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K = 0.731
All model prices

GPT-5.6 Sol vs GPT-6.1 Terra API pricing

For a chat message (1K input, 500 output), GPT-6.1 Terra costs $0.0035 per request and GPT-5.6 Sol costs $0.014, so GPT-6.1 Terra is about 4× cheaper.

On the overall leaderboard GPT-5.6 Sol ranks #14 and GPT-6.1 Terra ranks #10.

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-5.6 SolGPT-6.1 Terra
Input$4$1
Output$20$5
Cached input$0.4$0.05
ProviderOpenAIOpenAI
Release date2026-07-092026-10-26
Overall rank#14#10
Coding rank#9—
Reasoning rank#5—
Knowledge rank#8#16
Professional work rank#26—
Verified2026-10-282026-10-28
Price sourcePrice sourcePrice source

Cost per request by usage

Without cache discounts or batch pricing.

UsageGPT-5.6 SolGPT-6.1 TerraDifference
Chat message1K in / 500 out$0.014$14 per 1,000$0.0035$3.5 per 1,000GPT-6.1 Terra is 4× cheaper
Long document100K in / 2K out$0.44$440 per 1,000$0.11$110 per 1,000GPT-6.1 Terra is 4× cheaper
Agent session500K in / 50K out$3$3,000 per 1,000$0.75$750 per 1,000GPT-6.1 Terra is 4× cheaper

More price comparisons

GPT-5.6 Sol vs other models

GPT-6.1 Terra vs other models