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K = 0.731
All model prices

GPT-6 Astra vs Muse Spark 1.3 API pricing

For a chat message (1K input, 500 output), Muse Spark 1.3 costs $0.00337 per request and GPT-6 Astra costs $0.035, so Muse Spark 1.3 is about 10× cheaper.

On the overall leaderboard GPT-6 Astra ranks #2 and Muse Spark 1.3 ranks #9.

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-6 AstraMuse Spark 1.3
Input$10$1.25
Output$50$4.25
Cached input$1$0.15
ProviderOpenAIMeta
Release date2026-09-032026-09-02
Overall rank#2#9
Coding rank#2—
Reasoning rank#2#18
Knowledge rank#2—
Professional work rank#8#28
Verified2026-10-192026-10-19
Price sourcePrice sourcePrice source

Cost per request by usage

Without cache discounts or batch pricing.

UsageGPT-6 AstraMuse Spark 1.3Difference
Chat message1K in / 500 out$0.035$35 per 1,000$0.00337$3.38 per 1,000Muse Spark 1.3 is 10× cheaper
Long document100K in / 2K out$1.1$1,100 per 1,000$0.13$133.5 per 1,000Muse Spark 1.3 is 8.2× cheaper
Agent session500K in / 50K out$7.5$7,500 per 1,000$0.84$837.5 per 1,000Muse Spark 1.3 is 9× cheaper

More price comparisons

GPT-6 Astra vs other models

Muse Spark 1.3 vs other models