Background
API cost comparison · data through 2026-10-05 (Pacific)

GPT-6 Luna vs Flash-Lite 3.5

A cost comparison of two tracked small tiers. Tier roles do not establish equal capability, quality or speed.

Model / serviceTierInput / 1MOutput / 1MObservation
GPT-6 Luna
OpenAI
Small$0.1$0.52026-10-05
Verified
Flash-Lite 3.5
Google Gemini
Small$0.3$2.502026-10-05
Verified

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These are recorded base standard list rates in USD per million tokens. Promotions, long-context surcharges, Batch, cache write/storage and other service charges can change the bill. Use the calculator for its supported workload rules and check the linked provider terms. A carried observation is the last known rate, not a fresh verification.

GPT-6 Luna: context capacity 1.05M. Official OpenAI pricing source.

Flash-Lite 3.5: context capacity 1M. Official Google Gemini pricing source.

What would 100,000 English words cost?

Using TokenScale’s estimate of 4 tokens per 3 English words, 100,000 words is about 133,333 tokens. Each column below bills only that direction at the recorded base rate; it is not a complete conversation bill. Language, tokenization, context limits and provider terms can change the result. These are calculations, not provider quotes.

ModelInput onlyOutput only
GPT-6 Luna$0.0133$0.0667
Flash-Lite 3.5$0.04$0.3333

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All model comparisons · All tracked models · Verification method