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K = 0.731
All model prices

GPT-6.1 Terra 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-6.1 Terra costs $0.0035, so Muse Spark 1.3 is about 1× cheaper.

On the overall leaderboard GPT-6.1 Terra ranks #10 and Muse Spark 1.3 ranks #12.

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-6.1 TerraMuse Spark 1.3
Input$1$1.25
Output$5$4.25
Cached input$0.05$0.15
ProviderOpenAIMeta
Release date2026-10-262026-09-02
Overall rank#10#12
Coding rank——
Reasoning rank—#18
Knowledge rank#16—
Professional work rank—#30
Verified2026-10-282026-10-28
Price sourcePrice sourcePrice source

Cost per request by usage

Without cache discounts or batch pricing.

UsageGPT-6.1 TerraMuse Spark 1.3Difference
Chat message1K in / 500 out$0.0035$3.5 per 1,000$0.00337$3.38 per 1,000Muse Spark 1.3 is 1× cheaper
Long document100K in / 2K out$0.11$110 per 1,000$0.13$133.5 per 1,000GPT-6.1 Terra is 1.2× cheaper
Agent session500K in / 50K out$0.75$750 per 1,000$0.84$837.5 per 1,000GPT-6.1 Terra is 1.1× cheaper

More price comparisons

GPT-6.1 Terra vs other models

Muse Spark 1.3 vs other models