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 Lunagpt-oss-120b
GPT 5.6 Luna vs gpt-oss-120b
Compare GPT 5.6 Luna from OpenAI and gpt-oss-120b 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-oss-120b+ Add model · 2/4
gpt-oss-120b
OpenAI · text → text
gpt-oss-120b is a 117B-parameter open-weight Mixture-of-Experts (MoE) language model from OpenAI, designed for high-reasoning, agentic, and general-purpose production use cases. Activating just 5.1B parameters per pass, it is optimized to run on a single H100 GPU with native MXFP4 quantization. The model features configurable reasoning depth, full chain-of-thought access, and native tool use, including function calling, browsing, and structured output generation.
Input$0.18 /M
Output$0.9 /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-oss-120b
Input /M
$0.2
$0.18
Output /M
$1.2
$0.9
Cache read /M
$0.02
-
Context length
1,050,000
131,072
Max output
128,000
32,768
Time to First Token
4.8 s
0.1 s
Throughput
45.3 tok/s
1101.0 tok/s
Modalities
textimage
text
Supported Parameters
toolsthinkingstructured outputs
thinkingfunction callingstructured outputs
API Formats
chat_completions · responses
Released
July 9, 2026
August 5, 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-lunagpt-oss-120b
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-oss-120b
Throughput (tok/s)
-
TTFT (s)
-
Uptime (%)
-
Cost calculator
Estimate your monthly bill for the same workload on each model.
gpt-oss-120b
$24.30 /mo
GPT 5.6 Luna
$30.00 /mo
Monthly = daily × 30. Discounted rates applied where a promotion is active.
FAQ
Which is cheaper: GPT 5.6 Luna, gpt-oss-120b?
gpt-oss-120b: $0.9/M output tokens; GPT 5.6 Luna: $1.2/M. Use the cost calculator above to estimate your own workload.
Which responds faster?
gpt-oss-120b: 0.1s 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 gpt-oss-120b accepts 131,072 input tokens. Maximum output per request is 128,000 tokens on GPT 5.6 Luna and 32,768 tokens on gpt-oss-120b.
Which one generates tokens faster?
gpt-oss-120b at 1101.0 tok/s and GPT 5.6 Luna at 45.3 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; gpt-oss-120b accepts text input and supports thinking, function calling and structured outputs.
Can I call GPT 5.6 Luna and gpt-oss-120b 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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