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K = 0.731
All model prices

Claude Opus 5.5 vs GPT-6.1 Sol API pricing

For a chat message (1K input, 500 output), GPT-6.1 Sol costs $0.007 per request and Claude Opus 5.5 costs $0.014, so GPT-6.1 Sol is about 2× cheaper.

On the overall leaderboard Claude Opus 5.5 ranks #1 and GPT-6.1 Sol ranks #6.

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 Sol
Input$4$2
Output$20$10
Cached input$0.2$0.1
ProviderAnthropicOpenAI
Release date2026-09-17—
Overall rank#1#6
Coding rank#1#8
Reasoning rank#3#1
Knowledge rank#5#3
Professional work rank#3#12
Verified2026-10-192026-10-19
Price sourcePrice sourcePrice source

Cost per request by usage

Without cache discounts or batch pricing.

UsageClaude Opus 5.5GPT-6.1 SolDifference
Chat message1K in / 500 out$0.014$14 per 1,000$0.007$7 per 1,000GPT-6.1 Sol is 2× cheaper
Long document100K in / 2K out$0.44$440 per 1,000$0.22$220 per 1,000GPT-6.1 Sol is 2× cheaper
Agent session500K in / 50K out$3$3,000 per 1,000$1.5$1,500 per 1,000GPT-6.1 Sol is 2× cheaper

More price comparisons

Claude Opus 5.5 vs other models

GPT-6.1 Sol vs other models