How much does GPT-5.6 Luna cost now?

GPT-5.6 Luna now costs $0.20 per million input tokens and $1.20 per million output tokens on the OpenAI API, down from $1 and $6 — an 80% price cut. It is OpenAI's fastest and cheapest model in the GPT-5.6 family and is meant for high-throughput classification, routing, and small edits.

How much does GPT-5.6 Terra cost now?

GPT-5.6 Terra is now $2 per million input tokens and $12 per million output tokens, down from $2.50 and $15 — a 20% cut. Terra is OpenAI's balanced GPT-5.6 tier, priced to sit between the cheap Luna and the flagship Sol tier while keeping GPT-5.5-class quality.

Did GPT-5.6 Sol get cheaper too?

No. OpenAI kept GPT-5.6 Sol pricing unchanged on July 30, 2026. Only Luna and Terra were repriced. Sol Ultra with max reasoning stays at the top of OpenAI's coding-agent leaderboard and still costs less than half of Claude Fable 5 on the Artificial Analysis Coding Agent Index, per OpenAI.

Why is OpenAI cutting GPT-5.6 prices so soon after launch?

OpenAI said serving-cost improvements dropped the end-to-end cost of running the GPT-5.6 family by 20% and lifted token-generation efficiency by more than 15% in the three weeks since launch. The company is passing those gains on to Luna and Terra customers to expand adoption on cheaper tiers.

When does the new GPT-5.6 pricing take effect?

The new GPT-5.6 Luna and Terra prices are live on the OpenAI API pricing page as of July 30, 2026 — the same day OpenAI announced the cut. No opt-in or contract change is required; every API call from that day forward is metered at the lower rate.

OpenAI · 2026-07-30 · major

GPT-5.6 Luna cut 80%, Terra 20% — OpenAI drops API prices three weeks after launch

OpenAI cut GPT-5.6 Luna to $0.20 / $1.20 per million input and output tokens (80% off) and GPT-5.6 Terra to $2 / $12 (20% off) on July 30, 2026. Sol pricing is unchanged. Serving costs fell 20% and token efficiency rose 15%.

OpenAI hero graphic for the GPT-5.6 price-performance frontier announcement

OpenAI drops GPT-5.6 Luna 80% and Terra 20% three weeks after launch, passing on 20% serving-cost gains.

Key specs

Luna reduction	80%
Terra reduction	20%
Serving cost drop	20%
Token generation efficiency gain	15%

Quick facts

Maker	OpenAI
Models repriced	GPT-5.6 Luna, GPT-5.6 Terra
Luna price	$0.20 / 1M in · $1.20 / 1M out (was $1 / $6)
Terra price	$2 / 1M in · $12 / 1M out (was $2.50 / $15)
Sol price	Unchanged
Effective date	July 30, 2026
How they cut it	20% lower serving cost, 15% better token efficiency

Pricing

GPT-5.6 Luna — input · was $1	$0.20 / 1M tokens
GPT-5.6 Luna — output · was $6	$1.20 / 1M tokens
GPT-5.6 Terra — input · was $2.50	$2.00 / 1M tokens
GPT-5.6 Terra — output · was $15	$12.00 / 1M tokens

source ↗

What is it?

GPT-5.6 Luna is now $0.20 per million input tokens and $1.20 per million output tokens on the OpenAI API — an 80% cut. GPT-5.6 Terra, the balanced tier, drops to $2 in / $12 out — 20% cheaper. Sol, the flagship, keeps its old price. All three ship as part of the GPT-5.6 family that OpenAI launched July 9, 2026.

How does it work?

OpenAI attributes the cut to infrastructure work done since launch: the company says end-to-end serving costs for the GPT-5.6 family fell 20% and token-generation efficiency climbed more than 15%. Those gains land on the two cheaper tiers first — Luna at 80% off, Terra at 20% off — with Sol pricing held so the flagship keeps funding continued frontier training.

Why does it matter?

At $0.20 / $1.20, GPT-5.6 Luna is now cheaper than most open-weight-hosted models on OpenRouter and clearly undercuts Anthropic's Haiku 4.5 and Google's Gemini 3.6 Flash on paper. That reshapes the cheap-tier pricing race: high-throughput classifiers, routers, and background workflows that were the natural home of open-source models suddenly have a hosted OpenAI option at a similar unit cost.

Who is it for?

API builders running high-volume, cost-sensitive workloads on Luna or Terra

Frequently asked questions

How much does GPT-5.6 Luna cost now?: GPT-5.6 Luna now costs $0.20 per million input tokens and $1.20 per million output tokens on the OpenAI API, down from $1 and $6 — an 80% price cut. It is OpenAI's fastest and cheapest model in the GPT-5.6 family and is meant for high-throughput classification, routing, and small edits.
How much does GPT-5.6 Terra cost now?: GPT-5.6 Terra is now $2 per million input tokens and $12 per million output tokens, down from $2.50 and $15 — a 20% cut. Terra is OpenAI's balanced GPT-5.6 tier, priced to sit between the cheap Luna and the flagship Sol tier while keeping GPT-5.5-class quality.
Did GPT-5.6 Sol get cheaper too?: No. OpenAI kept GPT-5.6 Sol pricing unchanged on July 30, 2026. Only Luna and Terra were repriced. Sol Ultra with max reasoning stays at the top of OpenAI's coding-agent leaderboard and still costs less than half of Claude Fable 5 on the Artificial Analysis Coding Agent Index, per OpenAI.
Why is OpenAI cutting GPT-5.6 prices so soon after launch?: OpenAI said serving-cost improvements dropped the end-to-end cost of running the GPT-5.6 family by 20% and lifted token-generation efficiency by more than 15% in the three weeks since launch. The company is passing those gains on to Luna and Terra customers to expand adoption on cheaper tiers.
When does the new GPT-5.6 pricing take effect?: The new GPT-5.6 Luna and Terra prices are live on the OpenAI API pricing page as of July 30, 2026 — the same day OpenAI announced the cut. No opt-in or contract change is required; every API call from that day forward is metered at the lower rate.

Try it

gpt-5-6-luna and gpt-5-6-terra on the OpenAI API — new prices billed automatically