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GPT 5.2 vs GPT 5.6 Luna

Compare GPT 5.2 from OpenAI and GPT 5.6 Luna 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.

OpenAIGPT 5.2OpenAIGPT 5.6 Luna
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GPT 5.2
OpenAI · text, image, pdf → text

GPT-5.2 is an advanced general-purpose model that improves on GPT-5.1 with more reliable, flexible, and user-friendly interactions. It delivers clearer responses, stronger instruction-following, and adaptive reasoning that scales from simple requests to complex, multi-step tasks. With enhanced control over tone and structure and support for extended context, GPT-5.2 is well suited for agent workflows, analysis, coding, and cross-domain applications.

Input$1.75 /M
Output$14 /M
Cache read$0.175 /M
Details
OpenAI logo
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
Details

Pricing & Specifications

Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.

GPT 5.2
GPT 5.6 Luna
Input /M
$1.75
$0.2
Output /M
$14
$1.2
Cache read /M
$0.175
$0.02
Context length
400,000
1,050,000
Max output
128,000
128,000
Time to First Token
1.4 s
5.0 s
Throughput
58.1 tok/s
47.2 tok/s
Modalities
textimagepdf
textimage
Supported Parameters
thinkingfunction callingstructured outputswebtools
toolsthinkingstructured outputs
API Formats
chat_completions · responses
Released
December 11, 2025
July 9, 2026

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-5.2gpt-5.6-luna

Tokens / day

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Requests / day

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Performance Past 3 Days

Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.

gpt-5.2gpt-5.6-luna

Throughput (tok/s)

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TTFT (s)

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Uptime (%)

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Cost calculator

Estimate your monthly bill for the same workload on each model.

GPT 5.6 Luna
$30.00 /mo
GPT 5.2
$315 /mo

Monthly = daily × 30. Discounted rates applied where a promotion is active.

FAQ

Which is cheaper: GPT 5.2, GPT 5.6 Luna?

GPT 5.6 Luna: $1.2/M output tokens; GPT 5.2: $14/M. Use the cost calculator above to estimate your own workload.

Which responds faster?

GPT 5.2: 1.4s 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 5.2 accepts 400,000 and GPT 5.6 Luna accepts 1,050,000 input tokens. Maximum output per request is 128,000 tokens on GPT 5.2 and 128,000 tokens on GPT 5.6 Luna.

Which one generates tokens faster?

GPT 5.2 at 58.1 tok/s and GPT 5.6 Luna at 47.2 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 5.2 accepts text, image and PDF input and supports thinking, function calling, structured outputs, web search and tool calling; GPT 5.6 Luna accepts text and image input and supports tool calling, thinking and structured outputs.

Can I call GPT 5.2 and GPT 5.6 Luna 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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