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$1 /M
Output$6 /M
Cache read$0.1 /M
← ModelsGPT 5.6 LunaO4 Mini
GPT 5.6 Luna vs O4 Mini
Compare GPT 5.6 Luna from OpenAI and O4 Mini 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 LunaO4 Mini+ Add model · 2/4
O4 Mini
OpenAI · text, image, pdf → text
o4-mini is a remarkably smart model for its speed and cost-efficiency. This allows it to support significantly higher usage limits than o3, making it a strong high-volume, high-throughput option for everyone with questions that benefit from reasoning.
Input$1.1 /M
Output$4.4 /M
Cache read$0.275 /M
Pricing & Specifications
Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.
GPT 5.6 Luna
O4 Mini
Input /M
$1
$1.1
Output /M
$6
$4.4
Cache read /M
$0.1
$0.275
Context length
1,050,000
200,000
Max output
128,000
100,000
Time to First Token
2.2 s
5.8 s
Throughput
88.4 tok/s
43.5 tok/s
Modalities
textimage
textimagepdf
Supported Parameters
toolsthinkingstructured outputs
thinkingtoolfunction callingstructured outputs
API Formats
chat_completions · responses
Released
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-
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-lunao4-mini
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-lunao4-mini
Throughput (tok/s)
-
TTFT (s)
-
Uptime (%)
-
Cost calculator
Estimate your monthly bill for the same workload on each model.
O4 Mini
$132 /mo
GPT 5.6 Luna
$150 /mo
Monthly = daily × 30. Discounted rates applied where a promotion is active.
FAQ
Which is cheaper: GPT 5.6 Luna, O4 Mini?
O4 Mini: $4.4/M output tokens; GPT 5.6 Luna: $6/M. Use the cost calculator above to estimate your own workload.
Which responds faster?
GPT 5.6 Luna: 2.2s 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 O4 Mini accepts 200,000 input tokens. Maximum output per request is 128,000 tokens on GPT 5.6 Luna and 100,000 tokens on O4 Mini.
Which one generates tokens faster?
GPT 5.6 Luna at 88.4 tok/s and O4 Mini at 43.5 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; O4 Mini accepts text, image and PDF input and supports thinking, tool calling, function calling and structured outputs.
Can I call GPT 5.6 Luna and O4 Mini 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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