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$0.20 /M
Output$1.20 /M
← Modelsgpt-5.6-luna
grok-4.5
gpt-5.6-luna vs grok-4.5
Output tokens cost $1.20 per million on gpt-5.6-luna and $6.00 per million on grok-4.5. Input tokens cost $0.20 per million on gpt-5.6-luna and $2.00 per million on grok-4.5. Cached input tokens are billed at $0.02 per million on gpt-5.6-luna and $0.50 per million on grok-4.5. Context windows are 1,050,000 tokens on gpt-5.6-luna and 1,000,000 tokens on grok-4.5. First-token latency measured on AIHubMix is 3.1s on gpt-5.6-luna and 1.8s on grok-4.5. Measured output throughput is 93.6 tokens/s on gpt-5.6-luna and 38.4 tokens/s on grok-4.5.
gpt-5.6-lunagrok-4.5+ Add model 2/4
grok-4.5
Grok · text, image → text
Grok 4.5 was trained on datasets spanning knowledge in coding, science, engineering, and math. With both intelligent and efficient reasoning, Grok 4.5 excels at real engineering tasks and exceeds comparable leading models at these tasks.
Input$2.00 /M
Output$6.00 /M
Specs & Pricing
Prices are per million tokens. Latency and throughput are rolling averages measured on AIHubMix.
gpt-5.6-luna
grok-4.5
Input price
$0.20
$2.00
Output price
$1.20
$6.00
Cache read
$0.02
$0.50
Context window
1,050,000
1,000,000
Max output
128,000
1,000,000
Latency (first token)
3.1 s
1.8 s
Throughput
93.6 TPS
38.4 TPS
Modalities
textimage
textimage
Features
toolsthinkingstructured outputs
thinkingtoolsfunction callingstructured outputslong context
Endpoints
chat_completions · responses
Promotional prices show the discounted rate; see each model page for promotion windows.
Usage on AIHubMix last 30 days
Daily traffic served through AIHubMix — how demand for each model is trending.
gpt-5.6-lunagrok-4.5
Tokens / day
-
Requests / day
-
Live Performance last 3 days
Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.
gpt-5.6-lunagrok-4.5
Throughput (TPS)
-
Latency (s)
-
Uptime (%)
-
Cost Calculator
Estimate your monthly bill for the same workload on each model.
gpt-5.6-luna
$30.00 /mo
grok-4.5
$210 /mo
Monthly = daily × 30. Discounted rates applied where a promotion is active.
FAQ
Which is cheaper: gpt-5.6-luna, grok-4.5?
gpt-5.6-luna: $1.20/M output tokens; grok-4.5: $6.00/M. Use the cost calculator above to estimate your own workload.
Which responds faster?
grok-4.5: 1.8s first-token latency 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 grok-4.5 accepts 1,000,000 input tokens. Maximum output per request is 128,000 tokens on gpt-5.6-luna and 1,000,000 tokens on grok-4.5.
Which one generates tokens faster?
gpt-5.6-luna at 93.6 tokens/s and grok-4.5 at 38.4 tokens/s, measured as output throughput on AIHubMix — a separate metric from first-token latency.
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-4.5 accepts text and image input and supports thinking, tool calling, function calling, structured outputs and long context.
Can I call gpt-5.6-luna and grok-4.5 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.
AIHubMix