GPT 5.6 Luna
OpenAI · text, image → text
GPT-5.6 Luna is designed for cost-sensitive, high-volume workloads. It roughly corresponds to the nano model tier used in earlier GPT-5 families.
Input$0.2 /M
Output$1.2 /M
Cache read$0.02 /M
← ModelsGPT 5.6 LunaO3 Pro
GPT 5.6 Luna vs O3 Pro
Compare GPT 5.6 Luna from OpenAI and O3 Pro from OpenAI on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the AIHubMix API.
GPT 5.6 LunaO3 Pro+ Add model · 2/4
O3 Pro
OpenAI · text, image → text
o3-pro This model only supports Requests API interface requests.The model's thinking time is relatively long, so the response will be slow.
Input$20 /M
Output$80 /M
Pricing & Specifications
Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.
GPT 5.6 Luna
O3 Pro
Input /M
$0.2
$20
Output /M
$1.2
$80
Cache read /M
$0.02
-
Context length
1,050,000
200,000
Max output
128,000
100,000
Time to First Token
5.1 s
88.9 s
Throughput
47.6 tok/s
12.6 tok/s
Modalities
textimage
textimage
Supported Parameters
toolsthinkingstructured outputs
thinkingtoolsfunction callingstructured outputs
API Formats
chat_completions · responses
Released
July 9, 2026
June 10, 2025
Promotional prices show the discounted rate; see each model page for promotion windows.
Activity Past 30 Days
Daily traffic served through AIHubMix — how demand for each model is trending.
gpt-5.6-lunao3-pro
Tokens / day
-
Requests / day
-
Performance Past 3 Days
Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.
gpt-5.6-lunao3-pro
Throughput (tok/s)
-
TTFT (s)
-
Uptime (%)
-
Cost calculator
Estimate your monthly bill for the same workload on each model.
GPT 5.6 Luna
$30.00 /mo
O3 Pro
$2,400 /mo
Monthly = daily × 30. Discounted rates applied where a promotion is active.
FAQ
Which is cheaper: GPT 5.6 Luna, O3 Pro?
GPT 5.6 Luna: $1.2/M output tokens; O3 Pro: $80/M. Use the cost calculator above to estimate your own workload.
Which responds faster?
GPT 5.6 Luna: 5.1s time to first token measured on AIHubMix; see the live performance charts above for how each model behaves across the day.
How large is each context window?
GPT 5.6 Luna accepts 1,050,000 and O3 Pro accepts 200,000 input tokens. Maximum output per request is 128,000 tokens on GPT 5.6 Luna and 100,000 tokens on O3 Pro.
Which one generates tokens faster?
GPT 5.6 Luna at 47.6 tok/s and O3 Pro at 12.6 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.
What inputs and capabilities does each model support?
GPT 5.6 Luna accepts text and image input and supports tool calling, thinking and structured outputs; O3 Pro accepts text and image input and supports thinking, tool calling, function calling and structured outputs.
Can I call GPT 5.6 Luna and O3 Pro with the same API key?
Yes. AIHubMix serves every model on this page behind one OpenAI-compatible endpoint, so switching between them is a one-line change to the model field — no second account, key or SDK.
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