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GPT 5.6 Luna (Fast)

openai·openai/gpt-5.6-luna-fast·GA·Closed·gpt-luna series·NEW
Cost-efficient GPT-5.6 model for fast, high-volume workloads

Specs & pricing

Input / output per 1M tokens
Reference price·Vercel AI Gateway
$0.40 / $2.40
Blended $0.90 · Cache read $0.04
Lowest paid·Vercel AI GatewayCloud
$0.40 / $2.40
Blended $0.90
Context
1,050,000
Output limit
128,000
Knowledge cutoff
2026-02-16
Released / updated
2026-07-09 / 2026-07-09
Capabilities
✓ Reasoning✓ Tool use✓ Structured outputTemperature✓ Attachments
Modalities
TextImagePDF

Available at 1 providers1 with public prices

ProviderTierInputOutputCache readCache writeContextOutput limitStatus
Vercel AI GatewayCloud$0.40
tiered >272K: $0.80
$2.40$0.04$0.501,050,000128,000

Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.

Reasoning control

effort = noneeffort = loweffort = mediumeffort = higheffort = xhigheffort = max

Your usage cost

1Vercel AI Gateway$156.80
The cheapest paid channel is the only channel.

Price historyone sample accumulated per data sync

Input list $0.40Output list $2.40Min blended $0.90

Price history accumulates from each data sync; currently only 1 sample(s) (2026-08-19). Each future sync adds a point, and once accumulated a line is drawn here.

Related models

GPT-6 Lunasame series$0.10 / $0.50Agentic Chat (GPT-6 Luna)same series$0 / $0GPT-6 Luna (EU)same series$0.12 / $0.60GLM-5.3-Flashcheaper alternative$0.15 / $0.50DeepSeek V4.1 Flashcheaper alternative$0.15 / $0.60GPT-5.6 Lunacheaper alternative$0.20 / $1.20Qwen3.8 Flashcheaper alternative$0.15 / $0.47
Data partly from models.dev (MIT) · Vercel AI Gateway official docs ↗