Flagship — best answers, highest costCommercial API

GPT-6 Luna Pricing

OpenAI · openai-gpt-6-luna

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Input / 1M tokens

$0.100

Output / 1M tokens

$0.500

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)$0.0003

1,000 requests / month$0.32/mo 10,000 requests / month$3.20/mo 100,000 requests / month$32.00/mo

Estimate your own workloadOpens the calculator with GPT-6 Luna preloaded — adjust volume and token counts there.

Price history

Only one price point recorded so far.

The staircase chart appears once a price change is detected.

What it excels at

Excels at long-context document analysis and extended multi-step reasoning chains, supported by 1M-token context and 128k output at low per-token cost.

The business tradeoff

Commercial API access creates dependency on provider uptime and rate limits; output pricing at $0.5/M may accumulate rapidly on high-volume generation workloads.

Cheaper from OpenAI

GPT-6 Luna Pro (batch)OpenAI$0.0002/ typical request GPT-6 Luna (batch)OpenAI$0.0002/ typical request gpt-oss-20bOpenAI$0.0001/ 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-6 Luna vs Claude Fable 5 →GPT-6 Luna vs Qwen3.7 Plus →GPT-6 Luna vs Grok 4.3 →

Vendor list rates, as of Sep 22, 2026 · source: openrouter · per-request examples assume 1,200 input + 400 output tokens.