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OpenAI GPT-5.6 Luna: API pricing 2026

Cheapest GPT-5.6 tier. On 30 July 2026 OpenAI cut Luna ~80% to $0.20/$1.20 (from $1/$6 at GA). Suitable for classification, routing, and simple extraction where the flagship's reasoning depth isn't needed. (Rate reflects OpenAI's 30 July 2026 announcement; openai.com/api/pricing is bot-blocked to automated fetch.)

Input $/M tokens
$0.20
Output $/M tokens
$1.20
Cost / task
$0.0018
3k in + 1k out
Tier
small
OpenAI

Cost at common task volumes

1,000 tasks / yr$1.80
10,000 tasks / yr$18.00
100,000 tasks / yr$180
1,000,000 tasks / yr$1,800

Token shape: 3,000 input + 1,000 output per task. No prompt caching. Real cost varies with your actual prompt shape.

Source

↗ https://openai.com/api/pricing

Verified 2026-09-15.

Compare with other LLMs
Claude Opus 5$0.0400Claude Sonnet 5$0.0160Claude Haiku 4.5$0.0080Claude Opus 4.8$0.0400Claude Sonnet 4.6$0.0240OpenAI GPT-5.6 Sol$0.0450OpenAI GPT-5.6 Terra$0.0180Gemini 2.5 Flash$0.0034Gemini 2.5 Flash-Lite$0.0007Grok 4.3$0.0063