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K = 0.731
All model prices

Claude Opus 5.5 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 Claude Opus 5.5 costs $0.014, so GPT-6.1 Terra is about 4× cheaper.

On the overall leaderboard Claude Opus 5.5 ranks #1 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 tokensClaude Opus 5.5GPT-6.1 Terra
Input$4$1
Output$20$5
Cached input$0.2$0.05
ProviderAnthropicOpenAI
Release date2026-09-172026-10-26
Overall rank#1#10
Coding rank#1—
Reasoning rank#3—
Knowledge rank#5#16
Professional work rank#3—
Verified2026-10-282026-10-28
Price sourcePrice sourcePrice source

Cost per request by usage

Without cache discounts or batch pricing.

UsageClaude Opus 5.5GPT-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

Claude Opus 5.5 vs other models

GPT-6.1 Terra vs other models