K3

Input

$3.00

3.3× cheaper

Output

$15.00

3.3× cheaper

Kimi K3 is cheaper on both: 3.3× input, 3.3× output.

Where to run it

19 hosts, cheapest first

GPT-6 Astra Pro2 hosts

HostInOutContextUptime

Azure AI Foundry$10.00 in$50.00 out1.1M98.9% up OpenAI$10.00 in$50.00 out1.1M99.6% up

Kimi K317 hosts

HostInOutContextUptime

InferenceNet$2.10 in$10.95 out1M97.2% up Morphfp8$2.38 in$13.30 out1M99.2% up Relacefp4$2.40 in$12.00 out1M99.2% up Makora$2.55 in$12.75 out1M95.2% up DigitalOcean$2.55 in$12.95 out1M99.5% up Sail Researchfp4$2.65 in$13.28 out1M99.9% up

11 more hosts

Phala$2.70 in$13.50 out1M99.3% up DeepInfrabf16$2.85 in$14.25 out1M97.7% up Wafer$3.00 in$12.75 out1M99.6% up Basetenfp8$3.00 in$15.00 out1M93.5% up Chutesmxfp4$3.00 in$15.00 out1M98.6% up Fireworks$3.00 in$15.00 out1M99.9% up Modalmxfp4$3.00 in$15.00 out1M99.7% up Moonshot AImxfp4$3.00 in$15.00 out1M98.7% up Parasailfp4$3.00 in$15.00 out1M98.9% up Together$3.00 in$15.00 out1M99.5% up Alibaba Cloud$3.45 in$17.25 out1M99.8% up

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Research

What we learned reading every model

FAQ

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More comparisons

Cost per 1M tokens

19 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between GPT-6 Astra Pro and Kimi K3?

Which is better, GPT-6 Astra Pro or Kimi K3?

How much does GPT-6 Astra Pro cost compared to Kimi K3?

How can I compare GPT-6 Astra Pro and Kimi K3 on Rival?

More comparisons

Against the newest arrivals

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Model pages

Cost per 1M tokens

19 hosts, cheapest first

What we learned reading every model

Common questions

What is the difference between GPT-6 Astra Pro and Kimi K3?

Which is better, GPT-6 Astra Pro or Kimi K3?

How much does GPT-6 Astra Pro cost compared to Kimi K3?

How can I compare GPT-6 Astra Pro and Kimi K3 on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages