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 LunaSolar Pro4
GPT 5.6 Luna vs Solar Pro4
Compare GPT 5.6 Luna from OpenAI and Solar Pro4 from Upstage 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 LunaSolar Pro4+ Add model · 2/4
Solar Pro4
Upstage · text → text
Solar Pro 4 is Upstage's cost-efficient large language model, designed for long-horizon tasks, agentic workflows, and document-intensive office productivity. It features an extensive 524,288-token context window alongside robust reasoning and tool calling capabilities.
Input$0.3 /M
Output$1.2 /M
Cache read$0.06 /M
Pricing & Specifications
Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.
GPT 5.6 Luna
Solar Pro4
Input /M
$1
$0.3
Output /M
$6
$1.2
Cache read /M
$0.1
$0.06
Context length
1,050,000
524,288
Max output
128,000
0
Time to First Token
2.2 s
-
Throughput
88.4 tok/s
-
Modalities
textimage
text
Supported Parameters
toolsthinkingstructured outputs
reasoningtool callinglong context
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-lunasolar-pro4
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-lunasolar-pro4
Throughput (tok/s)
-
TTFT (s)
-
Uptime (%)
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Cost calculator
Estimate your monthly bill for the same workload on each model.
Solar Pro4
$36.00 /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, Solar Pro4?
Solar Pro4: $1.2/M output tokens; GPT 5.6 Luna: $6/M. Use the cost calculator above to estimate your own workload.
How large is each context window?
GPT 5.6 Luna accepts 1,050,000 and Solar Pro4 accepts 524,288 input tokens.
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; Solar Pro4 accepts text input and supports reasoning, tool calling and long context.
Can I call GPT 5.6 Luna and Solar Pro4 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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