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K = 0.731
All model prices

Claude Opus 5.5 vs DeepSeek V4.1 Flash 1017 API pricing

For a chat message (1K input, 500 output), DeepSeek V4.1 Flash 1017 costs $0.00045 per request and Claude Opus 5.5 costs $0.014, so DeepSeek V4.1 Flash 1017 is about 31× cheaper.

On the overall leaderboard Claude Opus 5.5 ranks #1 and DeepSeek V4.1 Flash 1017 ranks #15.

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 5.5DeepSeek V4.1 Flash 1017
Input$4$0.15
Output$20$0.6
Cached input$0.2$0.003
ProviderAnthropicdeepseek
Release date2026-09-17—
Overall rank#1#15
Coding rank#1—
Reasoning rank#3—
Knowledge rank#5—
Professional work rank#3#14
Verified2026-10-202026-10-20
Price sourcePrice sourcePrice source

Cost per request by usage

Without cache discounts or batch pricing.

UsageClaude Opus 5.5DeepSeek V4.1 Flash 1017Difference
Chat message1K in / 500 out$0.014$14 per 1,000$0.00045$0.45 per 1,000DeepSeek V4.1 Flash 1017 is 31× cheaper
Long document100K in / 2K out$0.44$440 per 1,000$0.0162$16.2 per 1,000DeepSeek V4.1 Flash 1017 is 27× cheaper
Agent session500K in / 50K out$3$3,000 per 1,000$0.1$105 per 1,000DeepSeek V4.1 Flash 1017 is 29× cheaper

More price comparisons

Claude Opus 5.5 vs other models

DeepSeek V4.1 Flash 1017 vs other models