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All model prices

GPT-6 Astra vs Kimi K3.1 Pro API pricing

For a chat message (1K input, 500 output), Kimi K3.1 Pro costs $0.007 per request and GPT-6 Astra costs $0.035, so Kimi K3.1 Pro is about 5× cheaper.

On the overall leaderboard GPT-6 Astra ranks #3 and Kimi K3.1 Pro ranks #2.

Prices are the standard pay-as-you-go prices in OpenRouter's public model list, with input at the cache-miss price. Models OpenRouter does not list use the vendor's official price; those listed in CNY are converted to USD at this round's exchange rate.

Work it out for your own usageSee the model leaderboard

Prices and rankings

USD per million tokensGPT-6 AstraKimi K3.1 Pro
Input$10$2
Output$50$10
Cached input$1$0.2
ProviderOpenAIKimi
Release date2026-09-032026-10-23
Overall rank#3#2
Coding rank#2—
Reasoning rank#2—
Knowledge rank#2—
Professional work rank#9—
Verified2026-10-312026-10-31
Price sourcePrice sourcePrice source

Cost per request by usage

Without cache discounts or batch pricing.

UsageGPT-6 AstraKimi K3.1 ProDifference
Chat message1K in / 500 out$0.035$35 per 1,000$0.007$7 per 1,000Kimi K3.1 Pro is 5× cheaper
Long document100K in / 2K out$1.1$1,100 per 1,000$0.22$220 per 1,000Kimi K3.1 Pro is 5× cheaper
Agent session500K in / 50K out$7.5$7,500 per 1,000$1.5$1,500 per 1,000Kimi K3.1 Pro is 5× cheaper

More price comparisons

GPT-6 Astra vs other models

Kimi K3.1 Pro vs other models