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All model prices

Gemini 4 Carbon vs GPT-6 Astra API pricing

For a chat message (1K input, 500 output), Gemini 4 Carbon costs $0.007 per request and GPT-6 Astra costs $0.035, so Gemini 4 Carbon is about 5× cheaper.

On the overall leaderboard Gemini 4 Carbon ranks #2 and GPT-6 Astra 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 tokensGemini 4 CarbonGPT-6 Astra
Input$2$10
Output$10$50
Cached input$0.1$1
ProvidergoogleOpenAI
Release date—2026-09-03
Overall rank#2#6
Coding rank—#2
Reasoning rank—#2
Knowledge rank#2#4
Professional work rank—#9
Verified2026-11-132026-11-13
Price sourcePrice sourcePrice source

Cost per request by usage

Without cache discounts or batch pricing.

UsageGemini 4 CarbonGPT-6 AstraDifference
Chat message1K in / 500 out$0.007$7 per 1,000$0.035$35 per 1,000Gemini 4 Carbon is 5× cheaper
Long document100K in / 2K out$0.22$220 per 1,000$1.1$1,100 per 1,000Gemini 4 Carbon is 5× cheaper
Agent session500K in / 50K out$1.5$1,500 per 1,000$7.5$7,500 per 1,000Gemini 4 Carbon is 5× cheaper

More price comparisons

Gemini 4 Carbon vs other models

GPT-6 Astra vs other models