Flagship — best answers, highest costCommercial API

GPT-5.6 Luna Pricing

OpenAI · openai-gpt-5-6-luna

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Input / 1M tokens

$1.00

Output / 1M tokens

$6.00

Context window

1050k tokens

≈ 1,400 pages of text

Max output

128k tokens

What it costs in practice

Typical request (1,200 in + 400 out tokens)$0.0036

1,000 requests / month$3.60/mo 10,000 requests / month$36.00/mo 100,000 requests / month$360.00/mo

Estimate your own workloadOpens the calculator with GPT-5.6 Luna preloaded — adjust volume and token counts there.

Price history

List price per 1M tokens since we started tracking in Jul 2026. The lines are flat because the price hasn't changed since then.

What it excels at

Processes 1M-token contexts for large-scale document, codebase, and multimodal analysis. Supports extended output sequences up to 128k tokens.

The business tradeoff

Available only via commercial API with no open weights or local hosting. Output pricing at $6 per million tokens increases cost for generation-heavy workloads.

Cheaper from OpenAI

GPT-5.4 MiniOpenAI$0.0027/ typical request GPT-5.4 NanoOpenAI$0.0007/ typical request

Same tier from other providers

Claude Fable 5Anthropic$0.032/ typical request Qwen3.7 PlusQwen$0.0009/ typical request Grok 4.3xAI$0.0025/ typical request

Head-to-head

GPT-5.6 Luna vs Claude Fable 5 →GPT-5.6 Luna vs Qwen3.7 Plus →GPT-5.6 Luna vs Grok 4.3 →

Vendor list rates, as of Jul 9, 2026 · source: openrouter · per-request examples assume 1,200 input + 400 output tokens.