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K = 0.731
All model prices

GPT-6.1 Terra vs GPT-6 Astra API pricing

For a chat message (1K input, 500 output), GPT-6.1 Terra costs $0.0035 per request and GPT-6 Astra costs $0.035, so GPT-6.1 Terra is about 10× cheaper.

On the overall leaderboard GPT-6.1 Terra ranks #10 and GPT-6 Astra 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-6.1 TerraGPT-6 Astra
Input$1$10
Output$5$50
Cached input$0.05$1
ProviderOpenAIOpenAI
Release date2026-10-262026-09-03
Overall rank#10#2
Coding rank—#2
Reasoning rank—#2
Knowledge rank#16#2
Professional work rank—#9
Verified2026-10-282026-10-28
Price sourcePrice sourcePrice source

Cost per request by usage

Without cache discounts or batch pricing.

UsageGPT-6.1 TerraGPT-6 AstraDifference
Chat message1K in / 500 out$0.0035$3.5 per 1,000$0.035$35 per 1,000GPT-6.1 Terra is 10× cheaper
Long document100K in / 2K out$0.11$110 per 1,000$1.1$1,100 per 1,000GPT-6.1 Terra is 10× cheaper
Agent session500K in / 50K out$0.75$750 per 1,000$7.5$7,500 per 1,000GPT-6.1 Terra is 10× cheaper

More price comparisons

GPT-6.1 Terra vs other models

GPT-6 Astra vs other models