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 Luna
grok-4-1-fast-non-reasoning
GPT 5.6 Luna vs grok-4-1-fast-non-reasoning
Compare GPT 5.6 Luna from OpenAI and grok-4-1-fast-non-reasoning from Grok 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 Lunagrok-4-1-fast-non-reasoning+ Add model · 2/4
grok-4-1-fast-non-reasoning
Grok · text, image → text
grok-4-1-fast-non-reasoning
Input$0.2 /M
Output$0.5 /M
Cache read$0.05 /M
Pricing & Specifications
Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.
GPT 5.6 Luna
grok-4-1-fast-non-reasoning
Input /M
$1
$0.2
Output /M
$6
$0.5
Cache read /M
$0.1
$0.05
Context length
1,050,000
1,000,000
Max output
128,000
2,000,000
Time to First Token
2.2 s
-
Throughput
88.4 tok/s
-
Modalities
textimage
textimage
Supported Parameters
toolsthinkingstructured outputs
thinkingtoolsfunction callingstructured 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-lunagrok-4-1-fast-non-reasoning
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-lunagrok-4-1-fast-non-reasoning
Throughput (tok/s)
-
TTFT (s)
-
Uptime (%)
-
Cost calculator
Estimate your monthly bill for the same workload on each model.
grok-4-1-fast-non-reasoning
$19.50 /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, grok-4-1-fast-non-reasoning?
grok-4-1-fast-non-reasoning: $0.5/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 grok-4-1-fast-non-reasoning accepts 1,000,000 input tokens. Maximum output per request is 128,000 tokens on GPT 5.6 Luna and 2,000,000 tokens on grok-4-1-fast-non-reasoning.
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; grok-4-1-fast-non-reasoning accepts text and image input and supports thinking, tool calling, function calling and structured outputs.
Can I call GPT 5.6 Luna and grok-4-1-fast-non-reasoning 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.
Popular comparisons
Related model match-ups readers also look at.
