How much does GPT-5.6 Luna cost?

GPT-5.6 Luna costs $0.2 per 1 million input tokens and $1.2 per 1 million output tokens. This pricing is set by OpenAI.

What tokenizer does GPT-5.6 Luna use?

GPT-5.6 Luna uses the o200k_base tokenizer. This is OpenAI's latest tokenizer, optimized for efficiency with a vocabulary of ~200,000 tokens.

What is GPT-5.6 Luna's context window?

GPT-5.6 Luna supports a context window of 1.1M tokens (1,050,000 tokens). The maximum output length is 128K tokens.

How does GPT-5.6 Luna compare to other models?

You can compare GPT-5.6 Luna's pricing and capabilities against other LLMs in the comparison table above, or visit the full pricing page for a side-by-side view of all models.

How do I count tokens for GPT-5.6 Luna?

Use the token counter at the top of this page or visit the homepage calculator. Paste your text and it will show the exact token count and cost for GPT-5.6 Luna using the o200k_base tokenizer.

GPT-5.6 Luna

Last verified August 9, 2026 · OpenAI pricing ↗

$0.200/1M input · $1.20/1M output · 1.1M context · OpenAI

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Pricing Details

OpenAICheapest, fastest tier of the GPT-5.6 family, for routine latency- and cost-sensitive traffic. Price cut 80% on 2026-07-30 from $1.00/$6.00; every line fell by exactly 5x. Cached input: $0.02/1M. Batch and Flex: $0.10/$0.60. Fast mode (Priority Processing renamed 2026-07-30; both service_tier values still work): $0.40 input / $0.04 cached / $2.40 output, a flat 2x. Carries the highest published latency floor in the family, 99% of requests above 100 output tok/s, against Sol Fast's 80 despite costing 25x less on output. Above 272K input tokens the whole request bills at 2x input / 1.5x output ($0.40/$1.80). CHANGED 2026-08-05: Fast mode now accepts long-context prompts, and the pricing page publishes Fast long context at $0.80 input / $0.08 cached / $3.60 output. Batch/Flex long context: $0.20/$0.90. Now lists below OpenAI's own GPT-5.4 Nano ($0.20/$1.25). Knowledge cutoff Feb 16, 2026. Chat Completions and Batch only; no realtime, fine-tuning or embeddings. Artificial Analysis (max reasoning effort): Intelligence Index 51, 130M output tokens and $190.87 to run the index, 184.4 tok/s, 116.50s TTFT. Rates confirmed on OpenAI's own pricing page (verified 2026-07-31).

Input / 1M tokens

$0.2

Output / 1M tokens

$1.2

Context Window

1.1M

Max Output

128K

Full Pricing Table Token Calculator

Price History

No price change recorded since 2026-08-09, when this site started tracking this model; it launched on 2026-06-26.

Frequently Asked Questions

Common questions about GPT-5.6 Luna pricing and usage