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 LunaGPT 6 Astra
GPT 5.6 Luna vs GPT 6 Astra
Compare GPT 5.6 Luna from OpenAI and GPT 6 Astra 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 LunaGPT 6 Astra+ Add model · 2/4
GPT 6 Astra
OpenAI · text, image → text
GPT-5.6 Terra is designed for workloads that balance intelligence and cost. It roughly corresponds to the mini model tier used in earlier GPT-5 families.
Input$2.5 /M
Output$15 /M
Cache read$0.25 /M
Pricing & Specifications
Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.
GPT 5.6 Luna
GPT 6 Astra
Input /M
$1
$2.5
Output /M
$6
$15
Cache read /M
$0.1
$0.25
Context length
1,050,000
1,050,000
Max output
128,000
128,000
Time to First Token
2.2 s
-
Throughput
88.4 tok/s
-
Modalities
textimage
textimage
Supported Parameters
toolsthinkingstructured outputs
API Formats
chat_completions · responses
Released
-
-
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-lunagpt-6-astra
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-lunagpt-6-astra
Throughput (tok/s)
-
TTFT (s)
-
Uptime (%)
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Cost calculator
Estimate your monthly bill for the same workload on each model.
GPT 5.6 Luna
$150 /mo
GPT 6 Astra
$375 /mo
Monthly = daily × 30. Discounted rates applied where a promotion is active.
FAQ
Which is cheaper: GPT 5.6 Luna, GPT 6 Astra?
GPT 5.6 Luna: $6/M output tokens; GPT 6 Astra: $15/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 GPT 6 Astra accepts 1,050,000 input tokens. Maximum output per request is 128,000 tokens on GPT 5.6 Luna and 128,000 tokens on GPT 6 Astra.
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; GPT 6 Astra accepts text and image input.
Can I call GPT 5.6 Luna and GPT 6 Astra 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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